core: only return group names for user_self

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

authentik/core/api/users.py

@@ -101,9 +101,14 @@ class UserSelfSerializer(ModelSerializer):
 
     is_superuser = BooleanField(read_only=True)
     avatar = CharField(read_only=True)
-    groups = ListSerializer(child=GroupSerializer(), read_only=True, source="ak_groups")
+    groups = SerializerMethodField()
     uid = CharField(read_only=True)
 
+    def get_groups(self, user: User) -> list[str]:
+        """Return only the group names a user is member of"""
+        for group in user.ak_groups.all():
+            yield group.name
+
     class Meta:
 
         model = User

schema.yml

@@ -29273,7 +29273,7 @@ components:
         groups:
           type: array
           items:
-            $ref: '#/components/schemas/Group'
+            type: string
           readOnly: true
         email:
           type: string