1 files changed, 47 insertions, 0 deletions
diff --git a/lib/gitlab/graphql/pagination/keyset/generic_keyset_pagination.rb b/lib/gitlab/graphql/pagination/keyset/generic_keyset_pagination.rb
new file mode 100644
index 00000000000..318c6e1734f
--- /dev/null
+++ b/lib/gitlab/graphql/pagination/keyset/generic_keyset_pagination.rb
@@ -0,0 +1,47 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Graphql
+    module Pagination
+      module Keyset
+        # Use the generic keyset implementation if the given ActiveRecord scope supports it.
+        # Note: this module is temporary, at some point it will be merged with Keyset::Connection
+        module GenericKeysetPagination
+          extend ActiveSupport::Concern
+
+          def ordered_items
+            return super unless Gitlab::Pagination::Keyset::Order.keyset_aware?(items)
+
+            items
+          end
+
+          def cursor_for(node)
+            return super unless Gitlab::Pagination::Keyset::Order.keyset_aware?(items)
+
+            order = Gitlab::Pagination::Keyset::Order.extract_keyset_order_object(items)
+            encode(order.cursor_attributes_for_node(node).to_json)
+          end
+
+          def slice_nodes(sliced, encoded_cursor, before_or_after)
+            return super unless Gitlab::Pagination::Keyset::Order.keyset_aware?(sliced)
+
+            order = Gitlab::Pagination::Keyset::Order.extract_keyset_order_object(sliced)
+            order = order.reversed_order if before_or_after == :before
+
+            decoded_cursor = ordering_from_encoded_json(encoded_cursor)
+            order.apply_cursor_conditions(sliced, decoded_cursor)
+          end
+
+          def sliced_nodes
+            return super unless Gitlab::Pagination::Keyset::Order.keyset_aware?(items)
+
+            sliced = ordered_items
+            sliced = slice_nodes(sliced, before, :before) if before.present?
+            sliced = slice_nodes(sliced, after, :after) if after.present?
+            sliced
+          end
+        end
+      end
+    end
+  end
+end