Rails 3 отдельная ассоциация самооценки не работает

Question

Мне нужна помощь.

Я пытаюсь составить таблицу сообщений с ассоциацией самореференции. Один пост может иметь некоторые ответы (также сообщение). Я включаю только основные части. Мой класс сообщения:

# == Schema Information 
# 
# Table name: microposts 
# 
# id   :integer   not null, primary key 
# content  :string(255) 
# user_id  :integer 
# created_at :datetime 
# updated_at :datetime 
# in_reply_to :integer 
# 

class Micropost < ActiveRecord::Base 

    attr_accessible :content, :in_reply_to 
    ... 
    belongs_to :user 
    # SOMETHING SHOULD BE WRONG HERE ?!? 
    has_many :replies, :class_name => 'Micropost', 
        :inverse_of => :replied_post 
    belongs_to :replied_post, :class_name => 'Micropost', 
          :foreign_key => "in_reply_to", 
          :inverse_of => :replies 

    ... 
end 

Очевидно, что у меня есть класс пользователя, которому принадлежат сообщения.

class User < ActiveRecord::Base 
    ... 
    has_many :microposts, :dependent => :destroy 
    ... 
end 

Хотя я могу создавать сообщения и их ответы, как обычно, я не могу использовать самосоединения. Например, в следующей сессии Рельсы консоли создать сообщение и ответ на него от другого пользователя:

--- 
<b> 
1.9.2-p290 :014 > usr1=User.find(1) 

    User Load (0.6ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1 [["id", 1]] 
=> #<User id: 1, name: "Marcel Massana", email: "xaxaupua@gmail.com", created_at: "2012-03-13 00:07:12", updated_at: "2012-03-13 00:07:13", encrypted_password: "339f5f93bbbd7d9b4fdc58a89aa74797c23ccd5acb154e3987a...", salt: "849c6fbeb17e1a4a7e3ef3153d8c41f4ff3ca5435915f87f985...", admin: true> 

1.9.2-p290 :020 > usr2=User.find(2) 

    User Load (0.2ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1 [["id", 2]] 
=> #<User id: 2, name: "Pep Massana", email: "fitxia@gmail.com", created_at: "2012-03-13 00:07:13", updated_at: "2012-03-13 00:07:13", encrypted_password: "00707453381192a4cc7a5714df15da0fa4c2ffa944460bc33d2...", salt: "5af002dc3fad187dac26acee522d44d19d6a2daafcec7fb412e...", admin: true> 

1.9.2-p290 :021 > usr1.microposts.create(:content=>"Hi Pep") 

    SQL (0.7ms) INSERT INTO "microposts" ("content", "created_at", "in_reply_to", "updated_at", "user_id") VALUES (?, ?, ?, ?, ?) [["content", "Hi Pep"], ["created_at", Wed, 14 Mar 2012 18:08:45 UTC +00:00], ["in_reply_to", nil], ["updated_at", Wed, 14 Mar 2012 18:08:45 UTC +00:00], ["user_id", 1]] 
=> #<Micropost id: 104, content: "Hi Pep", user_id: 1, created_at: "2012-03-14 18:08:45", updated_at: "2012-03-14 18:08:45", in_reply_to: nil> 

1.9.2-p290 :022 > mp1=Micropost.find(104) 

    Micropost Load (0.2ms) SELECT "microposts".* FROM "microposts" WHERE "microposts"."id" = ? ORDER BY microposts.created_at DESC LIMIT 1 [["id", 104]] 
=> #<Micropost id: 104, content: "Hi Pep", user_id: 1, created_at: "2012-03-14 18:08:45", updated_at: "2012-03-14 18:08:45", in_reply_to: nil> 

1.9.2-p290 :023 > mp2 = usr2.microposts.create(content: "good to see you Marcel", in_reply_to: 104) 

    SQL (0.8ms) INSERT INTO "microposts" ("content", "created_at", "in_reply_to", "updated_at", "user_id") VALUES (?, ?, ?, ?, ?) [["content", "good to see you Marcel"], ["created_at", Wed, 14 Mar 2012 18:11:24 UTC +00:00], ["in_reply_to", 104], ["updated_at", Wed, 14 Mar 2012 18:11:24 UTC +00:00], ["user_id", 2]] 
=> #<Micropost id: 105, content: "good to see you Marcel", user_id: 2, created_at: "2012-03-14 18:11:24", updated_at: "2012-03-14 18:11:24", in_reply_to: 104> 
</b> 

--- 

Тогда я пытаюсь использовать почтовые само-ассоциации, но один из них не работают: Сообщение # Answer_post, похоже, работает, но сообщений # ответов нет:

--- 
<b> 
1.9.2-p290 :024 > mp2.replied_post 

    Micropost Load (0.3ms) SELECT "microposts".* FROM "microposts" WHERE "microposts"."id" = 104 ORDER BY microposts.created_at DESC LIMIT 1 

<Micropost id: 104, content: "Hi Pep", user_id: 1, created_at: "2012-03-14 18:08:45", updated_at: "2012-03-14 18:08:45", in_reply_to: nil> 

1.9.2-p290 :025 > mp1.replies 

    Micropost Load (0.2ms) SELECT "microposts".* FROM "microposts" WHERE "microposts"."micropost_id" = 104 ORDER BY microposts.created_at DESC 
SQLite3::SQLException: no such column: microposts.micropost_id: SELECT "microposts".* FROM "microposts" WHERE "microposts"."micropost_id" = 104 ORDER BY microposts.created_at DESC 
ActiveRecord::StatementInvalid: SQLite3::SQLException: no such column: microposts.micropost_id: SELECT "microposts".* FROM "microposts" WHERE "microposts"."micropost_id" = 104 ORDER BY microposts.created_at DESC 
    from /home/marcel/.rvm/gems/ruby-1.9.2-p290/gems/sqlite3-1.3.5/lib/sqlite3/database.rb:91:in `initialize' 
    from /home/marcel/.rvm/gems/ruby-1.9.2-p290/gems/sqlite3-1.3.5/lib/sqlite3/database.rb:91:in `new' 
    from /home/marcel/.rvm/gems/ruby-1.9.2-p290/gems/sqlite3-1.3.5/lib/sqlite3/database.rb:91:in `prepare' 
... 
</b> 

--- 

Любой намек? Что случилось с определениями моей ассоциации? Я прочитал документацию и, кажется, четко определен.

ТИА

PS: Моя конфигурация

About your application's environment 
Ruby version    1.9.2 (i686-linux) 
RubyGems version   1.8.10 
Rack version    1.3 
Rails version    3.1.3 
JavaScript Runtime  therubyracer (V8) 
Active Record version  3.1.3 
Action Pack version  3.1.3 
Active Resource version 3.1.3 
Action Mailer version  3.1.3 
Active Support version 3.1.3 
Middleware    ActionDispatch::Static, Rack::Lock, #<ActiveSupport::Cache::Strategy::LocalCache::Middleware:0x9c4d494>, Rack::Runtime, Rack::MethodOverride, Rails::Rack::Logger, ActionDispatch::ShowExceptions, ActionDispatch::RemoteIp, Rack::Sendfile, ActionDispatch::Reloader, ActionDispatch::Callbacks, ActiveRecord::ConnectionAdapters::ConnectionManagement, ActiveRecord::QueryCache, ActionDispatch::Cookies, ActionDispatch::Session::CookieStore, ActionDispatch::Flash, ActionDispatch::ParamsParser, ActionDispatch::Head, Rack::ConditionalGet, Rack::ETag, ActionDispatch::BestStandardsSupport 
Application root   /home/marcel/Dropbox/DESENVOLUPAMENT/Rails3Examples/ror_tutorial 
Environment    development 
Database adapter   sqlite3 
Database schema version 20120313233558 

Answer 1

Я перепроверил все думают, и обнаружил, что я должен был добавить :foreign_key => "in_reply_to" также в has_many заявлении.

has_many :replies, :class_name => 'Micropost', 
        :foreign_key => "in_reply_to", 
        :inverse_of => :replied_post 
belongs_to :replied_post, :class_name => 'Micropost', 
          :foreign_key => "in_reply_to", 
          :inverse_of => :replies