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Add pagination. Thanks @devioustree!
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@ -4,20 +4,17 @@ classes that can be added to a `View`.
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"""
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from django.contrib.auth.models import AnonymousUser
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from django.db.models.query import QuerySet
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from django.core.paginator import Paginator
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from django.db.models.fields.related import ForeignKey
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from django.http import HttpResponse
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from djangorestframework import status
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from djangorestframework.parsers import FormParser, MultiPartParser
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from djangorestframework.renderers import BaseRenderer
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from djangorestframework.resources import Resource, FormResource, ModelResource
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from djangorestframework.response import Response, ErrorResponse
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from djangorestframework.utils import as_tuple, MSIE_USER_AGENT_REGEX
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from djangorestframework.utils.mediatypes import is_form_media_type, order_by_precedence
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from decimal import Decimal
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import re
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from StringIO import StringIO
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@ -640,3 +637,93 @@ class ListModelMixin(object):
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return queryset.filter(**kwargs)
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########## Pagination Mixins ##########
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class PaginatorMixin(object):
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"""
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Adds pagination support to GET requests
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Obviously should only be used on lists :)
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A default limit can be set by setting `limit` on the object. This will also
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be used as the maximum if the client sets the `limit` GET param
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"""
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limit = 20
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def get_limit(self):
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""" Helper method to determine what the `limit` should be """
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try:
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limit = int(self.request.GET.get('limit', self.limit))
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return min(limit, self.limit)
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except ValueError:
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return self.limit
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def url_with_page_number(self, page_number):
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""" Constructs a url used for getting the next/previous urls """
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url = "%s?page=%d" % (self.request.path, page_number)
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limit = self.get_limit()
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if limit != self.limit:
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url = "%s&limit=%d" % (url, limit)
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return url
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def next(self, page):
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""" Returns a url to the next page of results (if any) """
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if not page.has_next():
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return None
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return self.url_with_page_number(page.next_page_number())
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def previous(self, page):
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""" Returns a url to the previous page of results (if any) """
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if not page.has_previous():
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return None
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return self.url_with_page_number(page.previous_page_number())
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def serialize_page_info(self, page):
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""" This is some useful information that is added to the response """
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return {
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'next': self.next(page),
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'page': page.number,
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'pages': page.paginator.num_pages,
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'per_page': self.get_limit(),
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'previous': self.previous(page),
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'total': page.paginator.count,
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}
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def filter_response(self, obj):
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"""
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Given the response content, paginate and then serialize.
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The response is modified to include to useful data relating to the number
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of objects, number of pages, next/previous urls etc. etc.
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The serialised objects are put into `results` on this new, modified
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response
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"""
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# We don't want to paginate responses for anything other than GET requests
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if self.method.upper() != 'GET':
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return self._resource.filter_response(obj)
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paginator = Paginator(obj, self.get_limit())
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try:
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page_num = int(self.request.GET.get('page', '1'))
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except ValueError:
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raise ErrorResponse(status.HTTP_404_NOT_FOUND,
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{'detail': 'That page contains no results'})
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if page_num not in paginator.page_range:
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raise ErrorResponse(status.HTTP_404_NOT_FOUND,
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{'detail': 'That page contains no results'})
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page = paginator.page(page_num)
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serialized_object_list = self._resource.filter_response(page.object_list)
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serialized_page_info = self.serialize_page_info(page)
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serialized_page_info['results'] = serialized_object_list
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return serialized_page_info
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@ -1,11 +1,14 @@
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"""Tests for the status module"""
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"""Tests for the mixin module"""
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from django.test import TestCase
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from django.utils import simplejson as json
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from djangorestframework import status
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from djangorestframework.compat import RequestFactory
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from django.contrib.auth.models import Group, User
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from djangorestframework.mixins import CreateModelMixin
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from djangorestframework.mixins import CreateModelMixin, PaginatorMixin
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from djangorestframework.resources import ModelResource
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from djangorestframework.response import Response
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from djangorestframework.tests.models import CustomUser
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from djangorestframework.views import View
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class TestModelCreation(TestCase):
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@ -30,7 +33,6 @@ class TestModelCreation(TestCase):
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self.assertEquals(1, Group.objects.count())
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self.assertEquals('foo', response.cleaned_content.name)
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def test_creation_with_m2m_relation(self):
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class UserResource(ModelResource):
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model = User
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@ -41,7 +43,11 @@ class TestModelCreation(TestCase):
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group = Group(name='foo')
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group.save()
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form_data = {'username': 'bar', 'password': 'baz', 'groups': [group.id]}
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form_data = {
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'username': 'bar',
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'password': 'baz',
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'groups': [group.id]
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}
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request = self.req.post('/groups', data=form_data)
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cleaned_data = dict(form_data)
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cleaned_data['groups'] = [group]
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@ -92,7 +98,6 @@ class TestModelCreation(TestCase):
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self.assertEquals(1, response.cleaned_content.groups.count())
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self.assertEquals('foo1', response.cleaned_content.groups.all()[0].name)
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group2 = Group(name='foo2')
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group2.save()
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@ -111,3 +116,122 @@ class TestModelCreation(TestCase):
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self.assertEquals('foo2', response.cleaned_content.groups.all()[1].name)
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class MockPaginatorView(PaginatorMixin, View):
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total = 60
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def get(self, request):
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return range(0, self.total)
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def post(self, request):
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return Response(status.CREATED, {'status': 'OK'})
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class TestPagination(TestCase):
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def setUp(self):
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self.req = RequestFactory()
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def test_default_limit(self):
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""" Tests if pagination works without overwriting the limit """
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request = self.req.get('/paginator')
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response = MockPaginatorView.as_view()(request)
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content = json.loads(response.content)
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self.assertEqual(response.status_code, status.OK)
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self.assertEqual(MockPaginatorView.total, content['total'])
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self.assertEqual(MockPaginatorView.limit, content['per_page'])
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self.assertEqual(range(0, MockPaginatorView.limit), content['results'])
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def test_overwriting_limit(self):
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""" Tests if the limit can be overwritten """
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limit = 10
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request = self.req.get('/paginator')
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response = MockPaginatorView.as_view(limit=limit)(request)
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content = json.loads(response.content)
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self.assertEqual(response.status_code, status.OK)
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self.assertEqual(content['per_page'], limit)
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self.assertEqual(range(0, limit), content['results'])
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def test_limit_param(self):
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""" Tests if the client can set the limit """
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from math import ceil
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limit = 5
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num_pages = int(ceil(MockPaginatorView.total / float(limit)))
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request = self.req.get('/paginator/?limit=%d' % limit)
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response = MockPaginatorView.as_view()(request)
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content = json.loads(response.content)
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self.assertEqual(response.status_code, status.OK)
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self.assertEqual(MockPaginatorView.total, content['total'])
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self.assertEqual(limit, content['per_page'])
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self.assertEqual(num_pages, content['pages'])
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def test_exceeding_limit(self):
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""" Makes sure the client cannot exceed the default limit """
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from math import ceil
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limit = MockPaginatorView.limit + 10
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num_pages = int(ceil(MockPaginatorView.total / float(limit)))
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request = self.req.get('/paginator/?limit=%d' % limit)
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response = MockPaginatorView.as_view()(request)
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content = json.loads(response.content)
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self.assertEqual(response.status_code, status.OK)
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self.assertEqual(MockPaginatorView.total, content['total'])
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self.assertNotEqual(limit, content['per_page'])
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self.assertNotEqual(num_pages, content['pages'])
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self.assertEqual(MockPaginatorView.limit, content['per_page'])
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def test_only_works_for_get(self):
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""" Pagination should only work for GET requests """
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request = self.req.post('/paginator', data={'content': 'spam'})
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response = MockPaginatorView.as_view()(request)
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content = json.loads(response.content)
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self.assertEqual(response.status_code, status.CREATED)
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self.assertEqual(None, content.get('per_page'))
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self.assertEqual('OK', content['status'])
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def test_non_int_page(self):
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""" Tests that it can handle invalid values """
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request = self.req.get('/paginator/?page=spam')
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response = MockPaginatorView.as_view()(request)
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self.assertEqual(response.status_code, status.NOT_FOUND)
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def test_page_range(self):
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""" Tests that the page range is handle correctly """
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request = self.req.get('/paginator/?page=0')
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response = MockPaginatorView.as_view()(request)
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content = json.loads(response.content)
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self.assertEqual(response.status_code, status.NOT_FOUND)
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request = self.req.get('/paginator/')
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response = MockPaginatorView.as_view()(request)
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content = json.loads(response.content)
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self.assertEqual(response.status_code, status.OK)
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self.assertEqual(range(0, MockPaginatorView.limit), content['results'])
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num_pages = content['pages']
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request = self.req.get('/paginator/?page=%d' % num_pages)
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response = MockPaginatorView.as_view()(request)
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content = json.loads(response.content)
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self.assertEqual(response.status_code, status.OK)
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self.assertEqual(range(MockPaginatorView.limit*(num_pages-1), MockPaginatorView.total), content['results'])
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request = self.req.get('/paginator/?page=%d' % (num_pages + 1,))
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response = MockPaginatorView.as_view()(request)
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content = json.loads(response.content)
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self.assertEqual(response.status_code, status.NOT_FOUND)
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