Rails 3：在 has_many 关联上调用数据库

Question

您好，我有一个多对多关联，其中“帖子”有很多“感觉”，我想弄清楚如何找到用户具有特定感觉的所有帖子。我的 Feeling 模型有一个“名称”属性。

class User < ActiveRecord::Base
  has_many :posts, :dependent => :destroy
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable
end

class Post < ActiveRecord::Base
  has_many :feelingships
  has_many :feelings, :through => :feelingships
  belongs_to :user
end

class Feeling < ActiveRecord::Base
  has_many :feelingships
  has_many :posts, :through => :feelingships
end


class Feelingship < ActiveRecord::Base
  belongs_to :post
  belongs_to :feeling
  attr_accessible :post_id, :feeling_id
end

我尝试了这个，但它说我有错误的关联：“ActiveRecord::ConfigurationError: 未找到名为“感觉”的关联；也许您拼写错误？”

 def feeling
  @user = User.find(params[:id])
  @feed_items= @user.posts.includes(:feeling).where(
          ['`feelings`.name = ?', params[:feeling]])
  @feed_items = @feed_items.paginate(:per_page => "10", :page => params[:page])
render 'shared/_feed', :layout => 'head_layout'
end

Answer 1

includes 参数应该是 :feelings - 注意复数，这就是您的关联的名称。

所以应该是：

@user.posts.includes(:feelings)