I don't know if you can get there just w/HM=>T, but you can fake out the last
link w/a custom method. This is working for me:
class Article < ActiveRecord::Base
belongs_to :feed_entry
end
class FeedEntry < ActiveRecord::Base
belongs_to :feed
has_many :articles
end
class Feed < ActiveRecord::Base
belongs_to :site
has_many :feed_entries
has_many :articles, :through => :feed_entries
end
class Site < ActiveRecord::Base
has_many :feeds
def articles
arts = []
self.feeds.each do |f|
arts << f.articles
end
# Not sure if that uniq call is necessary...
arts.flatten.uniq
end
end
That gives me a my_site.articles collection which returns the union of all
articles attached to any feed_entry attached to any feed attached to the Site.
HTH,
-Roy
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of sol
Sent: Wednesday, February 25, 2009 2:11 AM
To: Ruby on Rails: Talk
Subject: [Rails] Association through 2 intermediate Models
Hey,
I have an association chain like this:
Site has_many Feed(s) has_many FeedEntry(/ies) has_many Articles
where the reverse is always belongs_to:
Article belongs_to FeedEntry belongs_to Feed belongs_to Site
Now what I want is to get all articles that belong to a specific Site,
something like Site.first.articles
I can't figure out how to do this, or if it's possible with has_many :through
Can anyone give me a hint please?
Thank you
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