See #432: added admin API endpoints to retrieve and delete tags

api/funkwhale_api/manage/views.py

@@ -2,7 +2,7 @@ from rest_framework import mixins, response, viewsets
 from rest_framework import decorators as rest_decorators
 
 from django.db.models import Count, Prefetch, Q, Sum, OuterRef, Subquery
-from django.db.models.functions import Coalesce
+from django.db.models.functions import Coalesce, Length
 from django.shortcuts import get_object_or_404
 
 from funkwhale_api.common import models as common_models
@@ -14,6 +14,7 @@ from funkwhale_api.history import models as history_models
 from funkwhale_api.music import models as music_models
 from funkwhale_api.moderation import models as moderation_models
 from funkwhale_api.playlists import models as playlists_models
+from funkwhale_api.tags import models as tags_models
 from funkwhale_api.users import models as users_models
 
 
@@ -452,3 +453,43 @@ class ManageInstancePolicyViewSet(
 
     def perform_create(self, serializer):
         serializer.save(actor=self.request.user.actor)
+
+
+class ManageTagViewSet(
+    mixins.ListModelMixin,
+    mixins.RetrieveModelMixin,
+    mixins.DestroyModelMixin,
+    mixins.CreateModelMixin,
+    viewsets.GenericViewSet,
+):
+    lookup_field = "name"
+    queryset = (
+        tags_models.Tag.objects.all()
+        .order_by("-creation_date")
+        .annotate(items_count=Count("tagged_items"))
+        .annotate(length=Length("name"))
+    )
+    serializer_class = serializers.ManageTagSerializer
+    filterset_class = filters.ManageTagFilterSet
+    required_scope = "instance:libraries"
+    ordering_fields = ["id", "creation_date", "name", "items_count", "length"]
+
+    def get_queryset(self):
+        queryset = super().get_queryset()
+        from django.contrib.contenttypes.models import ContentType
+
+        album_ct = ContentType.objects.get_for_model(music_models.Album)
+        track_ct = ContentType.objects.get_for_model(music_models.Track)
+        artist_ct = ContentType.objects.get_for_model(music_models.Artist)
+        queryset = queryset.annotate(
+            _albums_count=Count(
+                "tagged_items", filter=Q(tagged_items__content_type=album_ct)
+            ),
+            _tracks_count=Count(
+                "tagged_items", filter=Q(tagged_items__content_type=track_ct)
+            ),
+            _artists_count=Count(
+                "tagged_items", filter=Q(tagged_items__content_type=artist_ct)
+            ),
+        )
+        return queryset