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from __future__ import unicode_literals
import datetime
from decimal import Decimal
from django.test import TestCase
from django.utils import unittest
from rest_framework import generics, serializers, status, filters
from rest_framework.compat import django_filters
from rest_framework.test import APIRequestFactory
from .models import BasicModel, FilterableItem
factory = APIRequestFactory()
# Helper function to split arguments out of an url
def split_arguments_from_url(url):
if '?' not in url:
return url
path, args = url.split('?')
args = dict(r.split('=') for r in args.split('&'))
return path, args
class BasicSerializer(serializers.ModelSerializer):
class Meta:
model = BasicModel
class FilterableItemSerializer(serializers.ModelSerializer):
class Meta:
model = FilterableItem
class RootView(generics.ListCreateAPIView):
"""
Example description for OPTIONS.
"""
queryset = BasicModel.objects.all()
serializer_class = BasicSerializer
paginate_by = 10
class DefaultPageSizeKwargView(generics.ListAPIView):
"""
View for testing default paginate_by_param usage
"""
queryset = BasicModel.objects.all()
serializer_class = BasicSerializer
class PaginateByParamView(generics.ListAPIView):
"""
View for testing custom paginate_by_param usage
"""
queryset = BasicModel.objects.all()
serializer_class = BasicSerializer
paginate_by_param = 'page_size'
class MaxPaginateByView(generics.ListAPIView):
"""
View for testing custom max_paginate_by usage
"""
queryset = BasicModel.objects.all()
serializer_class = BasicSerializer
paginate_by = 3
max_paginate_by = 5
paginate_by_param = 'page_size'
class IntegrationTestPagination(TestCase):
"""
Integration tests for paginated list views.
"""
def setUp(self):
"""
Create 26 BasicModel instances.
"""
for char in 'abcdefghijklmnopqrstuvwxyz':
BasicModel(text=char * 3).save()
self.objects = BasicModel.objects
self.data = [
{'id': obj.id, 'text': obj.text}
for obj in self.objects.all()
]
self.view = RootView.as_view()
def test_get_paginated_root_view(self):
"""
GET requests to paginated ListCreateAPIView should return paginated results.
"""
request = factory.get('/')
# Note: Database queries are a `SELECT COUNT`, and `SELECT <fields>`
with self.assertNumQueries(2):
response = self.view(request).render()
self.assertEqual(response.status_code, status.HTTP_200_OK)
self.assertEqual(response.data['count'], 26)
self.assertEqual(response.data['results'], self.data[:10])
self.assertNotEqual(response.data['next'], None)
self.assertEqual(response.data['previous'], None)
request = factory.get(*split_arguments_from_url(response.data['next']))
with self.assertNumQueries(2):
response = self.view(request).render()
self.assertEqual(response.status_code, status.HTTP_200_OK)
self.assertEqual(response.data['count'], 26)
self.assertEqual(response.data['results'], self.data[10:20])
self.assertNotEqual(response.data['next'], None)
self.assertNotEqual(response.data['previous'], None)
request = factory.get(*split_arguments_from_url(response.data['next']))
with self.assertNumQueries(2):
response = self.view(request).render()
self.assertEqual(response.status_code, status.HTTP_200_OK)
self.assertEqual(response.data['count'], 26)
self.assertEqual(response.data['results'], self.data[20:])
self.assertEqual(response.data['next'], None)
self.assertNotEqual(response.data['previous'], None)
class IntegrationTestPaginationAndFiltering(TestCase):
def setUp(self):
"""
Create 50 FilterableItem instances.
"""
base_data = ('a', Decimal('0.25'), datetime.date(2012, 10, 8))
for i in range(26):
text = chr(i + ord(base_data[0])) * 3 # Produces string 'aaa', 'bbb', etc.
decimal = base_data[1] + i
date = base_data[2] - datetime.timedelta(days=i * 2)
FilterableItem(text=text, decimal=decimal, date=date).save()
self.objects = FilterableItem.objects
self.data = [
{'id': obj.id, 'text': obj.text, 'decimal': str(obj.decimal), 'date': obj.date.isoformat()}
for obj in self.objects.all()
]
@unittest.skipUnless(django_filters, 'django-filter not installed')
def test_get_django_filter_paginated_filtered_root_view(self):
"""
GET requests to paginated filtered ListCreateAPIView should return
paginated results. The next and previous links should preserve the
filtered parameters.
"""
class DecimalFilter(django_filters.FilterSet):
decimal = django_filters.NumberFilter(lookup_type='lt')
class Meta:
model = FilterableItem
fields = ['text', 'decimal', 'date']
class FilterFieldsRootView(generics.ListCreateAPIView):
queryset = FilterableItem.objects.all()
serializer_class = FilterableItemSerializer
paginate_by = 10
filter_class = DecimalFilter
filter_backends = (filters.DjangoFilterBackend,)
view = FilterFieldsRootView.as_view()
EXPECTED_NUM_QUERIES = 2
request = factory.get('/', {'decimal': '15.20'})
with self.assertNumQueries(EXPECTED_NUM_QUERIES):
response = view(request).render()
self.assertEqual(response.status_code, status.HTTP_200_OK)
self.assertEqual(response.data['count'], 15)
self.assertEqual(response.data['results'], self.data[:10])
self.assertNotEqual(response.data['next'], None)
self.assertEqual(response.data['previous'], None)
request = factory.get(*split_arguments_from_url(response.data['next']))
with self.assertNumQueries(EXPECTED_NUM_QUERIES):
response = view(request).render()
self.assertEqual(response.status_code, status.HTTP_200_OK)
self.assertEqual(response.data['count'], 15)
self.assertEqual(response.data['results'], self.data[10:15])
self.assertEqual(response.data['next'], None)
self.assertNotEqual(response.data['previous'], None)
request = factory.get(*split_arguments_from_url(response.data['previous']))
with self.assertNumQueries(EXPECTED_NUM_QUERIES):
response = view(request).render()
self.assertEqual(response.status_code, status.HTTP_200_OK)
self.assertEqual(response.data['count'], 15)
self.assertEqual(response.data['results'], self.data[:10])
self.assertNotEqual(response.data['next'], None)
self.assertEqual(response.data['previous'], None)
def test_get_basic_paginated_filtered_root_view(self):
"""
Same as `test_get_django_filter_paginated_filtered_root_view`,
except using a custom filter backend instead of the django-filter
backend,
"""
class DecimalFilterBackend(filters.BaseFilterBackend):
def filter_queryset(self, request, queryset, view):
return queryset.filter(decimal__lt=Decimal(request.GET['decimal']))
class BasicFilterFieldsRootView(generics.ListCreateAPIView):
queryset = FilterableItem.objects.all()
serializer_class = FilterableItemSerializer
paginate_by = 10
filter_backends = (DecimalFilterBackend,)
view = BasicFilterFieldsRootView.as_view()
request = factory.get('/', {'decimal': '15.20'})
with self.assertNumQueries(2):
response = view(request).render()
self.assertEqual(response.status_code, status.HTTP_200_OK)
self.assertEqual(response.data['count'], 15)
self.assertEqual(response.data['results'], self.data[:10])
self.assertNotEqual(response.data['next'], None)
self.assertEqual(response.data['previous'], None)
request = factory.get(*split_arguments_from_url(response.data['next']))
with self.assertNumQueries(2):
response = view(request).render()
self.assertEqual(response.status_code, status.HTTP_200_OK)
self.assertEqual(response.data['count'], 15)
self.assertEqual(response.data['results'], self.data[10:15])
self.assertEqual(response.data['next'], None)
self.assertNotEqual(response.data['previous'], None)
request = factory.get(*split_arguments_from_url(response.data['previous']))
with self.assertNumQueries(2):
response = view(request).render()
self.assertEqual(response.status_code, status.HTTP_200_OK)
self.assertEqual(response.data['count'], 15)
self.assertEqual(response.data['results'], self.data[:10])
self.assertNotEqual(response.data['next'], None)
self.assertEqual(response.data['previous'], None)
class TestUnpaginated(TestCase):
"""
Tests for list views without pagination.
"""
def setUp(self):
"""
Create 13 BasicModel instances.
"""
for i in range(13):
BasicModel(text=i).save()
self.objects = BasicModel.objects
self.data = [
{'id': obj.id, 'text': obj.text}
for obj in self.objects.all()
]
self.view = DefaultPageSizeKwargView.as_view()
def test_unpaginated(self):
"""
Tests the default page size for this view.
no page size --> no limit --> no meta data
"""
request = factory.get('/')
response = self.view(request)
self.assertEqual(response.data, self.data)
class TestCustomPaginateByParam(TestCase):
"""
Tests for list views with default page size kwarg
"""
def setUp(self):
"""
Create 13 BasicModel instances.
"""
for i in range(13):
BasicModel(text=i).save()
self.objects = BasicModel.objects
self.data = [
{'id': obj.id, 'text': obj.text}
for obj in self.objects.all()
]
self.view = PaginateByParamView.as_view()
def test_default_page_size(self):
"""
Tests the default page size for this view.
no page size --> no limit --> no meta data
"""
request = factory.get('/')
response = self.view(request).render()
self.assertEqual(response.data, self.data)
def test_paginate_by_param(self):
"""
If paginate_by_param is set, the new kwarg should limit per view requests.
"""
request = factory.get('/', {'page_size': 5})
response = self.view(request).render()
self.assertEqual(response.data['count'], 13)
self.assertEqual(response.data['results'], self.data[:5])
class TestMaxPaginateByParam(TestCase):
"""
Tests for list views with max_paginate_by kwarg
"""
def setUp(self):
"""
Create 13 BasicModel instances.
"""
for i in range(13):
BasicModel(text=i).save()
self.objects = BasicModel.objects
self.data = [
{'id': obj.id, 'text': obj.text}
for obj in self.objects.all()
]
self.view = MaxPaginateByView.as_view()
def test_max_paginate_by(self):
"""
If max_paginate_by is set, it should limit page size for the view.
"""
request = factory.get('/', data={'page_size': 10})
response = self.view(request).render()
self.assertEqual(response.data['count'], 13)
self.assertEqual(response.data['results'], self.data[:5])
def test_max_paginate_by_without_page_size_param(self):
"""
If max_paginate_by is set, but client does not specifiy page_size,
standard `paginate_by` behavior should be used.
"""
request = factory.get('/')
response = self.view(request).render()
self.assertEqual(response.data['results'], self.data[:3])
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