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django-rest-framework/tests/test_pagination.py
Jon Dufresne 9d06e43d05 Replace type('') with six.text_type (#6482) 
As all source files import unicode_literals, type('') is always
equivalent to six.text_type (str on Python 3 and unicode on Python 2).
Removes the need to call type(), is more explicit, and will be easier to
catch places to change for when it is time to eventually drop Python 2.
2019-03-05 12:11:46 +01:00

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# coding: utf-8
from __future__ import unicode_literals
import pytest
from django.core.paginator import Paginator as DjangoPaginator
from django.db import models
from django.test import TestCase
from django.utils import six
from rest_framework import (
exceptions, filters, generics, pagination, serializers, status
)
from rest_framework.pagination import PAGE_BREAK, PageLink
from rest_framework.request import Request
from rest_framework.test import APIRequestFactory
factory = APIRequestFactory()
class TestPaginationIntegration:
"""
Integration tests.
"""
def setup(self):
class PassThroughSerializer(serializers.BaseSerializer):
def to_representation(self, item):
return item
class EvenItemsOnly(filters.BaseFilterBackend):
def filter_queryset(self, request, queryset, view):
return [item for item in queryset if item % 2 == 0]
class BasicPagination(pagination.PageNumberPagination):
page_size = 5
page_size_query_param = 'page_size'
max_page_size = 20
self.view = generics.ListAPIView.as_view(
serializer_class=PassThroughSerializer,
queryset=range(1, 101),
filter_backends=[EvenItemsOnly],
pagination_class=BasicPagination
)
def test_filtered_items_are_paginated(self):
request = factory.get('/', {'page': 2})
response = self.view(request)
assert response.status_code == status.HTTP_200_OK
assert response.data == {
'results': [12, 14, 16, 18, 20],
'previous': 'http://testserver/',
'next': 'http://testserver/?page=3',
'count': 50
}
def test_setting_page_size(self):
"""
When 'paginate_by_param' is set, the client may choose a page size.
"""
request = factory.get('/', {'page_size': 10})
response = self.view(request)
assert response.status_code == status.HTTP_200_OK
assert response.data == {
'results': [2, 4, 6, 8, 10, 12, 14, 16, 18, 20],
'previous': None,
'next': 'http://testserver/?page=2&page_size=10',
'count': 50
}
def test_setting_page_size_over_maximum(self):
"""
When page_size parameter exceeds maximum allowable,
then it should be capped to the maximum.
"""
request = factory.get('/', {'page_size': 1000})
response = self.view(request)
assert response.status_code == status.HTTP_200_OK
assert response.data == {
'results': [
2, 4, 6, 8, 10, 12, 14, 16, 18, 20,
22, 24, 26, 28, 30, 32, 34, 36, 38, 40
],
'previous': None,
'next': 'http://testserver/?page=2&page_size=1000',
'count': 50
}
def test_setting_page_size_to_zero(self):
"""
When page_size parameter is invalid it should return to the default.
"""
request = factory.get('/', {'page_size': 0})
response = self.view(request)
assert response.status_code == status.HTTP_200_OK
assert response.data == {
'results': [2, 4, 6, 8, 10],
'previous': None,
'next': 'http://testserver/?page=2&page_size=0',
'count': 50
}
def test_additional_query_params_are_preserved(self):
request = factory.get('/', {'page': 2, 'filter': 'even'})
response = self.view(request)
assert response.status_code == status.HTTP_200_OK
assert response.data == {
'results': [12, 14, 16, 18, 20],
'previous': 'http://testserver/?filter=even',
'next': 'http://testserver/?filter=even&page=3',
'count': 50
}
def test_empty_query_params_are_preserved(self):
request = factory.get('/', {'page': 2, 'filter': ''})
response = self.view(request)
assert response.status_code == status.HTTP_200_OK
assert response.data == {
'results': [12, 14, 16, 18, 20],
'previous': 'http://testserver/?filter=',
'next': 'http://testserver/?filter=&page=3',
'count': 50
}
def test_404_not_found_for_zero_page(self):
request = factory.get('/', {'page': '0'})
response = self.view(request)
assert response.status_code == status.HTTP_404_NOT_FOUND
assert response.data == {
'detail': 'Invalid page.'
}
def test_404_not_found_for_invalid_page(self):
request = factory.get('/', {'page': 'invalid'})
response = self.view(request)
assert response.status_code == status.HTTP_404_NOT_FOUND
assert response.data == {
'detail': 'Invalid page.'
}
class TestPaginationDisabledIntegration:
"""
Integration tests for disabled pagination.
"""
def setup(self):
class PassThroughSerializer(serializers.BaseSerializer):
def to_representation(self, item):
return item
self.view = generics.ListAPIView.as_view(
serializer_class=PassThroughSerializer,
queryset=range(1, 101),
pagination_class=None
)
def test_unpaginated_list(self):
request = factory.get('/', {'page': 2})
response = self.view(request)
assert response.status_code == status.HTTP_200_OK
assert response.data == list(range(1, 101))
class TestPageNumberPagination:
"""
Unit tests for `pagination.PageNumberPagination`.
"""
def setup(self):
class ExamplePagination(pagination.PageNumberPagination):
page_size = 5
self.pagination = ExamplePagination()
self.queryset = range(1, 101)
def paginate_queryset(self, request):
return list(self.pagination.paginate_queryset(self.queryset, request))
def get_paginated_content(self, queryset):
response = self.pagination.get_paginated_response(queryset)
return response.data
def get_html_context(self):
return self.pagination.get_html_context()
def test_no_page_number(self):
request = Request(factory.get('/'))
queryset = self.paginate_queryset(request)
content = self.get_paginated_content(queryset)
context = self.get_html_context()
assert queryset == [1, 2, 3, 4, 5]
assert content == {
'results': [1, 2, 3, 4, 5],
'previous': None,
'next': 'http://testserver/?page=2',
'count': 100
}
assert context == {
'previous_url': None,
'next_url': 'http://testserver/?page=2',
'page_links': [
PageLink('http://testserver/', 1, True, False),
PageLink('http://testserver/?page=2', 2, False, False),
PageLink('http://testserver/?page=3', 3, False, False),
PAGE_BREAK,
PageLink('http://testserver/?page=20', 20, False, False),
]
}
assert self.pagination.display_page_controls
assert isinstance(self.pagination.to_html(), six.text_type)
def test_second_page(self):
request = Request(factory.get('/', {'page': 2}))
queryset = self.paginate_queryset(request)
content = self.get_paginated_content(queryset)
context = self.get_html_context()
assert queryset == [6, 7, 8, 9, 10]
assert content == {
'results': [6, 7, 8, 9, 10],
'previous': 'http://testserver/',
'next': 'http://testserver/?page=3',
'count': 100
}
assert context == {
'previous_url': 'http://testserver/',
'next_url': 'http://testserver/?page=3',
'page_links': [
PageLink('http://testserver/', 1, False, False),
PageLink('http://testserver/?page=2', 2, True, False),
PageLink('http://testserver/?page=3', 3, False, False),
PAGE_BREAK,
PageLink('http://testserver/?page=20', 20, False, False),
]
}
def test_last_page(self):
request = Request(factory.get('/', {'page': 'last'}))
queryset = self.paginate_queryset(request)
content = self.get_paginated_content(queryset)
context = self.get_html_context()
assert queryset == [96, 97, 98, 99, 100]
assert content == {
'results': [96, 97, 98, 99, 100],
'previous': 'http://testserver/?page=19',
'next': None,
'count': 100
}
assert context == {
'previous_url': 'http://testserver/?page=19',
'next_url': None,
'page_links': [
PageLink('http://testserver/', 1, False, False),
PAGE_BREAK,
PageLink('http://testserver/?page=18', 18, False, False),
PageLink('http://testserver/?page=19', 19, False, False),
PageLink('http://testserver/?page=20', 20, True, False),
]
}
def test_invalid_page(self):
request = Request(factory.get('/', {'page': 'invalid'}))
with pytest.raises(exceptions.NotFound):
self.paginate_queryset(request)
class TestPageNumberPaginationOverride:
"""
Unit tests for `pagination.PageNumberPagination`.
the Django Paginator Class is overridden.
"""
def setup(self):
class OverriddenDjangoPaginator(DjangoPaginator):
# override the count in our overridden Django Paginator
# we will only return one page, with one item
count = 1
class ExamplePagination(pagination.PageNumberPagination):
django_paginator_class = OverriddenDjangoPaginator
page_size = 5
self.pagination = ExamplePagination()
self.queryset = range(1, 101)
def paginate_queryset(self, request):
return list(self.pagination.paginate_queryset(self.queryset, request))
def get_paginated_content(self, queryset):
response = self.pagination.get_paginated_response(queryset)
return response.data
def get_html_context(self):
return self.pagination.get_html_context()
def test_no_page_number(self):
request = Request(factory.get('/'))
queryset = self.paginate_queryset(request)
content = self.get_paginated_content(queryset)
context = self.get_html_context()
assert queryset == [1]
assert content == {
'results': [1, ],
'previous': None,
'next': None,
'count': 1
}
assert context == {
'previous_url': None,
'next_url': None,
'page_links': [
PageLink('http://testserver/', 1, True, False),
]
}
assert not self.pagination.display_page_controls
assert isinstance(self.pagination.to_html(), six.text_type)
def test_invalid_page(self):
request = Request(factory.get('/', {'page': 'invalid'}))
with pytest.raises(exceptions.NotFound):
self.paginate_queryset(request)
class TestLimitOffset:
"""
Unit tests for `pagination.LimitOffsetPagination`.
"""
def setup(self):
class ExamplePagination(pagination.LimitOffsetPagination):
default_limit = 10
max_limit = 15
self.pagination = ExamplePagination()
self.queryset = range(1, 101)
def paginate_queryset(self, request):
return list(self.pagination.paginate_queryset(self.queryset, request))
def get_paginated_content(self, queryset):
response = self.pagination.get_paginated_response(queryset)
return response.data
def get_html_context(self):
return self.pagination.get_html_context()
def test_no_offset(self):
request = Request(factory.get('/', {'limit': 5}))
queryset = self.paginate_queryset(request)
content = self.get_paginated_content(queryset)
context = self.get_html_context()
assert queryset == [1, 2, 3, 4, 5]
assert content == {
'results': [1, 2, 3, 4, 5],
'previous': None,
'next': 'http://testserver/?limit=5&offset=5',
'count': 100
}
assert context == {
'previous_url': None,
'next_url': 'http://testserver/?limit=5&offset=5',
'page_links': [
PageLink('http://testserver/?limit=5', 1, True, False),
PageLink('http://testserver/?limit=5&offset=5', 2, False, False),
PageLink('http://testserver/?limit=5&offset=10', 3, False, False),
PAGE_BREAK,
PageLink('http://testserver/?limit=5&offset=95', 20, False, False),
]
}
assert self.pagination.display_page_controls
assert isinstance(self.pagination.to_html(), six.text_type)
def test_pagination_not_applied_if_limit_or_default_limit_not_set(self):
class MockPagination(pagination.LimitOffsetPagination):
default_limit = None
request = Request(factory.get('/'))
queryset = MockPagination().paginate_queryset(self.queryset, request)
assert queryset is None
def test_single_offset(self):
"""
When the offset is not a multiple of the limit we get some edge cases:
* The first page should still be offset zero.
* We may end up displaying an extra page in the pagination control.
"""
request = Request(factory.get('/', {'limit': 5, 'offset': 1}))
queryset = self.paginate_queryset(request)
content = self.get_paginated_content(queryset)
context = self.get_html_context()
assert queryset == [2, 3, 4, 5, 6]
assert content == {
'results': [2, 3, 4, 5, 6],
'previous': 'http://testserver/?limit=5',
'next': 'http://testserver/?limit=5&offset=6',
'count': 100
}
assert context == {
'previous_url': 'http://testserver/?limit=5',
'next_url': 'http://testserver/?limit=5&offset=6',
'page_links': [
PageLink('http://testserver/?limit=5', 1, False, False),
PageLink('http://testserver/?limit=5&offset=1', 2, True, False),
PageLink('http://testserver/?limit=5&offset=6', 3, False, False),
PAGE_BREAK,
PageLink('http://testserver/?limit=5&offset=96', 21, False, False),
]
}
def test_first_offset(self):
request = Request(factory.get('/', {'limit': 5, 'offset': 5}))
queryset = self.paginate_queryset(request)
content = self.get_paginated_content(queryset)
context = self.get_html_context()
assert queryset == [6, 7, 8, 9, 10]
assert content == {
'results': [6, 7, 8, 9, 10],
'previous': 'http://testserver/?limit=5',
'next': 'http://testserver/?limit=5&offset=10',
'count': 100
}
assert context == {
'previous_url': 'http://testserver/?limit=5',
'next_url': 'http://testserver/?limit=5&offset=10',
'page_links': [
PageLink('http://testserver/?limit=5', 1, False, False),
PageLink('http://testserver/?limit=5&offset=5', 2, True, False),
PageLink('http://testserver/?limit=5&offset=10', 3, False, False),
PAGE_BREAK,
PageLink('http://testserver/?limit=5&offset=95', 20, False, False),
]
}
def test_middle_offset(self):
request = Request(factory.get('/', {'limit': 5, 'offset': 10}))
queryset = self.paginate_queryset(request)
content = self.get_paginated_content(queryset)
context = self.get_html_context()
assert queryset == [11, 12, 13, 14, 15]
assert content == {
'results': [11, 12, 13, 14, 15],
'previous': 'http://testserver/?limit=5&offset=5',
'next': 'http://testserver/?limit=5&offset=15',
'count': 100
}
assert context == {
'previous_url': 'http://testserver/?limit=5&offset=5',
'next_url': 'http://testserver/?limit=5&offset=15',
'page_links': [
PageLink('http://testserver/?limit=5', 1, False, False),
PageLink('http://testserver/?limit=5&offset=5', 2, False, False),
PageLink('http://testserver/?limit=5&offset=10', 3, True, False),
PageLink('http://testserver/?limit=5&offset=15', 4, False, False),
PAGE_BREAK,
PageLink('http://testserver/?limit=5&offset=95', 20, False, False),
]
}
def test_ending_offset(self):
request = Request(factory.get('/', {'limit': 5, 'offset': 95}))
queryset = self.paginate_queryset(request)
content = self.get_paginated_content(queryset)
context = self.get_html_context()
assert queryset == [96, 97, 98, 99, 100]
assert content == {
'results': [96, 97, 98, 99, 100],
'previous': 'http://testserver/?limit=5&offset=90',
'next': None,
'count': 100
}
assert context == {
'previous_url': 'http://testserver/?limit=5&offset=90',
'next_url': None,
'page_links': [
PageLink('http://testserver/?limit=5', 1, False, False),
PAGE_BREAK,
PageLink('http://testserver/?limit=5&offset=85', 18, False, False),
PageLink('http://testserver/?limit=5&offset=90', 19, False, False),
PageLink('http://testserver/?limit=5&offset=95', 20, True, False),
]
}
def test_erronous_offset(self):
request = Request(factory.get('/', {'limit': 5, 'offset': 1000}))
queryset = self.paginate_queryset(request)
self.get_paginated_content(queryset)
self.get_html_context()
def test_invalid_offset(self):
"""
An invalid offset query param should be treated as 0.
"""
request = Request(factory.get('/', {'limit': 5, 'offset': 'invalid'}))
queryset = self.paginate_queryset(request)
assert queryset == [1, 2, 3, 4, 5]
def test_invalid_limit(self):
"""
An invalid limit query param should be ignored in favor of the default.
"""
request = Request(factory.get('/', {'limit': 'invalid', 'offset': 0}))
queryset = self.paginate_queryset(request)
content = self.get_paginated_content(queryset)
next_limit = self.pagination.default_limit
next_offset = self.pagination.default_limit
next_url = 'http://testserver/?limit={0}&offset={1}'.format(next_limit, next_offset)
assert queryset == [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
assert content.get('next') == next_url
def test_zero_limit(self):
"""
An zero limit query param should be ignored in favor of the default.
"""
request = Request(factory.get('/', {'limit': 0, 'offset': 0}))
queryset = self.paginate_queryset(request)
content = self.get_paginated_content(queryset)
next_limit = self.pagination.default_limit
next_offset = self.pagination.default_limit
next_url = 'http://testserver/?limit={0}&offset={1}'.format(next_limit, next_offset)
assert queryset == [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
assert content.get('next') == next_url
def test_max_limit(self):
"""
The limit defaults to the max_limit when there is a max_limit and the
requested limit is greater than the max_limit
"""
offset = 50
request = Request(factory.get('/', {'limit': '11235', 'offset': offset}))
queryset = self.paginate_queryset(request)
content = self.get_paginated_content(queryset)
max_limit = self.pagination.max_limit
next_offset = offset + max_limit
prev_offset = offset - max_limit
base_url = 'http://testserver/?limit={0}'.format(max_limit)
next_url = base_url + '&offset={0}'.format(next_offset)
prev_url = base_url + '&offset={0}'.format(prev_offset)
assert queryset == list(range(51, 66))
assert content.get('next') == next_url
assert content.get('previous') == prev_url
class CursorPaginationTestsMixin:
def test_invalid_cursor(self):
request = Request(factory.get('/', {'cursor': '123'}))
with pytest.raises(exceptions.NotFound):
self.pagination.paginate_queryset(self.queryset, request)
def test_use_with_ordering_filter(self):
class MockView:
filter_backends = (filters.OrderingFilter,)
ordering_fields = ['username', 'created']
ordering = 'created'
request = Request(factory.get('/', {'ordering': 'username'}))
ordering = self.pagination.get_ordering(request, [], MockView())
assert ordering == ('username',)
request = Request(factory.get('/', {'ordering': '-username'}))
ordering = self.pagination.get_ordering(request, [], MockView())
assert ordering == ('-username',)
request = Request(factory.get('/', {'ordering': 'invalid'}))
ordering = self.pagination.get_ordering(request, [], MockView())
assert ordering == ('created',)
def test_cursor_pagination(self):
(previous, current, next, previous_url, next_url) = self.get_pages('/')
assert previous is None
assert current == [1, 1, 1, 1, 1]
assert next == [1, 2, 3, 4, 4]
(previous, current, next, previous_url, next_url) = self.get_pages(next_url)
assert previous == [1, 1, 1, 1, 1]
assert current == [1, 2, 3, 4, 4]
assert next == [4, 4, 5, 6, 7]
(previous, current, next, previous_url, next_url) = self.get_pages(next_url)
assert previous == [1, 2, 3, 4, 4]
assert current == [4, 4, 5, 6, 7]
assert next == [7, 7, 7, 7, 7]
(previous, current, next, previous_url, next_url) = self.get_pages(next_url)
assert previous == [4, 4, 4, 5, 6] # Paging artifact
assert current == [7, 7, 7, 7, 7]
assert next == [7, 7, 7, 8, 9]
(previous, current, next, previous_url, next_url) = self.get_pages(next_url)
assert previous == [7, 7, 7, 7, 7]
assert current == [7, 7, 7, 8, 9]
assert next == [9, 9, 9, 9, 9]
(previous, current, next, previous_url, next_url) = self.get_pages(next_url)
assert previous == [7, 7, 7, 8, 9]
assert current == [9, 9, 9, 9, 9]
assert next is None
(previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
assert previous == [7, 7, 7, 7, 7]
assert current == [7, 7, 7, 8, 9]
assert next == [9, 9, 9, 9, 9]
(previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
assert previous == [4, 4, 5, 6, 7]
assert current == [7, 7, 7, 7, 7]
assert next == [8, 9, 9, 9, 9] # Paging artifact
(previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
assert previous == [1, 2, 3, 4, 4]
assert current == [4, 4, 5, 6, 7]
assert next == [7, 7, 7, 7, 7]
(previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
assert previous == [1, 1, 1, 1, 1]
assert current == [1, 2, 3, 4, 4]
assert next == [4, 4, 5, 6, 7]
(previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
assert previous is None
assert current == [1, 1, 1, 1, 1]
assert next == [1, 2, 3, 4, 4]
assert isinstance(self.pagination.to_html(), six.text_type)
def test_cursor_pagination_with_page_size(self):
(previous, current, next, previous_url, next_url) = self.get_pages('/?page_size=20')
assert previous is None
assert current == [1, 1, 1, 1, 1, 1, 2, 3, 4, 4, 4, 4, 5, 6, 7, 7, 7, 7, 7, 7]
assert next == [7, 7, 7, 8, 9, 9, 9, 9, 9, 9]
(previous, current, next, previous_url, next_url) = self.get_pages(next_url)
assert previous == [1, 1, 1, 1, 1, 1, 2, 3, 4, 4, 4, 4, 5, 6, 7, 7, 7, 7, 7, 7]
assert current == [7, 7, 7, 8, 9, 9, 9, 9, 9, 9]
assert next is None
def test_cursor_pagination_with_page_size_over_limit(self):
(previous, current, next, previous_url, next_url) = self.get_pages('/?page_size=30')
assert previous is None
assert current == [1, 1, 1, 1, 1, 1, 2, 3, 4, 4, 4, 4, 5, 6, 7, 7, 7, 7, 7, 7]
assert next == [7, 7, 7, 8, 9, 9, 9, 9, 9, 9]
(previous, current, next, previous_url, next_url) = self.get_pages(next_url)
assert previous == [1, 1, 1, 1, 1, 1, 2, 3, 4, 4, 4, 4, 5, 6, 7, 7, 7, 7, 7, 7]
assert current == [7, 7, 7, 8, 9, 9, 9, 9, 9, 9]
assert next is None
def test_cursor_pagination_with_page_size_zero(self):
(previous, current, next, previous_url, next_url) = self.get_pages('/?page_size=0')
assert previous is None
assert current == [1, 1, 1, 1, 1]
assert next == [1, 2, 3, 4, 4]
(previous, current, next, previous_url, next_url) = self.get_pages(next_url)
assert previous == [1, 1, 1, 1, 1]
assert current == [1, 2, 3, 4, 4]
assert next == [4, 4, 5, 6, 7]
(previous, current, next, previous_url, next_url) = self.get_pages(next_url)
assert previous == [1, 2, 3, 4, 4]
assert current == [4, 4, 5, 6, 7]
assert next == [7, 7, 7, 7, 7]
(previous, current, next, previous_url, next_url) = self.get_pages(next_url)
assert previous == [4, 4, 4, 5, 6] # Paging artifact
assert current == [7, 7, 7, 7, 7]
assert next == [7, 7, 7, 8, 9]
(previous, current, next, previous_url, next_url) = self.get_pages(next_url)
assert previous == [7, 7, 7, 7, 7]
assert current == [7, 7, 7, 8, 9]
assert next == [9, 9, 9, 9, 9]
(previous, current, next, previous_url, next_url) = self.get_pages(next_url)
assert previous == [7, 7, 7, 8, 9]
assert current == [9, 9, 9, 9, 9]
assert next is None
(previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
assert previous == [7, 7, 7, 7, 7]
assert current == [7, 7, 7, 8, 9]
assert next == [9, 9, 9, 9, 9]
(previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
assert previous == [4, 4, 5, 6, 7]
assert current == [7, 7, 7, 7, 7]
assert next == [8, 9, 9, 9, 9] # Paging artifact
(previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
assert previous == [1, 2, 3, 4, 4]
assert current == [4, 4, 5, 6, 7]
assert next == [7, 7, 7, 7, 7]
(previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
assert previous == [1, 1, 1, 1, 1]
assert current == [1, 2, 3, 4, 4]
assert next == [4, 4, 5, 6, 7]
(previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
assert previous is None
assert current == [1, 1, 1, 1, 1]
assert next == [1, 2, 3, 4, 4]
def test_cursor_pagination_with_page_size_negative(self):
(previous, current, next, previous_url, next_url) = self.get_pages('/?page_size=-5')
assert previous is None
assert current == [1, 1, 1, 1, 1]
assert next == [1, 2, 3, 4, 4]
(previous, current, next, previous_url, next_url) = self.get_pages(next_url)
assert previous == [1, 1, 1, 1, 1]
assert current == [1, 2, 3, 4, 4]
assert next == [4, 4, 5, 6, 7]
(previous, current, next, previous_url, next_url) = self.get_pages(next_url)
assert previous == [1, 2, 3, 4, 4]
assert current == [4, 4, 5, 6, 7]
assert next == [7, 7, 7, 7, 7]
(previous, current, next, previous_url, next_url) = self.get_pages(next_url)
assert previous == [4, 4, 4, 5, 6] # Paging artifact
assert current == [7, 7, 7, 7, 7]
assert next == [7, 7, 7, 8, 9]
(previous, current, next, previous_url, next_url) = self.get_pages(next_url)
assert previous == [7, 7, 7, 7, 7]
assert current == [7, 7, 7, 8, 9]
assert next == [9, 9, 9, 9, 9]
(previous, current, next, previous_url, next_url) = self.get_pages(next_url)
assert previous == [7, 7, 7, 8, 9]
assert current == [9, 9, 9, 9, 9]
assert next is None
(previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
assert previous == [7, 7, 7, 7, 7]
assert current == [7, 7, 7, 8, 9]
assert next == [9, 9, 9, 9, 9]
(previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
assert previous == [4, 4, 5, 6, 7]
assert current == [7, 7, 7, 7, 7]
assert next == [8, 9, 9, 9, 9] # Paging artifact
(previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
assert previous == [1, 2, 3, 4, 4]
assert current == [4, 4, 5, 6, 7]
assert next == [7, 7, 7, 7, 7]
(previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
assert previous == [1, 1, 1, 1, 1]
assert current == [1, 2, 3, 4, 4]
assert next == [4, 4, 5, 6, 7]
(previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
assert previous is None
assert current == [1, 1, 1, 1, 1]
assert next == [1, 2, 3, 4, 4]
class TestCursorPagination(CursorPaginationTestsMixin):
"""
Unit tests for `pagination.CursorPagination`.
"""
def setup(self):
class MockObject(object):
def __init__(self, idx):
self.created = idx
class MockQuerySet(object):
def __init__(self, items):
self.items = items
def filter(self, created__gt=None, created__lt=None):
if created__gt is not None:
return MockQuerySet([
item for item in self.items
if item.created > int(created__gt)
])
assert created__lt is not None
return MockQuerySet([
item for item in self.items
if item.created < int(created__lt)
])
def order_by(self, *ordering):
if ordering[0].startswith('-'):
return MockQuerySet(list(reversed(self.items)))
return self
def __getitem__(self, sliced):
return self.items[sliced]
class ExamplePagination(pagination.CursorPagination):
page_size = 5
page_size_query_param = 'page_size'
max_page_size = 20
ordering = 'created'
self.pagination = ExamplePagination()
self.queryset = MockQuerySet([
MockObject(idx) for idx in [
1, 1, 1, 1, 1,
1, 2, 3, 4, 4,
4, 4, 5, 6, 7,
7, 7, 7, 7, 7,
7, 7, 7, 8, 9,
9, 9, 9, 9, 9
]
])
def get_pages(self, url):
"""
Given a URL return a tuple of:
(previous page, current page, next page, previous url, next url)
"""
request = Request(factory.get(url))
queryset = self.pagination.paginate_queryset(self.queryset, request)
current = [item.created for item in queryset]
next_url = self.pagination.get_next_link()
previous_url = self.pagination.get_previous_link()
if next_url is not None:
request = Request(factory.get(next_url))
queryset = self.pagination.paginate_queryset(self.queryset, request)
next = [item.created for item in queryset]
else:
next = None
if previous_url is not None:
request = Request(factory.get(previous_url))
queryset = self.pagination.paginate_queryset(self.queryset, request)
previous = [item.created for item in queryset]
else:
previous = None
return (previous, current, next, previous_url, next_url)
class CursorPaginationModel(models.Model):
created = models.IntegerField()
class TestCursorPaginationWithValueQueryset(CursorPaginationTestsMixin, TestCase):
"""
Unit tests for `pagination.CursorPagination` for value querysets.
"""
def setUp(self):
class ExamplePagination(pagination.CursorPagination):
page_size = 5
page_size_query_param = 'page_size'
max_page_size = 20
ordering = 'created'
self.pagination = ExamplePagination()
data = [
1, 1, 1, 1, 1,
1, 2, 3, 4, 4,
4, 4, 5, 6, 7,
7, 7, 7, 7, 7,
7, 7, 7, 8, 9,
9, 9, 9, 9, 9
]
for idx in data:
CursorPaginationModel.objects.create(created=idx)
self.queryset = CursorPaginationModel.objects.values()
def get_pages(self, url):
"""
Given a URL return a tuple of:
(previous page, current page, next page, previous url, next url)
"""
request = Request(factory.get(url))
queryset = self.pagination.paginate_queryset(self.queryset, request)
current = [item['created'] for item in queryset]
next_url = self.pagination.get_next_link()
previous_url = self.pagination.get_previous_link()
if next_url is not None:
request = Request(factory.get(next_url))
queryset = self.pagination.paginate_queryset(self.queryset, request)
next = [item['created'] for item in queryset]
else:
next = None
if previous_url is not None:
request = Request(factory.get(previous_url))
queryset = self.pagination.paginate_queryset(self.queryset, request)
previous = [item['created'] for item in queryset]
else:
previous = None
return (previous, current, next, previous_url, next_url)
def test_get_displayed_page_numbers():
"""
Test our contextual page display function.
This determines which pages to display in a pagination control,
given the current page and the last page.
"""
displayed_page_numbers = pagination._get_displayed_page_numbers
# At five pages or less, all pages are displayed, always.
assert displayed_page_numbers(1, 5) == [1, 2, 3, 4, 5]
assert displayed_page_numbers(2, 5) == [1, 2, 3, 4, 5]
assert displayed_page_numbers(3, 5) == [1, 2, 3, 4, 5]
assert displayed_page_numbers(4, 5) == [1, 2, 3, 4, 5]
assert displayed_page_numbers(5, 5) == [1, 2, 3, 4, 5]
# Between six and either pages we may have a single page break.
assert displayed_page_numbers(1, 6) == [1, 2, 3, None, 6]
assert displayed_page_numbers(2, 6) == [1, 2, 3, None, 6]
assert displayed_page_numbers(3, 6) == [1, 2, 3, 4, 5, 6]
assert displayed_page_numbers(4, 6) == [1, 2, 3, 4, 5, 6]
assert displayed_page_numbers(5, 6) == [1, None, 4, 5, 6]
assert displayed_page_numbers(6, 6) == [1, None, 4, 5, 6]
assert displayed_page_numbers(1, 7) == [1, 2, 3, None, 7]
assert displayed_page_numbers(2, 7) == [1, 2, 3, None, 7]
assert displayed_page_numbers(3, 7) == [1, 2, 3, 4, None, 7]
assert displayed_page_numbers(4, 7) == [1, 2, 3, 4, 5, 6, 7]
assert displayed_page_numbers(5, 7) == [1, None, 4, 5, 6, 7]
assert displayed_page_numbers(6, 7) == [1, None, 5, 6, 7]
assert displayed_page_numbers(7, 7) == [1, None, 5, 6, 7]
assert displayed_page_numbers(1, 8) == [1, 2, 3, None, 8]
assert displayed_page_numbers(2, 8) == [1, 2, 3, None, 8]
assert displayed_page_numbers(3, 8) == [1, 2, 3, 4, None, 8]
assert displayed_page_numbers(4, 8) == [1, 2, 3, 4, 5, None, 8]
assert displayed_page_numbers(5, 8) == [1, None, 4, 5, 6, 7, 8]
assert displayed_page_numbers(6, 8) == [1, None, 5, 6, 7, 8]
assert displayed_page_numbers(7, 8) == [1, None, 6, 7, 8]
assert displayed_page_numbers(8, 8) == [1, None, 6, 7, 8]
# At nine or more pages we may have two page breaks, one on each side.
assert displayed_page_numbers(1, 9) == [1, 2, 3, None, 9]
assert displayed_page_numbers(2, 9) == [1, 2, 3, None, 9]
assert displayed_page_numbers(3, 9) == [1, 2, 3, 4, None, 9]
assert displayed_page_numbers(4, 9) == [1, 2, 3, 4, 5, None, 9]
assert displayed_page_numbers(5, 9) == [1, None, 4, 5, 6, None, 9]
assert displayed_page_numbers(6, 9) == [1, None, 5, 6, 7, 8, 9]
assert displayed_page_numbers(7, 9) == [1, None, 6, 7, 8, 9]
assert displayed_page_numbers(8, 9) == [1, None, 7, 8, 9]
assert displayed_page_numbers(9, 9) == [1, None, 7, 8, 9]
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