""" Provides various throttling policies. """ from __future__ import unicode_literals from django.core.cache import cache as default_cache from django.core.exceptions import ImproperlyConfigured from rest_framework.settings import api_settings import time class BaseThrottle(object): """ Rate throttling of requests. """ def allow_request(self, request, view): """ Return `True` if the request should be allowed, `False` otherwise. """ raise NotImplementedError('.allow_request() must be overridden') def get_ident(self, request): """ Identify the machine making the request by parsing HTTP_X_FORWARDED_FOR if present and number of proxies is > 0. If not use all of HTTP_X_FORWARDED_FOR if it is available, if not use REMOTE_ADDR. """ xff = request.META.get('HTTP_X_FORWARDED_FOR') remote_addr = request.META.get('REMOTE_ADDR') num_proxies = api_settings.NUM_PROXIES if num_proxies is not None: if num_proxies == 0 or xff is None: return remote_addr addrs = xff.split(',') client_addr = addrs[-min(num_proxies, len(xff))] return client_addr.strip() return xff if xff else remote_addr def wait(self): """ Optionally, return a recommended number of seconds to wait before the next request. """ return None class SimpleRateThrottle(BaseThrottle): """ A simple cache implementation, that only requires `.get_cache_key()` to be overridden. The rate (requests / seconds) is set by a `throttle` attribute on the View class. The attribute is a string of the form 'number_of_requests/period'. Period should be one of: ('s', 'sec', 'm', 'min', 'h', 'hour', 'd', 'day') Previous request information used for throttling is stored in the cache. """ cache = default_cache timer = time.time cache_format = 'throttle_%(scope)s_%(ident)s' scope = None THROTTLE_RATES = api_settings.DEFAULT_THROTTLE_RATES def __init__(self): if not getattr(self, 'rate', None): self.rate = self.get_rate() self.num_requests, self.duration = self.parse_rate(self.rate) def get_cache_key(self, request, view): """ Should return a unique cache-key which can be used for throttling. Must be overridden. May return `None` if the request should not be throttled. """ raise NotImplementedError('.get_cache_key() must be overridden') def get_rate(self): """ Determine the string representation of the allowed request rate. """ if not getattr(self, 'scope', None): msg = ("You must set either `.scope` or `.rate` for '%s' throttle" % self.__class__.__name__) raise ImproperlyConfigured(msg) try: return self.THROTTLE_RATES[self.scope] except KeyError: msg = "No default throttle rate set for '%s' scope" % self.scope raise ImproperlyConfigured(msg) def parse_rate(self, rate): """ Given the request rate string, return a two tuple of: , """ if rate is None: return (None, None) num, period = rate.split('/') num_requests = int(num) duration = {'s': 1, 'm': 60, 'h': 3600, 'd': 86400}[period[0]] return (num_requests, duration) def allow_request(self, request, view): """ Implement the check to see if the request should be throttled. On success calls `throttle_success`. On failure calls `throttle_failure`. """ if self.rate is None: return True self.key = self.get_cache_key(request, view) if self.key is None: return True self.history = self.cache.get(self.key, []) self.now = self.timer() # Drop any requests from the history which have now passed the # throttle duration while self.history and self.history[-1] <= self.now - self.duration: self.history.pop() if len(self.history) >= self.num_requests: return self.throttle_failure() return self.throttle_success() def throttle_success(self): """ Inserts the current request's timestamp along with the key into the cache. """ self.history.insert(0, self.now) self.cache.set(self.key, self.history, self.duration) return True def throttle_failure(self): """ Called when a request to the API has failed due to throttling. """ return False def wait(self): """ Returns the recommended next request time in seconds. """ if self.history: remaining_duration = self.duration - (self.now - self.history[-1]) else: remaining_duration = self.duration available_requests = self.num_requests - len(self.history) + 1 if available_requests <= 0: return None return remaining_duration / float(available_requests) class AnonRateThrottle(SimpleRateThrottle): """ Limits the rate of API calls that may be made by a anonymous users. The IP address of the request will be used as the unique cache key. """ scope = 'anon' def get_cache_key(self, request, view): if request.user.is_authenticated(): return None # Only throttle unauthenticated requests. ident = request.META.get('HTTP_X_FORWARDED_FOR') if ident is None: ident = request.META.get('REMOTE_ADDR') else: ident = ''.join(ident.split()) return self.cache_format % { 'scope': self.scope, 'ident': self.get_ident(request) } class UserRateThrottle(SimpleRateThrottle): """ Limits the rate of API calls that may be made by a given user. The user id will be used as a unique cache key if the user is authenticated. For anonymous requests, the IP address of the request will be used. """ scope = 'user' def get_cache_key(self, request, view): if request.user.is_authenticated(): ident = request.user.id else: ident = self.get_ident(request) return self.cache_format % { 'scope': self.scope, 'ident': ident } class ScopedRateThrottle(SimpleRateThrottle): """ Limits the rate of API calls by different amounts for various parts of the API. Any view that has the `throttle_scope` property set will be throttled. The unique cache key will be generated by concatenating the user id of the request, and the scope of the view being accessed. """ scope_attr = 'throttle_scope' def __init__(self): # Override the usual SimpleRateThrottle, because we can't determine # the rate until called by the view. pass def allow_request(self, request, view): # We can only determine the scope once we're called by the view. self.scope = getattr(view, self.scope_attr, None) # If a view does not have a `throttle_scope` always allow the request if not self.scope: return True # Determine the allowed request rate as we normally would during # the `__init__` call. self.rate = self.get_rate() self.num_requests, self.duration = self.parse_rate(self.rate) # We can now proceed as normal. return super(ScopedRateThrottle, self).allow_request(request, view) def get_cache_key(self, request, view): """ If `view.throttle_scope` is not set, don't apply this throttle. Otherwise generate the unique cache key by concatenating the user id with the '.throttle_scope` property of the view. """ if request.user.is_authenticated(): ident = request.user.id else: ident = self.get_ident(request) return self.cache_format % { 'scope': self.scope, 'ident': ident } 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 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from __future__ import unicode_literals
from django.db import models
from django.db.models.fields import BLANK_CHOICE_DASH
from django.test import TestCase
from django.utils.datastructures import MultiValueDict
from django.utils.translation import ugettext_lazy as _
from rest_framework import serializers, fields, relations
from rest_framework.tests.models import (HasPositiveIntegerAsChoice, Album, ActionItem, Anchor, BasicModel,
    BlankFieldModel, BlogPost, BlogPostComment, Book, CallableDefaultValueModel, DefaultValueModel,
    ManyToManyModel, Person, ReadOnlyManyToManyModel, Photo, RESTFrameworkModel)
from rest_framework.tests.models import BasicModelSerializer
import datetime
import pickle


class SubComment(object):
    def __init__(self, sub_comment):
        self.sub_comment = sub_comment


class Comment(object):
    def __init__(self, email, content, created):
        self.email = email
        self.content = content
        self.created = created or datetime.datetime.now()

    def __eq__(self, other):
        return all([getattr(self, attr) == getattr(other, attr)
                    for attr in ('email', 'content', 'created')])

    def get_sub_comment(self):
        sub_comment = SubComment('And Merry Christmas!')
        return sub_comment


class CommentSerializer(serializers.Serializer):
    email = serializers.EmailField()
    content = serializers.CharField(max_length=1000)
    created = serializers.DateTimeField()
    sub_comment = serializers.Field(source='get_sub_comment.sub_comment')

    def restore_object(self, data, instance=None):
        if instance is None:
            return Comment(**data)
        for key, val in data.items():
            setattr(instance, key, val)
        return instance


class NamesSerializer(serializers.Serializer):
    first = serializers.CharField()
    last = serializers.CharField(required=False, default='')
    initials = serializers.CharField(required=False, default='')


class PersonIdentifierSerializer(serializers.Serializer):
    ssn = serializers.CharField()
    names = NamesSerializer(source='names', required=False)


class BookSerializer(serializers.ModelSerializer):
    isbn = serializers.RegexField(regex=r'^[0-9]{13}$', error_messages={'invalid': 'isbn has to be exact 13 numbers'})

    class Meta:
        model = Book


class ActionItemSerializer(serializers.ModelSerializer):

    class Meta:
        model = ActionItem


class ActionItemSerializerCustomRestore(serializers.ModelSerializer):

    class Meta:
        model = ActionItem

    def restore_object(self, data, instance=None):
        if instance is None:
            return ActionItem(**data)
        for key, val in data.items():
            setattr(instance, key, val)
        return instance


class PersonSerializer(serializers.ModelSerializer):
    info = serializers.Field(source='info')

    class Meta:
        model = Person
        fields = ('name', 'age', 'info')
        read_only_fields = ('age',)


class NestedSerializer(serializers.Serializer):
    info = serializers.Field()


class ModelSerializerWithNestedSerializer(serializers.ModelSerializer):
    nested = NestedSerializer(source='*')

    class Meta:
        model = Person


class PersonSerializerInvalidReadOnly(serializers.ModelSerializer):
    """
    Testing for #652.
    """
    info = serializers.Field(source='info')

    class Meta:
        model = Person
        fields = ('name', 'age', 'info')
        read_only_fields = ('age', 'info')


class AlbumsSerializer(serializers.ModelSerializer):

    class Meta:
        model = Album
        fields = ['title']  # lists are also valid options


class PositiveIntegerAsChoiceSerializer(serializers.ModelSerializer):
    class Meta:
        model = HasPositiveIntegerAsChoice
        fields = ['some_integer']


class BasicTests(TestCase):
    def setUp(self):
        self.comment = Comment(
            'tom@example.com',
            'Happy new year!',
            datetime.datetime(2012, 1, 1)
        )
        self.data = {
            'email': 'tom@example.com',
            'content': 'Happy new year!',
            'created': datetime.datetime(2012, 1, 1),
            'sub_comment': 'This wont change'
        }
        self.expected = {
            'email': 'tom@example.com',
            'content': 'Happy new year!',
            'created': datetime.datetime(2012, 1, 1),
            'sub_comment': 'And Merry Christmas!'
        }
        self.person_data = {'name': 'dwight', 'age': 35}
        self.person = Person(**self.person_data)
        self.person.save()

    def test_empty(self):
        serializer = CommentSerializer()
        expected = {
            'email': '',
            'content': '',
            'created': None,
            'sub_comment': ''
        }
        self.assertEqual(serializer.data, expected)

    def test_retrieve(self):
        serializer = CommentSerializer(self.comment)
        self.assertEqual(serializer.data, self.expected)

    def test_create(self):
        serializer = CommentSerializer(data=self.data)
        expected = self.comment
        self.assertEqual(serializer.is_valid(), True)
        self.assertEqual(serializer.object, expected)
        self.assertFalse(serializer.object is expected)
        self.assertEqual(serializer.data['sub_comment'], 'And Merry Christmas!')

    def test_create_nested(self):
        """Test a serializer with nested data."""
        names = {'first': 'John', 'last': 'Doe', 'initials': 'jd'}
        data = {'ssn': '1234567890', 'names': names}
        serializer = PersonIdentifierSerializer(data=data)

        self.assertEqual(serializer.is_valid(), True)
        self.assertEqual(serializer.object, data)
        self.assertFalse(serializer.object is data)
        self.assertEqual(serializer.data['names'], names)

    def test_create_partial_nested(self):
        """Test a serializer with nested data which has missing fields."""
        names = {'first': 'John'}
        data = {'ssn': '1234567890', 'names': names}
        serializer = PersonIdentifierSerializer(data=data)

        expected_names = {'first': 'John', 'last': '', 'initials': ''}
        data['names'] = expected_names

        self.assertEqual(serializer.is_valid(), True)
        self.assertEqual(serializer.object, data)
        self.assertFalse(serializer.object is expected_names)
        self.assertEqual(serializer.data['names'], expected_names)

    def test_null_nested(self):
        """Test a serializer with a nonexistent nested field"""
        data = {'ssn': '1234567890'}
        serializer = PersonIdentifierSerializer(data=data)

        self.assertEqual(serializer.is_valid(), True)
        self.assertEqual(serializer.object, data)
        self.assertFalse(serializer.object is data)
        expected = {'ssn': '1234567890', 'names': None}
        self.assertEqual(serializer.data, expected)

    def test_update(self):
        serializer = CommentSerializer(self.comment, data=self.data)
        expected = self.comment
        self.assertEqual(serializer.is_valid(), True)
        self.assertEqual(serializer.object, expected)
        self.assertTrue(serializer.object is expected)
        self.assertEqual(serializer.data['sub_comment'], 'And Merry Christmas!')

    def test_partial_update(self):
        msg = 'Merry New Year!'
        partial_data = {'content': msg}
        serializer = CommentSerializer(self.comment, data=partial_data)
        self.assertEqual(serializer.is_valid(), False)
        serializer = CommentSerializer(self.comment, data=partial_data, partial=True)
        expected = self.comment
        self.assertEqual(serializer.is_valid(), True)
        self.assertEqual(serializer.object, expected)
        self.assertTrue(serializer.object is expected)
        self.assertEqual(serializer.data['content'], msg)

    def test_model_fields_as_expected(self):
        """
        Make sure that the fields returned are the same as defined
        in the Meta data
        """
        serializer = PersonSerializer(self.person)
        self.assertEqual(set(serializer.data.keys()),
                          set(['name', 'age', 'info']))

    def test_field_with_dictionary(self):
        """
        Make sure that dictionaries from fields are left intact
        """
        serializer = PersonSerializer(self.person)
        expected = self.person_data
        self.assertEqual(serializer.data['info'], expected)

    def test_read_only_fields(self):
        """
        Attempting to update fields set as read_only should have no effect.
        """
        serializer = PersonSerializer(self.person, data={'name': 'dwight', 'age': 99})
        self.assertEqual(serializer.is_valid(), True)
        instance = serializer.save()
        self.assertEqual(serializer.errors, {})
        # Assert age is unchanged (35)
        self.assertEqual(instance.age, self.person_data['age'])

    def test_invalid_read_only_fields(self):
        """
        Regression test for #652.
        """
        self.assertRaises(AssertionError, PersonSerializerInvalidReadOnly, [])


class DictStyleSerializer(serializers.Serializer):
    """
    Note that we don't have any `restore_object` method, so the default
    case of simply returning a dict will apply.
    """
    email = serializers.EmailField()


class DictStyleSerializerTests(TestCase):
    def test_dict_style_deserialize(self):
        """
        Ensure serializers can deserialize into a dict.
        """
        data = {'email': 'foo@example.com'}
        serializer = DictStyleSerializer(data=data)
        self.assertTrue(serializer.is_valid())
        self.assertEqual(serializer.data, data)

    def test_dict_style_serialize(self):
        """
        Ensure serializers can serialize dict objects.
        """
        data = {'email': 'foo@example.com'}
        serializer = DictStyleSerializer(data)
        self.assertEqual(serializer.data, data)


class ValidationTests(TestCase):
    def setUp(self):
        self.comment = Comment(
            'tom@example.com',
            'Happy new year!',
            datetime.datetime(2012, 1, 1)
        )
        self.data = {
            'email': 'tom@example.com',
            'content': 'x' * 1001,
            'created': datetime.datetime(2012, 1, 1)
        }
        self.actionitem = ActionItem(title='Some to do item',)

    def test_create(self):
        serializer = CommentSerializer(data=self.data)
        self.assertEqual(serializer.is_valid(), False)
        self.assertEqual(serializer.errors, {'content': ['Ensure this value has at most 1000 characters (it has 1001).']})

    def test_update(self):
        serializer = CommentSerializer(self.comment, data=self.data)
        self.assertEqual(serializer.is_valid(), False)
        self.assertEqual(serializer.errors, {'content': ['Ensure this value has at most 1000 characters (it has 1001).']})

    def test_update_missing_field(self):
        data = {
            'content': 'xxx',
            'created': datetime.datetime(2012, 1, 1)
        }
        serializer = CommentSerializer(self.comment, data=data)
        self.assertEqual(serializer.is_valid(), False)
        self.assertEqual(serializer.errors, {'email': ['This field is required.']})

    def test_missing_bool_with_default(self):
        """Make sure that a boolean value with a 'False' value is not
        mistaken for not having a default."""
        data = {
            'title': 'Some action item',
            #No 'done' value.
        }
        serializer = ActionItemSerializer(self.actionitem, data=data)
        self.assertEqual(serializer.is_valid(), True)
        self.assertEqual(serializer.errors, {})

    def test_cross_field_validation(self):

        class CommentSerializerWithCrossFieldValidator(CommentSerializer):

            def validate(self, attrs):
                if attrs["email"] not in attrs["content"]:
                    raise serializers.ValidationError("Email address not in content")
                return attrs

        data = {
            'email': 'tom@example.com',
            'content': 'A comment from tom@example.com',
            'created': datetime.datetime(2012, 1, 1)
        }

        serializer = CommentSerializerWithCrossFieldValidator(data=data)
        self.assertTrue(serializer.is_valid())

        data['content'] = 'A comment from foo@bar.com'

        serializer = CommentSerializerWithCrossFieldValidator(data=data)
        self.assertFalse(serializer.is_valid())
        self.assertEqual(serializer.errors, {'non_field_errors': ['Email address not in content']})

    def test_null_is_true_fields(self):
        """
        Omitting a value for null-field should validate.
        """
        serializer = PersonSerializer(data={'name': 'marko'})
        self.assertEqual(serializer.is_valid(), True)
        self.assertEqual(serializer.errors, {})

    def test_modelserializer_max_length_exceeded(self):
        data = {
            'title': 'x' * 201,
        }
        serializer = ActionItemSerializer(data=data)
        self.assertEqual(serializer.is_valid(), False)
        self.assertEqual(serializer.errors, {'title': ['Ensure this value has at most 200 characters (it has 201).']})

    def test_modelserializer_max_length_exceeded_with_custom_restore(self):
        """
        When overriding ModelSerializer.restore_object, validation tests should still apply.
        Regression test for #623.

        https://github.com/tomchristie/django-rest-framework/pull/623
        """
        data = {
            'title': 'x' * 201,
        }
        serializer = ActionItemSerializerCustomRestore(data=data)
        self.assertEqual(serializer.is_valid(), False)
        self.assertEqual(serializer.errors, {'title': ['Ensure this value has at most 200 characters (it has 201).']})

    def test_default_modelfield_max_length_exceeded(self):
        data = {
            'title': 'Testing "info" field...',
            'info': 'x' * 13,
        }
        serializer = ActionItemSerializer(data=data)
        self.assertEqual(serializer.is_valid(), False)
        self.assertEqual(serializer.errors, {'info': ['Ensure this value has at most 12 characters (it has 13).']})

    def test_datetime_validation_failure(self):
        """
        Test DateTimeField validation errors on non-str values.
        Regression test for #669.

        https://github.com/tomchristie/django-rest-framework/issues/669
        """
        data = self.data
        data['created'] = 0

        serializer = CommentSerializer(data=data)
        self.assertEqual(serializer.is_valid(), False)

        self.assertIn('created', serializer.errors)

    def test_missing_model_field_exception_msg(self):
        """
        Assert that a meaningful exception message is outputted when the model
        field is missing (e.g. when mistyping ``model``).
        """
        class BrokenModelSerializer(serializers.ModelSerializer):
            class Meta:
                fields = ['some_field']

        try:
            BrokenModelSerializer()
        except AssertionError as e:
            self.assertEqual(e.args[0], "Serializer class 'BrokenModelSerializer' is missing 'model' Meta option")
        except:
            self.fail('Wrong exception type thrown.')

    def test_writable_star_source_on_nested_serializer(self):
        """
        Assert that a nested serializer instantiated with source='*' correctly
        expands the data into the outer serializer.
        """
        serializer = ModelSerializerWithNestedSerializer(data={
            'name': 'marko',
            'nested': {'info': 'hi'}},
        )
        self.assertEqual(serializer.is_valid(), True)


class CustomValidationTests(TestCase):
    class CommentSerializerWithFieldValidator(CommentSerializer):

        def validate_email(self, attrs, source):
            attrs[source]
            return attrs

        def validate_content(self, attrs, source):
            value = attrs[source]
            if "test" not in value:
                raise serializers.ValidationError("Test not in value")
            return attrs

    def test_field_validation(self):
        data = {
            'email': 'tom@example.com',
            'content': 'A test comment',
            'created': datetime.datetime(2012, 1, 1)
        }

        serializer = self.CommentSerializerWithFieldValidator(data=data)
        self.assertTrue(serializer.is_valid())

        data['content'] = 'This should not validate'

        serializer = self.CommentSerializerWithFieldValidator(data=data)
        self.assertFalse(serializer.is_valid())
        self.assertEqual(serializer.errors, {'content': ['Test not in value']})

    def test_missing_data(self):
        """
        Make sure that validate_content isn't called if the field is missing
        """
        incomplete_data = {
            'email': 'tom@example.com',
            'created': datetime.datetime(2012, 1, 1)
        }
        serializer = self.CommentSerializerWithFieldValidator(data=incomplete_data)
        self.assertFalse(serializer.is_valid())
        self.assertEqual(serializer.errors, {'content': ['This field is required.']})

    def test_wrong_data(self):
        """
        Make sure that validate_content isn't called if the field input is wrong
        """
        wrong_data = {
            'email': 'not an email',
            'content': 'A test comment',
            'created': datetime.datetime(2012, 1, 1)
        }
        serializer = self.CommentSerializerWithFieldValidator(data=wrong_data)
        self.assertFalse(serializer.is_valid())
        self.assertEqual(serializer.errors, {'email': ['Enter a valid e-mail address.']})


class PositiveIntegerAsChoiceTests(TestCase):
    def test_positive_integer_in_json_is_correctly_parsed(self):
        data = {'some_integer': 1}
        serializer = PositiveIntegerAsChoiceSerializer(data=data)
        self.assertEqual(serializer.is_valid(), True)


class ModelValidationTests(TestCase):
    def test_validate_unique(self):
        """
        Just check if serializers.ModelSerializer handles unique checks via .full_clean()
        """
        serializer = AlbumsSerializer(data={'title': 'a'})
        serializer.is_valid()
        serializer.save()
        second_serializer = AlbumsSerializer(data={'title': 'a'})
        self.assertFalse(second_serializer.is_valid())
        self.assertEqual(second_serializer.errors,  {'title': ['Album with this Title already exists.']})

    def test_foreign_key_with_partial(self):
        """
        Test ModelSerializer validation with partial=True

        Specifically test foreign key validation.
        """

        album = Album(title='test')
        album.save()

        class PhotoSerializer(serializers.ModelSerializer):
            class Meta:
                model = Photo

        photo_serializer = PhotoSerializer(data={'description': 'test', 'album': album.pk})
        self.assertTrue(photo_serializer.is_valid())
        photo = photo_serializer.save()

        # Updating only the album (foreign key)
        photo_serializer = PhotoSerializer(instance=photo, data={'album': album.pk}, partial=True)
        self.assertTrue(photo_serializer.is_valid())
        self.assertTrue(photo_serializer.save())

        # Updating only the description
        photo_serializer = PhotoSerializer(instance=photo,
                                           data={'description': 'new'},
                                           partial=True)

        self.assertTrue(photo_serializer.is_valid())
        self.assertTrue(photo_serializer.save())


class RegexValidationTest(TestCase):
    def test_create_failed(self):
        serializer = BookSerializer(data={'isbn': '1234567890'})
        self.assertFalse(serializer.is_valid())
        self.assertEqual(serializer.errors, {'isbn': ['isbn has to be exact 13 numbers']})

        serializer = BookSerializer(data={'isbn': '12345678901234'})
        self.assertFalse(serializer.is_valid())
        self.assertEqual(serializer.errors, {'isbn': ['isbn has to be exact 13 numbers']})

        serializer = BookSerializer(data={'isbn': 'abcdefghijklm'})
        self.assertFalse(serializer.is_valid())
        self.assertEqual(serializer.errors, {'isbn': ['isbn has to be exact 13 numbers']})

    def test_create_success(self):
        serializer = BookSerializer(data={'isbn': '1234567890123'})
        self.assertTrue(serializer.is_valid())


class MetadataTests(TestCase):
    def test_empty(self):
        serializer = CommentSerializer()
        expected = {
            'email': serializers.CharField,
            'content': serializers.CharField,
            'created': serializers.DateTimeField
        }
        for field_name, field in expected.items():
            self.assertTrue(isinstance(serializer.data.fields[field_name], field))


class ManyToManyTests(TestCase):
    def setUp(self):
        class ManyToManySerializer(serializers.ModelSerializer):
            class Meta:
                model = ManyToManyModel

        self.serializer_class = ManyToManySerializer

        # An anchor instance to use for the relationship
        self.anchor = Anchor()
        self.anchor.save()

        # A model instance with a many to many relationship to the anchor
        self.instance = ManyToManyModel()
        self.instance.save()
        self.instance.rel.add(self.anchor)

        # A serialized representation of the model instance
        self.data = {'id': 1, 'rel': [self.anchor.id]}

    def test_retrieve(self):
        """
        Serialize an instance of a model with a ManyToMany relationship.
        """
        serializer = self.serializer_class(instance=self.instance)
        expected = self.data
        self.assertEqual(serializer.data, expected)

    def test_create(self):
        """
        Create an instance of a model with a ManyToMany relationship.
        """
        data = {'rel': [self.anchor.id]}
        serializer = self.serializer_class(data=data)
        self.assertEqual(serializer.is_valid(), True)
        instance = serializer.save()
        self.assertEqual(len(ManyToManyModel.objects.all()), 2)
        self.assertEqual(instance.pk, 2)
        self.assertEqual(list(instance.rel.all()), [self.anchor])

    def test_update(self):
        """
        Update an instance of a model with a ManyToMany relationship.
        """
        new_anchor = Anchor()
        new_anchor.save()
        data = {'rel': [self.anchor.id, new_anchor.id]}
        serializer = self.serializer_class(self.instance, data=data)
        self.assertEqual(serializer.is_valid(), True)
        instance = serializer.save()
        self.assertEqual(len(ManyToManyModel.objects.all()), 1)
        self.assertEqual(instance.pk, 1)
        self.assertEqual(list(instance.rel.all()), [self.anchor, new_anchor])

    def test_create_empty_relationship(self):
        """
        Create an instance of a model with a ManyToMany relationship,
        containing no items.
        """
        data = {'rel': []}
        serializer = self.serializer_class(data=data)
        self.assertEqual(serializer.is_valid(), True)
        instance = serializer.save()
        self.assertEqual(len(ManyToManyModel.objects.all()), 2)
        self.assertEqual(instance.pk, 2)
        self.assertEqual(list(instance.rel.all()), [])

    def test_update_empty_relationship(self):
        """
        Update an instance of a model with a ManyToMany relationship,
        containing no items.
        """
        new_anchor = Anchor()
        new_anchor.save()
        data = {'rel': []}
        serializer = self.serializer_class(self.instance, data=data)
        self.assertEqual(serializer.is_valid(), True)
        instance = serializer.save()
        self.assertEqual(len(ManyToManyModel.objects.all()), 1)
        self.assertEqual(instance.pk, 1)
        self.assertEqual(list(instance.rel.all()), [])

    def test_create_empty_relationship_flat_data(self):
        """
        Create an instance of a model with a ManyToMany relationship,
        containing no items, using a representation that does not support
        lists (eg form data).
        """
        data = MultiValueDict()
        data.setlist('rel', [''])
        serializer = self.serializer_class(data=data)
        self.assertEqual(serializer.is_valid(), True)
        instance = serializer.save()
        self.assertEqual(len(ManyToManyModel.objects.all()), 2)
        self.assertEqual(instance.pk, 2)
        self.assertEqual(list(instance.rel.all()), [])


class ReadOnlyManyToManyTests(TestCase):
    def setUp(self):
        class ReadOnlyManyToManySerializer(serializers.ModelSerializer):
            rel = serializers.RelatedField(many=True, read_only=True)

            class Meta:
                model = ReadOnlyManyToManyModel

        self.serializer_class = ReadOnlyManyToManySerializer

        # An anchor instance to use for the relationship
        self.anchor = Anchor()
        self.anchor.save()

        # A model instance with a many to many relationship to the anchor
        self.instance = ReadOnlyManyToManyModel()
        self.instance.save()
        self.instance.rel.add(self.anchor)

        # A serialized representation of the model instance
        self.data = {'rel': [self.anchor.id], 'id': 1, 'text': 'anchor'}

    def test_update(self):
        """
        Attempt to update an instance of a model with a ManyToMany
        relationship.  Not updated due to read_only=True
        """
        new_anchor = Anchor()
        new_anchor.save()
        data = {'rel': [self.anchor.id, new_anchor.id]}
        serializer = self.serializer_class(self.instance, data=data)
        self.assertEqual(serializer.is_valid(), True)
        instance = serializer.save()
        self.assertEqual(len(ReadOnlyManyToManyModel.objects.all()), 1)
        self.assertEqual(instance.pk, 1)
        # rel is still as original (1 entry)
        self.assertEqual(list(instance.rel.all()), [self.anchor])

    def test_update_without_relationship(self):
        """
        Attempt to update an instance of a model where many to ManyToMany
        relationship is not supplied.  Not updated due to read_only=True
        """
        new_anchor = Anchor()
        new_anchor.save()
        data = {}
        serializer = self.serializer_class(self.instance, data=data)
        self.assertEqual(serializer.is_valid(), True)
        instance = serializer.save()
        self.assertEqual(len(ReadOnlyManyToManyModel.objects.all()), 1)
        self.assertEqual(instance.pk, 1)
        # rel is still as original (1 entry)
        self.assertEqual(list(instance.rel.all()), [self.anchor])


class DefaultValueTests(TestCase):
    def setUp(self):
        class DefaultValueSerializer(serializers.ModelSerializer):
            class Meta:
                model = DefaultValueModel

        self.serializer_class = DefaultValueSerializer
        self.objects = DefaultValueModel.objects

    def test_create_using_default(self):
        data = {}
        serializer = self.serializer_class(data=data)
        self.assertEqual(serializer.is_valid(), True)
        instance = serializer.save()
        self.assertEqual(len(self.objects.all()), 1)
        self.assertEqual(instance.pk, 1)
        self.assertEqual(instance.text, 'foobar')

    def test_create_overriding_default(self):
        data = {'text': 'overridden'}
        serializer = self.serializer_class(data=data)
        self.assertEqual(serializer.is_valid(), True)
        instance = serializer.save()
        self.assertEqual(len(self.objects.all()), 1)
        self.assertEqual(instance.pk, 1)
        self.assertEqual(instance.text, 'overridden')

    def test_partial_update_default(self):
        """ Regression test for issue #532 """
        data = {'text': 'overridden'}
        serializer = self.serializer_class(data=data, partial=True)
        self.assertEqual(serializer.is_valid(), True)
        instance = serializer.save()

        data = {'extra': 'extra_value'}
        serializer = self.serializer_class(instance=instance, data=data, partial=True)
        self.assertEqual(serializer.is_valid(), True)
        instance = serializer.save()

        self.assertEqual(instance.extra, 'extra_value')
        self.assertEqual(instance.text, 'overridden')


class CallableDefaultValueTests(TestCase):
    def setUp(self):
        class CallableDefaultValueSerializer(serializers.ModelSerializer):
            class Meta:
                model = CallableDefaultValueModel

        self.serializer_class = CallableDefaultValueSerializer
        self.objects = CallableDefaultValueModel.objects

    def test_create_using_default(self):
        data = {}
        serializer = self.serializer_class(data=data)
        self.assertEqual(serializer.is_valid(), True)
        instance = serializer.save()
        self.assertEqual(len(self.objects.all()), 1)
        self.assertEqual(instance.pk, 1)
        self.assertEqual(instance.text, 'foobar')

    def test_create_overriding_default(self):
        data = {'text': 'overridden'}
        serializer = self.serializer_class(data=data)
        self.assertEqual(serializer.is_valid(), True)
        instance = serializer.save()
        self.assertEqual(len(self.objects.all()), 1)
        self.assertEqual(instance.pk, 1)
        self.assertEqual(instance.text, 'overridden')


class ManyRelatedTests(TestCase):
    def test_reverse_relations(self):
        post = BlogPost.objects.create(title="Test blog post")
        post.blogpostcomment_set.create(text="I hate this blog post")
        post.blogpostcomment_set.create(text="I love this blog post")

        class BlogPostCommentSerializer(serializers.Serializer):
            text = serializers.CharField()

        class BlogPostSerializer(serializers.Serializer):
            title = serializers.CharField()
            comments = BlogPostCommentSerializer(source='blogpostcomment_set')

        serializer = BlogPostSerializer(instance=post)
        expected = {
            'title': 'Test blog post',
            'comments': [
                {'text': 'I hate this blog post'},
                {'text': 'I love this blog post'}
            ]
        }

        self.assertEqual(serializer.data, expected)

    def test_include_reverse_relations(self):
        post = BlogPost.objects.create(title="Test blog post")
        post.blogpostcomment_set.create(text="I hate this blog post")
        post.blogpostcomment_set.create(text="I love this blog post")

        class BlogPostSerializer(serializers.ModelSerializer):
            class Meta:
                model = BlogPost
                fields = ('id', 'title', 'blogpostcomment_set')

        serializer = BlogPostSerializer(instance=post)
        expected = {
            'id': 1, 'title': 'Test blog post', 'blogpostcomment_set': [1, 2]
        }
        self.assertEqual(serializer.data, expected)

    def test_depth_include_reverse_relations(self):
        post = BlogPost.objects.create(title="Test blog post")
        post.blogpostcomment_set.create(text="I hate this blog post")
        post.blogpostcomment_set.create(text="I love this blog post")

        class BlogPostSerializer(serializers.ModelSerializer):
            class Meta:
                model = BlogPost
                fields = ('id', 'title', 'blogpostcomment_set')
                depth = 1

        serializer = BlogPostSerializer(instance=post)
        expected = {
            'id': 1, 'title': 'Test blog post',
            'blogpostcomment_set': [
                {'id': 1, 'text': 'I hate this blog post', 'blog_post': 1},
                {'id': 2, 'text': 'I love this blog post', 'blog_post': 1}
            ]
        }
        self.assertEqual(serializer.data, expected)

    def test_callable_source(self):
        post = BlogPost.objects.create(title="Test blog post")
        post.blogpostcomment_set.create(text="I love this blog post")

        class BlogPostCommentSerializer(serializers.Serializer):
            text = serializers.CharField()

        class BlogPostSerializer(serializers.Serializer):
            title = serializers.CharField()
            first_comment = BlogPostCommentSerializer(source='get_first_comment')

        serializer = BlogPostSerializer(post)

        expected = {
            'title': 'Test blog post',
            'first_comment': {'text': 'I love this blog post'}
        }
        self.assertEqual(serializer.data, expected)


class RelatedTraversalTest(TestCase):
    def test_nested_traversal(self):
        """
        Source argument should support dotted.source notation.
        """
        user = Person.objects.create(name="django")
        post = BlogPost.objects.create(title="Test blog post", writer=user)
        post.blogpostcomment_set.create(text="I love this blog post")

        class PersonSerializer(serializers.ModelSerializer):
            class Meta:
                model = Person
                fields = ("name", "age")

        class BlogPostCommentSerializer(serializers.ModelSerializer):
            class Meta:
                model = BlogPostComment
                fields = ("text", "post_owner")

            text = serializers.CharField()
            post_owner = PersonSerializer(source='blog_post.writer')

        class BlogPostSerializer(serializers.Serializer):
            title = serializers.CharField()
            comments = BlogPostCommentSerializer(source='blogpostcomment_set')

        serializer = BlogPostSerializer(instance=post)

        expected = {
            'title': 'Test blog post',
            'comments': [{
                'text': 'I love this blog post',
                'post_owner': {
                    "name": "django",
                    "age": None
                }
            }]
        }

        self.assertEqual(serializer.data, expected)

    def test_nested_traversal_with_none(self):
        """
        If a component of the dotted.source is None, return None for the field.
        """
        from rest_framework.tests.models import NullableForeignKeySource
        instance = NullableForeignKeySource.objects.create(name='Source with null FK')

        class NullableSourceSerializer(serializers.Serializer):
            target_name = serializers.Field(source='target.name')

        serializer = NullableSourceSerializer(instance=instance)

        expected = {
            'target_name': None,
        }

        self.assertEqual(serializer.data, expected)


class SerializerMethodFieldTests(TestCase):
    def setUp(self):

        class BoopSerializer(serializers.Serializer):
            beep = serializers.SerializerMethodField('get_beep')
            boop = serializers.Field()
            boop_count = serializers.SerializerMethodField('get_boop_count')

            def get_beep(self, obj):
                return 'hello!'

            def get_boop_count(self, obj):
                return len(obj.boop)

        self.serializer_class = BoopSerializer

    def test_serializer_method_field(self):

        class MyModel(object):
            boop = ['a', 'b', 'c']

        source_data = MyModel()

        serializer = self.serializer_class(source_data)

        expected = {
            'beep': 'hello!',
            'boop': ['a', 'b', 'c'],
            'boop_count': 3,
        }

        self.assertEqual(serializer.data, expected)


# Test for issue #324
class BlankFieldTests(TestCase):
    def setUp(self):

        class BlankFieldModelSerializer(serializers.ModelSerializer):
            class Meta:
                model = BlankFieldModel

        class BlankFieldSerializer(serializers.Serializer):
            title = serializers.CharField(required=False)

        class NotBlankFieldModelSerializer(serializers.ModelSerializer):
            class Meta:
                model = BasicModel

        class NotBlankFieldSerializer(serializers.Serializer):
            title = serializers.CharField()

        self.model_serializer_class = BlankFieldModelSerializer
        self.serializer_class = BlankFieldSerializer
        self.not_blank_model_serializer_class = NotBlankFieldModelSerializer
        self.not_blank_serializer_class = NotBlankFieldSerializer
        self.data = {'title': ''}

    def test_create_blank_field(self):
        serializer = self.serializer_class(data=self.data)
        self.assertEqual(serializer.is_valid(), True)

    def test_create_model_blank_field(self):
        serializer = self.model_serializer_class(data=self.data)
        self.assertEqual(serializer.is_valid(), True)

    def test_create_model_null_field(self):
        serializer = self.model_serializer_class(data={'title': None})
        self.assertEqual(serializer.is_valid(), True)

    def test_create_not_blank_field(self):
        """
        Test to ensure blank data in a field not marked as blank=True
        is considered invalid in a non-model serializer
        """
        serializer = self.not_blank_serializer_class(data=self.data)
        self.assertEqual(serializer.is_valid(), False)

    def test_create_model_not_blank_field(self):
        """
        Test to ensure blank data in a field not marked as blank=True
        is considered invalid in a model serializer
        """
        serializer = self.not_blank_model_serializer_class(data=self.data)
        self.assertEqual(serializer.is_valid(), False)

    def test_create_model_empty_field(self):
        serializer = self.model_serializer_class(data={})
        self.assertEqual(serializer.is_valid(), True)


#test for issue #460
class SerializerPickleTests(TestCase):
    """
    Test pickleability of the output of Serializers
    """
    def test_pickle_simple_model_serializer_data(self):
        """
        Test simple serializer
        """
        pickle.dumps(PersonSerializer(Person(name="Methusela", age=969)).data)

    def test_pickle_inner_serializer(self):
        """
        Test pickling a serializer whose resulting .data (a SortedDictWithMetadata) will
        have unpickleable meta data--in order to make sure metadata doesn't get pulled into the pickle.
        See DictWithMetadata.__getstate__
        """
        class InnerPersonSerializer(serializers.ModelSerializer):
            class Meta:
                model = Person
                fields = ('name', 'age')
        pickle.dumps(InnerPersonSerializer(Person(name="Noah", age=950)).data, 0)

    def test_getstate_method_should_not_return_none(self):
        """
        Regression test for #645.
        """
        data = serializers.DictWithMetadata({1: 1})
        self.assertEqual(data.__getstate__(), serializers.SortedDict({1: 1}))

    def test_serializer_data_is_pickleable(self):
        """
        Another regression test for #645.
        """
        data = serializers.SortedDictWithMetadata({1: 1})
        repr(pickle.loads(pickle.dumps(data, 0)))


# test for issue #725
class SeveralChoicesModel(models.Model):
    color = models.CharField(
        max_length=10,
        choices=[('red', 'Red'), ('green', 'Green'), ('blue', 'Blue')],
        blank=False
    )
    drink = models.CharField(
        max_length=10,
        choices=[('beer', 'Beer'), ('wine', 'Wine'), ('cider', 'Cider')],
        blank=False,
        default='beer'
    )
    os = models.CharField(
        max_length=10,
        choices=[('linux', 'Linux'), ('osx', 'OSX'), ('windows', 'Windows')],
        blank=True
    )
    music_genre = models.CharField(
        max_length=10,
        choices=[('rock', 'Rock'), ('metal', 'Metal'), ('grunge', 'Grunge')],
        blank=True,
        default='metal'
    )


class SerializerChoiceFields(TestCase):

    def setUp(self):
        super(SerializerChoiceFields, self).setUp()

        class SeveralChoicesSerializer(serializers.ModelSerializer):
            class Meta:
                model = SeveralChoicesModel
                fields = ('color', 'drink', 'os', 'music_genre')

        self.several_choices_serializer = SeveralChoicesSerializer

    def test_choices_blank_false_not_default(self):
        serializer = self.several_choices_serializer()
        self.assertEqual(
            serializer.fields['color'].choices,
            [('red', 'Red'), ('green', 'Green'), ('blue', 'Blue')]
        )

    def test_choices_blank_false_with_default(self):
        serializer = self.several_choices_serializer()
        self.assertEqual(
            serializer.fields['drink'].choices,
            [('beer', 'Beer'), ('wine', 'Wine'), ('cider', 'Cider')]
        )

    def test_choices_blank_true_not_default(self):
        serializer = self.several_choices_serializer()
        self.assertEqual(
            serializer.fields['os'].choices,
            BLANK_CHOICE_DASH + [('linux', 'Linux'), ('osx', 'OSX'), ('windows', 'Windows')]
        )

    def test_choices_blank_true_with_default(self):
        serializer = self.several_choices_serializer()
        self.assertEqual(
            serializer.fields['music_genre'].choices,
            BLANK_CHOICE_DASH + [('rock', 'Rock'), ('metal', 'Metal'), ('grunge', 'Grunge')]
        )


# Regression tests for #675
class Ticket(models.Model):
    assigned = models.ForeignKey(
        Person, related_name='assigned_tickets')
    reviewer = models.ForeignKey(
        Person, blank=True, null=True, related_name='reviewed_tickets')


class SerializerRelatedChoicesTest(TestCase):

    def setUp(self):
        super(SerializerRelatedChoicesTest, self).setUp()

        class RelatedChoicesSerializer(serializers.ModelSerializer):
            class Meta:
                model = Ticket
                fields = ('assigned', 'reviewer')

        self.related_fields_serializer = RelatedChoicesSerializer

    def test_empty_queryset_required(self):
        serializer = self.related_fields_serializer()
        self.assertEqual(serializer.fields['assigned'].queryset.count(), 0)
        self.assertEqual(
            [x for x in serializer.fields['assigned'].widget.choices],
            []
        )

    def test_empty_queryset_not_required(self):
        serializer = self.related_fields_serializer()
        self.assertEqual(serializer.fields['reviewer'].queryset.count(), 0)
        self.assertEqual(
            [x for x in serializer.fields['reviewer'].widget.choices],
            [('', '---------')]
        )

    def test_with_some_persons_required(self):
        Person.objects.create(name="Lionel Messi")
        Person.objects.create(name="Xavi Hernandez")
        serializer = self.related_fields_serializer()
        self.assertEqual(serializer.fields['assigned'].queryset.count(), 2)
        self.assertEqual(
            [x for x in serializer.fields['assigned'].widget.choices],
            [(1, 'Person object - 1'), (2, 'Person object - 2')]
        )

    def test_with_some_persons_not_required(self):
        Person.objects.create(name="Lionel Messi")
        Person.objects.create(name="Xavi Hernandez")
        serializer = self.related_fields_serializer()
        self.assertEqual(serializer.fields['reviewer'].queryset.count(), 2)
        self.assertEqual(
            [x for x in serializer.fields['reviewer'].widget.choices],
            [('', '---------'), (1, 'Person object - 1'), (2, 'Person object - 2')]
        )


class DepthTest(TestCase):
    def test_implicit_nesting(self):

        writer = Person.objects.create(name="django", age=1)
        post = BlogPost.objects.create(title="Test blog post", writer=writer)
        comment = BlogPostComment.objects.create(text="Test blog post comment", blog_post=post)

        class BlogPostCommentSerializer(serializers.ModelSerializer):
            class Meta:
                model = BlogPostComment
                depth = 2

        serializer = BlogPostCommentSerializer(instance=comment)
        expected = {'id': 1, 'text': 'Test blog post comment', 'blog_post': {'id': 1, 'title': 'Test blog post',
                    'writer': {'id': 1, 'name': 'django', 'age': 1}}}

        self.assertEqual(serializer.data, expected)

    def test_explicit_nesting(self):
        writer = Person.objects.create(name="django", age=1)
        post = BlogPost.objects.create(title="Test blog post", writer=writer)
        comment = BlogPostComment.objects.create(text="Test blog post comment", blog_post=post)

        class PersonSerializer(serializers.ModelSerializer):
            class Meta:
                model = Person

        class BlogPostSerializer(serializers.ModelSerializer):
            writer = PersonSerializer()

            class Meta:
                model = BlogPost

        class BlogPostCommentSerializer(serializers.ModelSerializer):
            blog_post = BlogPostSerializer()

            class Meta:
                model = BlogPostComment

        serializer = BlogPostCommentSerializer(instance=comment)
        expected = {'id': 1, 'text': 'Test blog post comment', 'blog_post': {'id': 1, 'title': 'Test blog post',
                    'writer': {'id': 1, 'name': 'django', 'age': 1}}}

        self.assertEqual(serializer.data, expected)


class NestedSerializerContextTests(TestCase):

    def test_nested_serializer_context(self):
        """
        Regression for #497

        https://github.com/tomchristie/django-rest-framework/issues/497
        """
        class PhotoSerializer(serializers.ModelSerializer):
            class Meta:
                model = Photo
                fields = ("description", "callable")

            callable = serializers.SerializerMethodField('_callable')

            def _callable(self, instance):
                if not 'context_item' in self.context:
                    raise RuntimeError("context isn't getting passed into 2nd level nested serializer")
                return "success"

        class AlbumSerializer(serializers.ModelSerializer):
            class Meta:
                model = Album
                fields = ("photo_set", "callable")

            photo_set = PhotoSerializer(source="photo_set")
            callable = serializers.SerializerMethodField("_callable")

            def _callable(self, instance):
                if not 'context_item' in self.context:
                    raise RuntimeError("context isn't getting passed into 1st level nested serializer")
                return "success"

        class AlbumCollection(object):
            albums = None

        class AlbumCollectionSerializer(serializers.Serializer):
            albums = AlbumSerializer(source="albums")

        album1 = Album.objects.create(title="album 1")
        album2 = Album.objects.create(title="album 2")
        Photo.objects.create(description="Bigfoot", album=album1)
        Photo.objects.create(description="Unicorn", album=album1)
        Photo.objects.create(description="Yeti", album=album2)
        Photo.objects.create(description="Sasquatch", album=album2)
        album_collection = AlbumCollection()
        album_collection.albums = [album1, album2]

        # This will raise RuntimeError if context doesn't get passed correctly to the nested Serializers
        AlbumCollectionSerializer(album_collection, context={'context_item': 'album context'}).data


class DeserializeListTestCase(TestCase):

    def setUp(self):
        self.data = {
            'email': 'nobody@nowhere.com',
            'content': 'This is some test content',
            'created': datetime.datetime(2013, 3, 7),
        }

    def test_no_errors(self):
        data = [self.data.copy() for x in range(0, 3)]
        serializer = CommentSerializer(data=data, many=True)
        self.assertTrue(serializer.is_valid())
        self.assertTrue(isinstance(serializer.object, list))
        self.assertTrue(
            all((isinstance(item, Comment) for item in serializer.object))
        )

    def test_errors_return_as_list(self):
        invalid_item = self.data.copy()
        invalid_item['email'] = ''
        data = [self.data.copy(), invalid_item, self.data.copy()]

        serializer = CommentSerializer(data=data, many=True)
        self.assertFalse(serializer.is_valid())
        expected = [{}, {'email': ['This field is required.']}, {}]
        self.assertEqual(serializer.errors, expected)


# Test for issue 747

class LazyStringModel(object):
    def __init__(self, lazystring):
        self.lazystring = lazystring


class LazyStringSerializer(serializers.Serializer):
    lazystring = serializers.Field()

    def restore_object(self, attrs, instance=None):
        if instance is not None:
            instance.lazystring = attrs.get('lazystring', instance.lazystring)
            return instance
        return LazyStringModel(**attrs)


class LazyStringsTestCase(TestCase):
    def setUp(self):
        self.model = LazyStringModel(lazystring=_('lazystring'))

    def test_lazy_strings_are_translated(self):
        serializer = LazyStringSerializer(self.model)
        self.assertEqual(type(serializer.data['lazystring']),
                         type('lazystring'))


# Test for issue #467

class FieldLabelTest(TestCase):
    def setUp(self):
        self.serializer_class = BasicModelSerializer

    def test_label_from_model(self):
        """
        Validates that label and help_text are correctly copied from the model class.
        """
        serializer = self.serializer_class()
        text_field = serializer.fields['text']

        self.assertEqual('Text comes here', text_field.label)
        self.assertEqual('Text description.', text_field.help_text)

    def test_field_ctor(self):
        """
        This is check that ctor supports both label and help_text.
        """
        self.assertEqual('Label', fields.Field(label='Label', help_text='Help').label)
        self.assertEqual('Help', fields.CharField(label='Label', help_text='Help').help_text)
        self.assertEqual('Label', relations.HyperlinkedRelatedField(view_name='fake', label='Label', help_text='Help', many=True).label)


class AttributeMappingOnAutogeneratedFieldsTests(TestCase):

    def setUp(self):
        class AMOAFModel(RESTFrameworkModel):
            char_field = models.CharField(max_length=1024, blank=True)
            comma_separated_integer_field = models.CommaSeparatedIntegerField(max_length=1024, blank=True)
            decimal_field = models.DecimalField(max_digits=64, decimal_places=32, blank=True)
            email_field = models.EmailField(max_length=1024, blank=True)
            file_field = models.FileField(max_length=1024, blank=True)
            image_field = models.ImageField(max_length=1024, blank=True)
            slug_field = models.SlugField(max_length=1024, blank=True)
            url_field = models.URLField(max_length=1024, blank=True)

        class AMOAFSerializer(serializers.ModelSerializer):
            class Meta:
                model = AMOAFModel

        self.serializer_class = AMOAFSerializer
        self.fields_attributes = {
            'char_field': [
                ('max_length', 1024),
            ],
            'comma_separated_integer_field': [
                ('max_length', 1024),
            ],
            'decimal_field': [
                ('max_digits', 64),
                ('decimal_places', 32),
            ],
            'email_field': [
                ('max_length', 1024),
            ],
            'file_field': [
                ('max_length', 1024),
            ],
            'image_field': [
                ('max_length', 1024),
            ],
            'slug_field': [
                ('max_length', 1024),
            ],
            'url_field': [
                ('max_length', 1024),
            ],
        }

    def field_test(self, field):
        serializer = self.serializer_class(data={})
        self.assertEqual(serializer.is_valid(), True)

        for attribute in self.fields_attributes[field]:
            self.assertEqual(
                getattr(serializer.fields[field], attribute[0]),
                attribute[1]
            )

    def test_char_field(self):
        self.field_test('char_field')

    def test_comma_separated_integer_field(self):
        self.field_test('comma_separated_integer_field')

    def test_decimal_field(self):
        self.field_test('decimal_field')

    def test_email_field(self):
        self.field_test('email_field')

    def test_file_field(self):
        self.field_test('file_field')

    def test_image_field(self):
        self.field_test('image_field')

    def test_slug_field(self):
        self.field_test('slug_field')

    def test_url_field(self):
        self.field_test('url_field')


class DefaultValuesOnAutogeneratedFieldsTests(TestCase):

    def setUp(self):
        class DVOAFModel(RESTFrameworkModel):
            positive_integer_field = models.PositiveIntegerField(blank=True)
            positive_small_integer_field = models.PositiveSmallIntegerField(blank=True)
            email_field = models.EmailField(blank=True)
            file_field = models.FileField(blank=True)
            image_field = models.ImageField(blank=True)
            slug_field = models.SlugField(blank=True)
            url_field = models.URLField(blank=True)

        class DVOAFSerializer(serializers.ModelSerializer):
            class Meta:
                model = DVOAFModel

        self.serializer_class = DVOAFSerializer
        self.fields_attributes = {
            'positive_integer_field': [
                ('min_value', 0),
            ],
            'positive_small_integer_field': [
                ('min_value', 0),
            ],
            'email_field': [
                ('max_length', 75),
            ],
            'file_field': [
                ('max_length', 100),
            ],
            'image_field': [
                ('max_length', 100),
            ],
            'slug_field': [
                ('max_length', 50),
            ],
            'url_field': [
                ('max_length', 200),
            ],
        }

    def field_test(self, field):
        serializer = self.serializer_class(data={})
        self.assertEqual(serializer.is_valid(), True)

        for attribute in self.fields_attributes[field]:
            self.assertEqual(
                getattr(serializer.fields[field], attribute[0]),
                attribute[1]
            )

    def test_positive_integer_field(self):
        self.field_test('positive_integer_field')

    def test_positive_small_integer_field(self):
        self.field_test('positive_small_integer_field')

    def test_email_field(self):
        self.field_test('email_field')

    def test_file_field(self):
        self.field_test('file_field')

    def test_image_field(self):
        self.field_test('image_field')

    def test_slug_field(self):
        self.field_test('slug_field')

    def test_url_field(self):
        self.field_test('url_field')