ActiveRecord - querying polymorphic associations

Question

I am using polymorphic associations to track Comments in my project. All very straight forward stuff.

The problem I have is in querying based on the polymorphic asso

Answer 1

Argh!

I think I found the problem.

When joining via:

@comments = Comment.find(:all,
        :joins => "forum_topics",
        :conditions => ["forum_topics.featured = ? ", true] 
        )

You need the whole join!

:joins => "INNER JOIN forum_topics ON forum_topics.id = comments.commentable_id",

See the ever-awesome: http://guides.rubyonrails.org/active_record_querying.html#joining-tables