Add count to TagSerializer (#1621)

Add count to TagSerializer

fixes: #1612

CHANGES/1612.feature

@@ -0,0 +1 @@
+Display the ``count`` attribute in the tags of collections.

pulp_ansible/app/serializers.py

@@ -385,9 +385,11 @@ class TagSerializer(serializers.ModelSerializer):
     A serializer for the Tag model.
     """
 
+    count = serializers.IntegerField(read_only=True)
+
     class Meta:
         model = Tag
-        fields = ["name"]
+        fields = ["name", "count"]
 
 
 class TagNestedSerializer(ModelSerializer):

pulp_ansible/app/viewsets.py

@@ -3,6 +3,7 @@
 from django.contrib.postgres.search import SearchQuery
 from django.db.models import fields as db_fields
 from django.db.models.expressions import F, Func
+from django.db.models import Count
 from django_filters import filters
 from django.http import HttpResponseRedirect, HttpResponseNotFound
 from drf_spectacular.utils import extend_schema
@@ -1196,6 +1197,10 @@ class TagViewSet(NamedModelViewSet, mixins.ListModelMixin):
     queryset = Tag.objects.all()
     serializer_class = TagSerializer
 
+    def get_queryset(self):
+        qs = super().get_queryset()
+        return qs.annotate(count=Count("ansible_collectionversion"))
+
 
 class CopyViewSet(viewsets.ViewSet):
     """