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"""
General tests for relational fields.
"""
from __future__ import unicode_literals
from django.db import models
from django.test import TestCase
from rest_framework import serializers
from rest_framework.tests.models import BlogPost
class NullModel(models.Model):
pass
class FieldTests(TestCase):
def test_pk_related_field_with_empty_string(self):
"""
Regression test for #446
https://github.com/tomchristie/django-rest-framework/issues/446
"""
field = serializers.PrimaryKeyRelatedField(queryset=NullModel.objects.all())
self.assertRaises(serializers.ValidationError, field.from_native, '')
self.assertRaises(serializers.ValidationError, field.from_native, [])
def test_hyperlinked_related_field_with_empty_string(self):
field = serializers.HyperlinkedRelatedField(queryset=NullModel.objects.all(), view_name='')
self.assertRaises(serializers.ValidationError, field.from_native, '')
self.assertRaises(serializers.ValidationError, field.from_native, [])
def test_slug_related_field_with_empty_string(self):
field = serializers.SlugRelatedField(queryset=NullModel.objects.all(), slug_field='pk')
self.assertRaises(serializers.ValidationError, field.from_native, '')
self.assertRaises(serializers.ValidationError, field.from_native, [])
class TestManyRelatedMixin(TestCase):
def test_missing_many_to_many_related_field(self):
'''
Regression test for #632
https://github.com/tomchristie/django-rest-framework/pull/632
'''
field = serializers.RelatedField(many=True, read_only=False)
into = {}
field.field_from_native({}, None, 'field_name', into)
self.assertEqual(into['field_name'], [])
# Regression tests for #694 (`source` attribute on related fields)
class RelatedFieldSourceTests(TestCase):
def test_related_manager_source(self):
"""
Relational fields should be able to use manager-returning methods as their source.
"""
BlogPost.objects.create(title='blah')
field = serializers.RelatedField(many=True, source='get_blogposts_manager')
class ClassWithManagerMethod(object):
def get_blogposts_manager(self):
return BlogPost.objects
obj = ClassWithManagerMethod()
value = field.field_to_native(obj, 'field_name')
self.assertEqual(value, ['BlogPost object'])
def test_related_queryset_source(self):
"""
Relational fields should be able to use queryset-returning methods as their source.
"""
BlogPost.objects.create(title='blah')
field = serializers.RelatedField(many=True, source='get_blogposts_queryset')
class ClassWithQuerysetMethod(object):
def get_blogposts_queryset(self):
return BlogPost.objects.all()
obj = ClassWithQuerysetMethod()
value = field.field_to_native(obj, 'field_name')
self.assertEqual(value, ['BlogPost object'])
def test_dotted_source(self):
"""
Source argument should support dotted.source notation.
"""
BlogPost.objects.create(title='blah')
field = serializers.RelatedField(many=True, source='a.b.c')
class ClassWithQuerysetMethod(object):
a = {
'b': {
'c': BlogPost.objects.all()
}
}
obj = ClassWithQuerysetMethod()
value = field.field_to_native(obj, 'field_name')
self.assertEqual(value, ['BlogPost object'])
# Regression for #1129
def test_exception_for_incorect_fk(self):
"""
Check that the exception message are correct if the source field
doesn't exist.
"""
from rest_framework.tests.models import ManyToManySource
class Meta:
model = ManyToManySource
attrs = {
'name': serializers.SlugRelatedField(
slug_field='name', source='banzai'),
'Meta': Meta,
}
TestSerializer = type(str('TestSerializer'),
(serializers.ModelSerializer,), attrs)
with self.assertRaises(AttributeError):
TestSerializer(data={'name': 'foo'})
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