Ruby on rails 即时加载条件关联

我有以下课程：

class Car < ActiveRecord::Base

  has_many  :adverts, :dependent => :destroy
  has_many  :active_adverts, :class_name => 'Advert', :select => "adverts.id, adverts.availability_state, adverts.source_name, adverts.last_observed_at", :conditions => "availability_state = 'active'"

end

我做错了什么

我听从了她的建议：

其中规定：

如果您确实希望仅加载关联的某些成员，则它是 通常更自然地包含有条件的关联 定义如下：

class Post < ActiveRecord::Base
  has_many :approved_comments, :class_name => 'Comment', :conditions => ['approved = ?', true]
end

class PostComment'，：conditions=>['approved=？'，true]
结束

Post.includes（：approved_comments）这将加载帖子和即时加载 已批准的_注释关联，仅包含这些注释 已经批准的

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找到它时，忘记在选择中选择外键

car\u id

class Post < ActiveRecord::Base
  has_many :approved_comments, :class_name => 'Comment', :conditions => ['approved = ?', true]
end