feat: Use default pagination class for v2 library views (openedx#34879)

This ensures `num_pages` is included in paginated response.

openedx/core/djangoapps/content_libraries/tests/test_content_libraries.py

@@ -137,7 +137,7 @@ def test_library_validation(self):
         }
 
     @skip("This endpoint shouldn't support num_blocks and has_unpublished_*.")
-    @patch("openedx.core.djangoapps.content_libraries.views.LibraryApiPagination.page_size", new=2)
+    @patch("openedx.core.djangoapps.content_libraries.views.LibraryRootView.pagination_class.page_size", new=2)
     def test_list_library(self):
         """
         Test the /libraries API and its pagination
@@ -374,7 +374,7 @@ def test_library_blocks_studio_view(self):
         assert 'resources' in fragment
         assert 'Hello world!' in fragment['content']
 
-    @patch("openedx.core.djangoapps.content_libraries.views.LibraryApiPagination.page_size", new=2)
+    @patch("openedx.core.djangoapps.content_libraries.views.LibraryBlocksView.pagination_class.page_size", new=2)
     def test_list_library_blocks(self):
         """
         Test the /libraries/{lib_key_str}/blocks API and its pagination

openedx/core/djangoapps/content_libraries/views.py

@@ -90,11 +90,11 @@
 from organizations.models import Organization
 from rest_framework import status
 from rest_framework.exceptions import NotFound, PermissionDenied, ValidationError
-from rest_framework.pagination import PageNumberPagination
+from rest_framework.generics import GenericAPIView
 from rest_framework.parsers import MultiPartParser
 from rest_framework.response import Response
 from rest_framework.views import APIView
-from rest_framework.viewsets import ViewSet
+from rest_framework.viewsets import GenericViewSet
 
 from openedx.core.djangoapps.content_libraries import api, permissions
 from openedx.core.djangoapps.content_libraries.serializers import (
@@ -153,13 +153,10 @@ def wrapped_fn(*args, **kwargs):
     return wrapped_fn
 
 
-class LibraryApiPagination(PageNumberPagination):
+class LibraryApiPaginationDocs:
     """
-    Paginates over ContentLibraryMetadata objects.
+    API docs for query params related to paginating ContentLibraryMetadata objects.
     """
-    page_size = 50
-    page_size_query_param = 'page_size'
-
     apidoc_params = [
         apidocs.query_parameter(
             'pagination',
@@ -181,14 +178,14 @@ class LibraryApiPagination(PageNumberPagination):
 
 @method_decorator(non_atomic_requests, name="dispatch")
 @view_auth_classes()
-class LibraryRootView(APIView):
+class LibraryRootView(GenericAPIView):
     """
     Views to list, search for, and create content libraries.
     """
 
     @apidocs.schema(
         parameters=[
-            *LibraryApiPagination.apidoc_params,
+            *LibraryApiPaginationDocs.apidoc_params,
             apidocs.query_parameter(
                 'org',
                 str,
@@ -211,21 +208,20 @@ def get(self, request):
         library_type = serializer.validated_data['type']
         text_search = serializer.validated_data['text_search']
 
-        paginator = LibraryApiPagination()
         queryset = api.get_libraries_for_user(
             request.user,
             org=org,
             library_type=library_type,
             text_search=text_search,
         )
-        paginated_qs = paginator.paginate_queryset(queryset, request)
+        paginated_qs = self.paginate_queryset(queryset)
         result = api.get_metadata(paginated_qs)
 
         serializer = ContentLibraryMetadataSerializer(result, many=True)
         # Verify `pagination` param to maintain compatibility with older
         # non pagination-aware clients
         if request.GET.get('pagination', 'false').lower() == 'true':
-            return paginator.get_paginated_response(serializer.data)
+            return self.get_paginated_response(serializer.data)
         return Response(serializer.data)
 
     def post(self, request):
@@ -506,13 +502,14 @@ def delete(self, request, lib_key_str):  # pylint: disable=unused-argument
 
 @method_decorator(non_atomic_requests, name="dispatch")
 @view_auth_classes()
-class LibraryBlocksView(APIView):
+class LibraryBlocksView(GenericAPIView):
     """
     Views to work with XBlocks in a specific content library.
     """
+
     @apidocs.schema(
         parameters=[
-            *LibraryApiPagination.apidoc_params,
+            *LibraryApiPaginationDocs.apidoc_params,
             apidocs.query_parameter(
                 'text_search',
                 str,
@@ -538,13 +535,12 @@ def get(self, request, lib_key_str):
         api.require_permission_for_library_key(key, request.user, permissions.CAN_VIEW_THIS_CONTENT_LIBRARY)
         components = api.get_library_components(key, text_search=text_search, block_types=block_types)
 
-        paginator = LibraryApiPagination()
         paginated_xblock_metadata = [
             api.LibraryXBlockMetadata.from_component(key, component)
-            for component in paginator.paginate_queryset(components, request)
+            for component in self.paginate_queryset(components)
         ]
         serializer = LibraryXBlockMetadataSerializer(paginated_xblock_metadata, many=True)
-        return paginator.get_paginated_response(serializer.data)
+        return self.get_paginated_response(serializer.data)
 
     @convert_exceptions
     def post(self, request, lib_key_str):
@@ -742,7 +738,7 @@ def delete(self, request, usage_key_str, file_path):
 
 @method_decorator(non_atomic_requests, name="dispatch")
 @view_auth_classes()
-class LibraryImportTaskViewSet(ViewSet):
+class LibraryImportTaskViewSet(GenericViewSet):
     """
     Import blocks from Courseware through modulestore.
     """
@@ -760,9 +756,9 @@ def list(self, request, lib_key_str):
         )
         queryset = api.ContentLibrary.objects.get_by_key(library_key).import_tasks
         result = ContentLibraryBlockImportTaskSerializer(queryset, many=True).data
-        paginator = LibraryApiPagination()
-        return paginator.get_paginated_response(
-            paginator.paginate_queryset(result, request)
+
+        return self.get_paginated_response(
+            self.paginate_queryset(result)
         )
 
     @convert_exceptions