0
@project.posts.count
=> 11
@project.articles.count
=> 5
>> a = @project.articles.map(&:signup_id)
=> [6, 8, 10, 12, 14]
我想只顯示不具有下列[6,8,10,12,14]的ID項目的職位。所以我想顯示不具有article.signup_id
@project.posts #so reject if id is [6, 8, 10, 12, 14]
它們之間的關係,我想做到這一點
@project.posts.find(:all, :include => [:articles], :conditions => 'articles.signup_id is null'
但我認爲
也許刪除此問題?由於http://stackoverflow.com/questions/3867074 – Nakilon 2010-10-05 19:44:53