Forum: Ruby on Rails Polymorphic comments table needs associated model

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Jackson (Guest)
on 2009-04-29 09:00
(Received via mailing list)

I've been banging my head on this problem for a bit.

I'm using the acts_as_commentable plugin which works great.

The scenario, I'm on the user's dashboard and want to display comments
with commentable_type = Venue.  No problem.  But, if I want to display
the name of that Venue with the comment... big nasty.  The polymorphic
key is a composite key and rails doesn't have a way to recognize
this.  I really want to keep with Active Record so I tried
has_many_polymorphs, which makes finding the venue through the
comments table possible but it doesn't JOIN the venue table with the
comments table.  So I resorted to writing a sql statement.


has_many_polymorphs :commentables, :from =>
[:venues, :artists, :events], :through => :comments

# --> WORKS but doesn't include the venue

@user.comments.find :all, :conditions => "`comments`.commentable_type
= 'Venue'"

# --> Doesn't work, but it's my intention

@user.comments.find :all, :conditions => "`comments`.commentable_type
= 'Venue'", :include => :venues

#--> WORKS but it's ugly

Comment.find_by_sql "SELECT `comments`. * , `venues`. name   FROM
`comments` INNER JOIN `venues` ON = comments.commentable_id
WHERE (user_id =#{} AND commentable_type = 'Venue') ORDER BY
created_at DESC LIMIT 0 , 30"

Does anyone have any ideas on how I can avoid using find_by_sql for
this operation?


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