Remove an unused serializer field

backend/api/serializers.py

@@ -201,17 +201,6 @@ class ProjectPolymorphicSerializer(PolymorphicSerializer):
     }
 
 
-class ProjectFilteredPrimaryKeyRelatedField(serializers.PrimaryKeyRelatedField):
-
-    def get_queryset(self):
-        view = self.context.get('view', None)
-        request = self.context.get('request', None)
-        queryset = super(ProjectFilteredPrimaryKeyRelatedField, self).get_queryset()
-        if not request or not queryset or not view:
-            return None
-        return queryset.filter(project=view.kwargs['project_id'])
-
-
 class CategorySerializer(serializers.ModelSerializer):
     label = serializers.PrimaryKeyRelatedField(queryset=Label.objects.all())
     example = serializers.PrimaryKeyRelatedField(queryset=Example.objects.all())