Add get_page_size hook to CursorPagination. Closes #3068.

rest_framework/pagination.py

@@ -454,14 +454,6 @@ class CursorPagination(BasePagination):
     # Defaults to `None`, meaning pagination is disabled.
     page_size = api_settings.PAGE_SIZE
 
-    # Client can control the page size using this query parameter.
-    # Default is 'None'. Set to eg 'page_size' to enable usage.
-    page_size_query_param = None
-
-    # Set to an integer to limit the maximum page size the client may request.
-    # Only relevant if 'page_size_query_param' has also been set.
-    max_page_size = None
-
     invalid_cursor_message = _('Invalid cursor')
     ordering = '-created'
     template = 'rest_framework/pagination/previous_and_next.html'
@@ -544,16 +536,6 @@ class CursorPagination(BasePagination):
         return self.page
 
     def get_page_size(self, request):
-        if self.page_size_query_param:
-            try:
-                return _positive_int(
-                    request.query_params[self.page_size_query_param],
-                    strict=True,
-                    cutoff=self.max_page_size
-                )
-            except (KeyError, ValueError):
-                pass
-
         return self.page_size
 
     def get_next_link(self):

tests/test_pagination.py

@@ -513,8 +513,6 @@ class TestCursorPagination:
 
         class ExamplePagination(pagination.CursorPagination):
             page_size = 5
-            page_size_query_param = 'page_size'
-            max_page_size = 20
             ordering = 'created'
 
         self.pagination = ExamplePagination()
@@ -650,24 +648,6 @@ class TestCursorPagination:
 
         assert isinstance(self.pagination.to_html(), type(''))
 
-    def test_page_size(self):
-        (previous, current, next, previous_url, next_url) = \
-            self.get_pages('/?page_size=10')
-
-        assert previous is None
-        assert current == [1, 1, 1, 1, 1, 1, 2, 3, 4, 4]
-        assert next == [4, 4, 5, 6, 7, 7, 7, 7, 7, 7]
-        assert 'page_size=10' in next_url
-
-        (previous, current, next, previous_url, next_url) = \
-            self.get_pages(next_url.replace('page_size=10', 'page_size=4'))
-
-        assert previous == [2, 3, 4, 4]
-        assert current == [4, 4, 5, 6]
-        assert next == [7, 7, 7, 7]
-        assert 'page_size=4' in previous_url
-        assert 'page_size=4' in next_url
-
 
 def test_get_displayed_page_numbers():
     """