Add count to custom fields

src/documents/serialisers.py

@@ -494,6 +494,8 @@ class CustomFieldSerializer(serializers.ModelSerializer):
         read_only=False,
     )
 
+    document_count = serializers.IntegerField(read_only=True)
+
     class Meta:
         model = CustomField
         fields = [
@@ -501,6 +503,7 @@ class CustomFieldSerializer(serializers.ModelSerializer):
             "name",
             "data_type",
             "extra_data",
+            "document_count",
         ]
 
     def validate(self, attrs):

src/documents/views.py

@@ -1897,6 +1897,17 @@ class CustomFieldViewSet(ModelViewSet):
 
     queryset = CustomField.objects.all().order_by("-created")
 
+    def get_queryset(self):
+        return (
+            super()
+            .get_queryset()
+            .annotate(
+                document_count=Count(
+                    "fields",
+                ),
+            )
+        )
+
 
 class SystemStatusView(PassUserMixin):
     permission_classes = (IsAuthenticated,)