TMSS-736: Add Metadata class skeleton for filtering and ordering in OPTIONS

SAS/TMSS/backend/src/tmss/tmssapp/viewsets/CMakeLists.txt

@@ -4,6 +4,7 @@ include(PythonInstall)
 set(_py_files
     __init__.py
     lofar_viewset.py
+    metadata.py
     specification.py
     scheduling.py
     permissions.py

SAS/TMSS/backend/src/tmss/tmssapp/viewsets/lofar_viewset.py

@@ -17,6 +17,7 @@ from django.http import JsonResponse
 from django.urls import reverse as revese_url
 from rest_framework.decorators import action
 from lofar.common import json_utils
+from lofar.sas.tmss.tmss.tmssapp.viewsets.metadata import LOFARDefaultMetadata
 from lofar.sas.tmss.tmss.tmssapp.viewsets.permissions import TMSSPermissions, IsProjectMemberFilterBackend
 from lofar.sas.tmss.tmss.tmssapp.models import permissions
 from django_filters.rest_framework import DjangoFilterBackend, FilterSet, CharFilter
@@ -25,6 +26,7 @@ from rest_framework.filters import OrderingFilter
 from django.contrib.postgres.fields import JSONField, ArrayField
 from copy import deepcopy
 
+
 class LOFARDefaultFilterSet(FilterSet):
     FILTER_DEFAULTS = deepcopy(filterset.FILTER_FOR_DBFIELD_DEFAULTS)
     FILTER_DEFAULTS.update({
@@ -48,6 +50,7 @@ class LOFARViewSet(viewsets.ModelViewSet):
     the `format=None` keyword argument for each action.
     """
     permission_classes = (TMSSPermissions,)
+    metadata_class = LOFARDefaultMetadata
     filter_backends = (LOFARFilterBackend, OrderingFilter, IsProjectMemberFilterBackend,)
     filter_fields = '__all__'
 

SAS/TMSS/backend/src/tmss/tmssapp/viewsets/metadata.py

+from rest_framework.metadata import SimpleMetadata
+
+import logging
+logger = logging.getLogger(__name__)
+
+
+class LOFARDefaultMetadata(SimpleMetadata):
+    """
+    Metadata class to include filtering and ordering info for `OPTIONS` requests.
+    """
+    def determine_metadata(self, request, view):
+        metadata = super(LOFARDefaultMetadata, self).determine_metadata(request, view)
+        # TODO: Add filtering and ordering information.
+
+        return metadata