Rails - Jul 2014 - question_parts: a N+1 problem when updating a model with a relationship

Hello all.

I have a N+1 problem which I cannot solve. I have a sample app hosted here 
that shows the issue: https://github.com/davidmles/question_parts

This is how it works:

There are 4 models: question, question_part, answer, and answer_part.
A question has N parts, and also N answers. An answer has N parts. And an 
answer part belongs to an answer and to a question part (the one is 
answering).

An answer can be a draft or published. A draft does not need to have all 
its parts answered, while a published answer does need them answered.

The problem:

When an answer is created, but not all its parts are answered, and I try to 
publish it, validation will fail and the edit form will be shown again. 
When showing that edit form after validation failed, there will be a N+1 
problem, as answer parts will load the corresponding question parts without 
eager loading them.

I have tried to eager load them, but then the edit form will not show the 
proper error.

How could I solve this? I have explained a bit better the problem in the 
app's readme: 
https://github.com/davidmles/question_parts/blob/master/README.md

Thanks.

-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To view this discussion on the web visit
https://groups.google.com/d/msgid/rubyonrails-talk/b3d935f9-1e92-4499-9551-c88274184441%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.