FEATURE: Allow group owners to edit group name and avatar flair.

app/serializers/group_show_serializer.rb

@@ -1,11 +1,25 @@
 class GroupShowSerializer < BasicGroupSerializer
-  attributes :is_group_user
+  attributes :is_group_user, :is_group_owner
 
   def include_is_group_user?
     scope.authenticated?
   end
 
   def is_group_user
-    object.users.include?(scope.user)
+    !!fetch_group_user
+  end
+
+  def include_is_group_owner?
+    scope.authenticated?
+  end
+
+  def is_group_owner
+    scope.is_admin? || fetch_group_user&.owner
+  end
+
+  private
+
+  def fetch_group_user
+    @group_user ||= object.group_users.find_by(user: scope.user)
   end
 end