Мне нужна помощь.
Я пытаюсь составить таблицу сообщений с самообращающейся ассоциацией. Один пост может иметь несколько ответов (также пост). Я включаю только основные части. Мой пост класс:
# == 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, у меня также есть класс User, 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 самоассоциации. Например, в следующем сеансе консоли rails я создаю 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>
---
Затем я пытаюсь использовать самоассоциации Post, но одна из них не работает: Post # replied_post, кажется, работает, но ответы Post # не работают:
---
<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>
---
Есть подсказка? Что не так с моими определениями ассоциации? Я прочитал документацию, и кажется, что она четко определена.
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