Rails 有很多错误

Question

似乎我已经按照 AR 错误消息的提示定义了源，但仍然出现错误。任何的想法？ Rails 3.2、Ruby 1.9.2

    class Document < ActiveRecord::Base
      has_many :participations
      has_many :users, :through => :participations

      has_many :editing_sessions
      has_many :editors, :through => :editing_sessions, :source => :users
    end


    class User < ActiveRecord::Base
      has_many :participations
      has_many :documents , :through => :participations

      has_many :editing_sessions
      has_many :open_documents, :through => :editing_sessions, :source => :documents
    end


    class EditingSession < ActiveRecord::Base
      belongs_to :users
      belongs_to :documents
    end

    create_table "editing_sessions", :force => true do |t|
      t.integer  "user_id"
      t.integer  "document_id"

      t.datetime "created_at",  :null => false
      t.datetime "updated_at",  :null => false
    end


    Console:

    u = User.first
    => ... OK

    u.editing_sessions
    => []

    u.open_documents
    => ActiveRecord::HasManyThroughSourceAssociationNotFoundError: Could not find the source association(s) :document in model EditingSession. Try 'has_many :open_documents, :through => :editing_sessions, :source => <name>'. Is it one of :users or :documents?

Answer 1

尝试更改 EditingSession 定义，使 belongs_to 标签为单数形式：

class EditingSession < ActiveRecord::Base
  belongs_to :user
  belongs_to :document
end

但将 Document 和 Users 类中的其他源定义保留为复数形式（即 :source => :users 和 :source => :documents）

这就是Ruby on Rails Has-Many-Through Guide 中的约定