Leaderboard Pagination.

src/apps/api/views/competitions.py

@@ -18,7 +18,7 @@
 from rest_framework.response import Response
 from rest_framework.renderers import JSONRenderer
 from rest_framework_csv.renderers import CSVRenderer
-from api.pagination import LargePagination
+from api.pagination import DynamicChoicePagination, LargePagination
 from api.renderers import ZipRenderer
 from rest_framework.viewsets import ModelViewSet
 from api.serializers.competitions import CompetitionSerializerSimple, PhaseSerializer, \
@@ -774,10 +774,17 @@ def rerun_submissions(self, request, pk):
     def get_leaderboard(self, request, pk):
         phase = self.get_object()
         if phase.competition.fact_sheet:
-            fact_sheet_keys = [(phase.competition.fact_sheet[question]['key'], phase.competition.fact_sheet[question]['title'])
-                               for question in phase.competition.fact_sheet if phase.competition.fact_sheet[question]['is_on_leaderboard'] == 'true']
+            fact_sheet_keys = [
+                (
+                    phase.competition.fact_sheet[question]['key'],
+                    phase.competition.fact_sheet[question]['title']
+                )
+                for question in phase.competition.fact_sheet
+                if phase.competition.fact_sheet[question]['is_on_leaderboard'] == 'true'
+            ]
         else:
             fact_sheet_keys = None
+
         query = LeaderboardPhaseSerializer(phase).data
         response = {
             'title': query['leaderboard']['title'],
@@ -787,9 +794,11 @@ def get_leaderboard(self, request, pk):
             'fact_sheet_keys': fact_sheet_keys or None,
             'primary_index': query['leaderboard']['primary_index']
         }
+
         columns = [col for col in query['columns']]
         submissions_keys = {}
         submission_detailed_results = {}
+
         for submission in query['submissions']:
             submission_key = f"{submission['owner']}{submission['parent'] or submission['id']}"
             # gather detailed result from submissions for each task
@@ -814,6 +823,7 @@ def get_leaderboard(self, request, pk):
                     'organization': submission['organization'],
                     'created_when': submission['created_when']
                 })
+
             for score in submission['scores']:
 
                 # to check if a column is found
@@ -851,6 +861,21 @@ def get_leaderboard(self, request, pk):
         for k, v in submissions_keys.items():
             response['submissions'][v]['detailed_results'] = submission_detailed_results[k]
 
+        # --- pagination addition ---
+        total_count = len(response['submissions'])
+        paginator = DynamicChoicePagination()
+        paginated_submissions = paginator.paginate_queryset(response['submissions'], request, view=self)
+        if paginated_submissions is None:
+            paginated_submissions = response['submissions']
+
+        response['submissions'] = paginated_submissions
+        response['count'] = total_count
+        response['page_size'] = getattr(paginator, 'requested_page_size', request.query_params.get('page_size', 50))
+        response['next'] = paginator.get_next_link()
+        response['previous'] = paginator.get_previous_link()
+        response['allowed_page_sizes'] = [50, 100, 500, 'all']
+        # --- end pagination addition ---
+
         for task in query['tasks']:
             # This can be used to rendered variable columns on each task
             tempTask = {
@@ -862,6 +887,7 @@ def get_leaderboard(self, request, pk):
             for col in columns:
                 tempTask['columns'].append(col)
             response['tasks'].append(tempTask)
+
         return Response(response)
 
 

src/static/js/ours/client.js

@@ -147,6 +147,10 @@ CODALAB.api = {
     get_leaderboard_for_render: function (phase_pk) {
         return CODALAB.api.request('GET', `${URLS.API}phases/${phase_pk}/get_leaderboard/`)
     },
+    get_leaderboard_for_render: function (phase_pk, params = {}) {
+        return CODALAB.api.request('GET', `${URLS.API}phases/${phase_pk}/get_leaderboard/`, params)
+    },
+
     update_submission_score: function (pk, data) {
         return CODALAB.api.request('PATCH', `${URLS.API}submission_scores/${pk}/`, data)
     },