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django-rest-framework/tests/test_pagination.py
fdomain f1a11d41cb
fix: fallback on CursorPagination ordering if unset on the view (#8954) 
* this commit fixes the usage of a CursorPagination combined with a view
  implementing an ordering filter, without a default ordering value.
* former behavior was to fetch the ordering value from the filter, and
  raises an error if the value was None, preventing the fallback on the
  ordering set on the CursorPagination class itself.
* we reversed the logic by getting first the value set on the class,
  and override it by the ordering filter if the parameter is present
2023-05-02 06:55:59 +06:00

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import pytest
from django.core.paginator import Paginator as DjangoPaginator
from django.db import models
from django.test import TestCase
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_method(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_method(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_method(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()
@pytest.mark.parametrize('url', ['/', '/?page='])
def test_no_page_number(self, url):
request = Request(factory.get(url))
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(), str)
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)
def test_get_paginated_response_schema(self):
unpaginated_schema = {
'type': 'object',
'item': {
'properties': {
'test-property': {
'type': 'integer',
},
},
},
}
assert self.pagination.get_paginated_response_schema(unpaginated_schema) == {
'type': 'object',
'properties': {
'count': {
'type': 'integer',
'example': 123,
},
'next': {
'type': 'string',
'nullable': True,
'format': 'uri',
'example': 'http://api.example.org/accounts/?page=4',
},
'previous': {
'type': 'string',
'nullable': True,
'format': 'uri',
'example': 'http://api.example.org/accounts/?page=2',
},
'results': unpaginated_schema,
},
}
class TestPageNumberPaginationOverride:
"""
Unit tests for `pagination.PageNumberPagination`.
the Django Paginator Class is overridden.
"""
def setup_method(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(), str)
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_method(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(), str)
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={}&offset={}'.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={}&offset={}'.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={}'.format(max_limit)
next_url = base_url + '&offset={}'.format(next_offset)
prev_url = base_url + '&offset={}'.format(prev_offset)
assert queryset == list(range(51, 66))
assert content.get('next') == next_url
assert content.get('previous') == prev_url
def test_get_paginated_response_schema(self):
unpaginated_schema = {
'type': 'object',
'item': {
'properties': {
'test-property': {
'type': 'integer',
},
},
},
}
assert self.pagination.get_paginated_response_schema(unpaginated_schema) == {
'type': 'object',
'properties': {
'count': {
'type': 'integer',
'example': 123,
},
'next': {
'type': 'string',
'nullable': True,
'format': 'uri',
'example': 'http://api.example.org/accounts/?offset=400&limit=100',
},
'previous': {
'type': 'string',
'nullable': True,
'format': 'uri',
'example': 'http://api.example.org/accounts/?offset=200&limit=100',
},
'results': unpaginated_schema,
},
}
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_use_with_ordering_filter_without_ordering_default_value(self):
class MockView:
filter_backends = (filters.OrderingFilter,)
ordering_fields = ['username', 'created']
request = Request(factory.get('/'))
ordering = self.pagination.get_ordering(request, [], MockView())
# it gets the value of `ordering` provided by CursorPagination
assert ordering == ('created',)
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(), str)
def test_cursor_pagination_current_page_empty_forward(self):
# Regression test for #6504
self.pagination.base_url = "/"
# We have a cursor on the element at position 100, but this element doesn't exist
# anymore.
cursor = pagination.Cursor(reverse=False, offset=0, position=100)
url = self.pagination.encode_cursor(cursor)
self.pagination.base_url = "/"
# Loading the page with this cursor doesn't crash
(previous, current, next, previous_url, next_url) = self.get_pages(url)
# The previous url doesn't crash either
(previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
# And point to things that are not completely off.
assert previous == [7, 7, 7, 8, 9]
assert current == [9, 9, 9, 9, 9]
assert next == []
assert previous_url is not None
assert next_url is not None
def test_cursor_pagination_current_page_empty_reverse(self):
# Regression test for #6504
self.pagination.base_url = "/"
# We have a cursor on the element at position 100, but this element doesn't exist
# anymore.
cursor = pagination.Cursor(reverse=True, offset=0, position=100)
url = self.pagination.encode_cursor(cursor)
self.pagination.base_url = "/"
# Loading the page with this cursor doesn't crash
(previous, current, next, previous_url, next_url) = self.get_pages(url)
# The previous url doesn't crash either
(previous, current, next, previous_url, next_url) = self.get_pages(next_url)
# And point to things that are not completely off.
assert previous == [7, 7, 7, 7, 8]
assert current == []
assert next is None
assert previous_url is not None
assert next_url is None
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]
def test_get_paginated_response_schema(self):
unpaginated_schema = {
'type': 'object',
'item': {
'properties': {
'test-property': {
'type': 'integer',
},
},
},
}
assert self.pagination.get_paginated_response_schema(unpaginated_schema) == {
'type': 'object',
'properties': {
'next': {
'type': 'string',
'nullable': True,
'format': 'uri',
'example': 'http://api.example.org/accounts/?cursor=cD00ODY%3D"'
},
'previous': {
'type': 'string',
'nullable': True,
'format': 'uri',
'example': 'http://api.example.org/accounts/?cursor=cj0xJnA9NDg3'
},
'results': unpaginated_schema,
},
}
class TestCursorPagination(CursorPaginationTestsMixin):
"""
Unit tests for `pagination.CursorPagination`.
"""
def setup_method(self):
class MockObject:
def __init__(self, idx):
self.created = idx
class MockQuerySet:
def __init__(self, items):
self.items = items
def filter(self, q):
q_args = dict(q.deconstruct()[1])
if not q_args:
# django 3.0.x artifact
q_args = dict(q.deconstruct()[2])
created__gt = q_args.get('created__gt')
created__lt = q_args.get('created__lt')
if created__gt is not None:
return MockQuerySet([
item for item in self.items
if item.created is None or item.created > int(created__gt)
])
assert created__lt is not None
return MockQuerySet([
item for item in self.items
if item.created is None or 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)
class NullableCursorPaginationModel(models.Model):
created = models.IntegerField(null=True)
class TestCursorPaginationWithNulls(TestCase):
"""
Unit tests for `pagination.CursorPagination` with ordering on a nullable field.
"""
def setUp(self):
class ExamplePagination(pagination.CursorPagination):
page_size = 1
ordering = 'created'
self.pagination = ExamplePagination()
data = [
None, None, 3, 4
]
for idx in data:
NullableCursorPaginationModel.objects.create(created=idx)
self.queryset = NullableCursorPaginationModel.objects.all()
get_pages = TestCursorPagination.get_pages
def test_ascending(self):
"""Test paginating one row at a time, current should go 1, 2, 3, 4, 3, 2, 1."""
(previous, current, next, previous_url, next_url) = self.get_pages('/')
assert previous is None
assert current == [None]
assert next == [None]
(previous, current, next, previous_url, next_url) = self.get_pages(next_url)
assert previous == [None]
assert current == [None]
assert next == [3]
(previous, current, next, previous_url, next_url) = self.get_pages(next_url)
assert previous == [3] # [None] paging artifact documented at https://github.com/ddelange/django-rest-framework/blob/3.14.0/rest_framework/pagination.py#L789
assert current == [3]
assert next == [4]
(previous, current, next, previous_url, next_url) = self.get_pages(next_url)
assert previous == [3]
assert current == [4]
assert next is None
assert next_url is None
(previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
assert previous == [None]
assert current == [3]
assert next == [4]
(previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
assert previous == [None]
assert current == [None]
assert next == [None] # [3] paging artifact documented at https://github.com/ddelange/django-rest-framework/blob/3.14.0/rest_framework/pagination.py#L731
(previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
assert previous is None
assert current == [None]
assert next == [None]
def test_descending(self):
"""Test paginating one row at a time, current should go 4, 3, 2, 1, 2, 3, 4."""
self.pagination.ordering = ('-created',)
(previous, current, next, previous_url, next_url) = self.get_pages('/')
assert previous is None
assert current == [4]
assert next == [3]
(previous, current, next, previous_url, next_url) = self.get_pages(next_url)
assert previous == [None] # [4] paging artifact
assert current == [3]
assert next == [None]
(previous, current, next, previous_url, next_url) = self.get_pages(next_url)
assert previous == [None] # [3] paging artifact
assert current == [None]
assert next == [None]
(previous, current, next, previous_url, next_url) = self.get_pages(next_url)
assert previous == [None]
assert current == [None]
assert next is None
assert next_url is None
(previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
assert previous == [3]
assert current == [None]
assert next == [None]
(previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
assert previous == [None]
assert current == [3]
assert next == [3] # [4] paging artifact documented at https://github.com/ddelange/django-rest-framework/blob/3.14.0/rest_framework/pagination.py#L731
# skip back artifact
(previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
(previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
(previous, current, next, previous_url, next_url) = self.get_pages(previous_url)
assert previous is None
assert current == [4]
assert next == [3]
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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