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

I came across this post and it lead me to my solution. Using the commentable_type as one of my conditions but using a LEFT OUTER JOIN instead. That way forum topics without comments will be included.

LEFT OUTER JOIN `comments` ON `comments`.`commentable_id` = `forum_topics`.`id` AND `comments`.`commentable_type` = 'ForumTopic'