How do I convert this active record query to a rails 3 query

rubyonrails-talk
1

Christian Fazzini wrote:

The following SQL:

select * from medias m left join artists a on a.id = m.artist_id left join users u on u.id = a.user_id left join genres g on g.id = u.genre_id where g.name = 'Acoustic'

is the equivalent to (which works):

Video.find(:all, :conditions => ['genres.name = ?', 'Acoustic'], :include => {:artist => {:user => :genre}})

However, I know that the rails 3 active record query uses the .where() clause. How can I convert the above to something like:

Song.where({:genre => 'Acoustic', :include => {:artist => {:user => :genre}}}) <==== Does NOT work

Song.where({ :genre => 'Acoustic' }).includes({ :artist => { :user => :genre }})

2

I think that's going to try to "WHERE medias.genre = 'Acoustic'"

Perhaps:    .where(['genres.name = ?', 'Acoustic'])

(guessing that both Song and Video are STI subclasses of Media or else you've omitted some structure that might affect the answer(s) that you'll receive)

-Rob

Rob Biedenharn Rob@AgileConsultingLLC.com http://AgileConsultingLLC.com/ rab@GaslightSoftware.com http://GaslightSoftware.com/

3

Yea, thanks for the feedback. I ended up with Video.where(['genres.name = ?', 'Acoustic']).includes({:artist => {:user => :genre}}) which seems to work