[DONE] In the Rest API, add a video and role filter for contributors (#…

…1039)

* In the REst API, add a video and role filter for contributors

* In the Rest API, add a video filter for documents, tracks and overlays

pod/completion/rest_views.py

@@ -54,18 +54,22 @@ class Meta:
 class ContributorViewSet(viewsets.ModelViewSet):
     queryset = Contributor.objects.all()
     serializer_class = ContributorSerializer
+    filterset_fields = ['video', 'role',]
 
 
 class DocumentViewSet(viewsets.ModelViewSet):
     queryset = Document.objects.all()
     serializer_class = DocumentSerializer
+    filterset_fields = ['video',]
 
 
 class TrackViewSet(viewsets.ModelViewSet):
     queryset = Track.objects.all()
     serializer_class = TrackSerializer
+    filterset_fields = ['video',]
 
 
 class OverlayViewSet(viewsets.ModelViewSet):
     queryset = Overlay.objects.all()
     serializer_class = OverlaySerializer
+    filterset_fields = ['video',]