Merge pull request #3147 from tomchristie/uploadcare-cursor-limits

Add `get_page_size` hook to `CursorPagination`

rest_framework/pagination.py

@@ -455,7 +455,8 @@ class CursorPagination(BasePagination):
     template = 'rest_framework/pagination/previous_and_next.html'
 
     def paginate_queryset(self, queryset, request, view=None):
-        if self.page_size is None:
+        page_size = self.get_page_size(request)
+        if not page_size:
             return None
 
         self.base_url = request.build_absolute_uri()
@@ -490,8 +491,8 @@ class CursorPagination(BasePagination):
         # If we have an offset cursor then offset the entire page by that amount.
         # We also always fetch an extra item in order to determine if there is a
         # page following on from this one.
-        results = list(queryset[offset:offset + self.page_size + 1])
-        self.page = list(results[:self.page_size])
+        results = list(queryset[offset:offset + page_size + 1])
+        self.page = list(results[:page_size])
 
         # Determine the position of the final item following the page.
         if len(results) > len(self.page):
@@ -530,6 +531,9 @@ class CursorPagination(BasePagination):
 
         return self.page
 
+    def get_page_size(self, request):
+        return self.page_size
+
     def get_next_link(self):
         if not self.has_next:
             return None