On Wednesday, February 16, 2011 1:31:11 PM UTC-7, Matt jones wrote:
>
> def create_permitted?
>   return false unless user.signed_up?
>   return false if post.comments.exists?(:user_id => acting_user.id)
>   user_is? acting_user
> end
>
> This will completely avoid even loading the other comments (it does a 
> single select with the conditions supplied + the association conditions).
>
> --Matt Jones
>

I figured that given the use, it'll probably be on a post show page that 
already includes the full comments+user association in it's load (or it 
should unless you're paginating comments).  But, yeah, otherwise a single 
sql call would be preferable.

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