如何在has_many上使用：source參數：通過與命名空間模型的關聯？

Question

這是模型。

Recipes::Recipe ：

module Recipes
  class Recipe < ActiveRecord::Base
    include ApplicationHelper

    attr_accessible :body, :title, :author, :photos, :tags

    has_many :photos
    has_many :favorites
    has_many :taggings
    has_many :tags, :through => :taggings

    belongs_to :author,
               :class_name => :User,
               :foreign_key => :author_id

    has_many :favorers,
             :source => :user,
             :through => :favorites

    before_create :default_values
    before_validation :create_slug

    validates_presence_of :title, :body, :author
    validates_uniqueness_of :title, :slug
  end
end

User ：

class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :token_authenticatable, :confirmable,
  # :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable

  attr_accessible :login, :email, :password, :password_confirmation, :remember_me

  has_many :recipes,
           :class_name => 'Recipes::Recipe',
           :foreign_key => :author_id

  has_many :favorite_recipes,
           :class_name => 'Recipes::Recipe',
           :foreign_key => :recipe_id,
           :source => :recipe,
           :through => :favorites

  end
end

Recipes::Favorite ：

module Recipes
  class Favorite < ActiveRecord::Base
    attr_accessible :user_id, :recipe_id

    belongs_to :recipe,
               :class_name => "Recipes::Recipe"
    belongs_to :user,
               :class_name => "User"
  end
end

在Recipes::Recipe模型上引用屬性時，該關聯有效。 如果我做recipe = Recipes::Recipe.first; recipe.favorers recipe = Recipes::Recipe.first; recipe.favorers它的工作原理。 當我做user = User.first; user.favorite_recipes user = User.first; user.favorite_recipes我收到一個錯誤。

錯誤：

1.9.3-p392 :002 > u.favorite_recipes
ActiveRecord::HasManyThroughAssociationNotFoundError: Could not find the association     
:favorites in model User

我假設它正在嘗試找到模型Favorite ，但實際上應該是Recipes::Favorite 。 我在Rails文檔中讀到:foreign_key和:class_name在has_many :through上被忽略has_many :through關聯，但我還是嘗試了它們，但它仍然無效。 所以現在我想知道，我怎么能告訴一個has_many :through :source參數它應該找一個命名空間模型？ 我也嘗試過:recipes_recipe :source參數，表名為:favorites只是'收藏夾'。

Answer 1

我解決了這個問題。

解決方案是錯誤的。

ActiveRecord::HasManyThroughAssociationNotFoundError: Could not find the association
:favorites in model User

has_many :through association正在尋找User模型上的has_many :favorites 。

所以，我剛剛添加了has_many :favorites, :class_name => 'Recipes::Favorite' ，上面的代碼開始為兩個協會工作。