KISS ActiveRecord::Associations::Deprecation.user_facing_reflection

Another one pursuing a nice spot for HABTMs and deprecation.

Do not feel quite confortable hard-coding this logic here,
let's keep it simple.

Author: fxn

activerecord/lib/active_record/associations/deprecation.rb

@@ -79,12 +79,7 @@ def set_backtrace_supports_array_of_locations?
       end
 
       def user_facing_reflection(reflection)
-        case reflection.parent_reflection
-        when ActiveRecord::Reflection::HasAndBelongsToManyReflection
-          reflection.parent_reflection
-        else
-          reflection
-        end
+        reflection.active_record.reflect_on_association(reflection.name)
       end
   end