Forum: Ruby on Rails How do you check if associated table is empty from find?

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Bob S. (Guest)
on 2009-02-17 03:36
So I have two tables:

- teams
- players

I'm trying to find all teams that have no players. I thought this could
work:

Team.find(:all, :joins => :players, :conditions => ["players.size = ?",
0] )

Of course that's not working for me because I'm mixing the SQL with
Rails. Do you know the proper way to find all teams that have no
players?
Jeff E. (Guest)
on 2009-02-17 03:47
(Received via mailing list)
You could add a :counter_cache to your model if you want a simple
solution:

http://api.rubyonrails.org/classes/ActiveRecord/As...


On Feb 16, 8:36 pm, Bob S. <removed_email_address@domain.invalid>
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