gracefully display filters

apps/api/metadata.py

@@ -1,6 +1,12 @@
-from rest_framework import serializers
+
+from logging import getLogger
+
+from rest_framework import serializers, fields
 from rest_framework.metadata import SimpleMetadata
 from rest_framework.request import clone_request
+from django.utils.encoding import force_str
+
+log = getLogger(__name__)
 
 
 class ExpandedMetadata(SimpleMetadata):
@@ -11,6 +17,9 @@ class ExpandedMetadata(SimpleMetadata):
         if hasattr(view, "ordering_fields"):
             metadata["sort"] = view.ordering_fields
 
+        if hasattr(view, "filterset_fields"):
+            metadata["filter"] = view.filterset_fields
+
         return metadata
 
     def determine_actions(self, request, view):
@@ -39,3 +48,13 @@ class ExpandedMetadata(SimpleMetadata):
                 view.request = request
 
         return actions
+
+    def get_field_info(self, field):
+        field_info = super().get_field_info(field)
+        if hasattr(field, 'default') and field.default is not fields.empty:
+            field_info['default'] = field.default
+
+        if hasattr(field, 'initial') and field.initial is not fields.empty:
+            field_info['initial'] = field.initial
+
+        return field_info