简单的表连接

 

class Article < ActiveRecord::Base
  belongs_to :user
end

class User < ActiveRecord::Base
  has_many :articles
end

# Get all the users that have published articles
User.find(:all, :joins => :article,
  :conditions => ["articles.published = ?", true])

 

 

# Get all the users that have published articles
User.find(:all, :joins => :article,
  :conditions => { :articles => { :published => true } })