Я не могу заставить камень state_machine
(http://github.com/pluginaweek/state_machine/) работать с существующими записями (он корректно работает с новыми записями).
Вот моя модель:
class Comment < ActiveRecord::Base
state_machine :state, :initial => :pending do
event :publish do
transition all => :published
end
end
end
и вот сеанс IRB, который демонстрирует проблему (я сделал ActiveRecord::Base.logger = Logger.new(STDOUT)
, чтобы было легче читать):
>> c = Comment.new
=> #<Comment id: nil, song_id: nil, author: nil, body: nil, created_at: nil, updated_at: nil, state: "pending">
>> c.state
=> "pending"
>> c.publish
Comment Create (0.6ms) INSERT INTO "comments" ("updated_at", "body", "author", "song_id", "created_at", "state") VALUES('2009-11-02 02:44:37', NULL, NULL, NULL, '2009-11-02 02:44:37', 'published')
=> true
>> Comment.last.state
Comment Load (0.4ms) SELECT * FROM "comments" ORDER BY comments.id DESC LIMIT 1
=> "published"
>> c = Comment.create
Comment Create (0.5ms) INSERT INTO "comments" ("updated_at", "body", "author", "song_id", "created_at", "state") VALUES('2009-11-02 02:44:47', NULL, NULL, NULL, '2009-11-02 02:44:47', 'pending')
=> #<Comment id: 4, song_id: nil, author: nil, body: nil, created_at: "2009-11-02 02:44:47", updated_at: "2009-11-02 02:44:47", state: "pending">
>> c.publish
=> true
>> c.save
=> true
>> Comment.last.state
Comment Load (0.4ms) SELECT * FROM "comments" ORDER BY comments.id DESC LIMIT 1
=> "pending"
То есть, все отлично работает, когда я publish
несохраненный комментарий, но когда я пытаюсь опубликовать уже сохраненный комментарий, ничего не происходит.
Другое редактирование: Возможно, корень проблемы?
=> true
>> a = Comment.last
Comment Load (1.3ms) SELECT * FROM "comments" ORDER BY comments.id DESC LIMIT 1
=> #<Comment id: 3, song_id: nil, author: nil, body: nil, created_at: "2009-11-03 03:03:54", updated_at: "2009-11-03 03:03:54", state: "pending">
>> a.state
=> "pending"
>> a.publish
=> true
>> a.state
=> "published"
>> a.state_changed?
=> false
То есть, даже если состояние действительно изменилось, state_changed?
возвращает false, и поэтому Rails не будет обновлять соответствующую строку базы данных, когда я вызываю save
.
Работает, когда я отключаю частичные обновления, но не при попытке state_will_change!
:
>> Comment.partial_updates = false
=> false
>> c = Comment.create
Comment Create (0.5ms) INSERT INTO "comments" ("updated_at", "body", "author", "song_id", "created_at", "state") VALUES('2009-11-07 05:06:49', NULL, NULL, NULL, '2009-11-07 05:06:49', 'pending')
=> #<Comment id: 7, song_id: nil, author: nil, body: nil, created_at: "2009-11-07 05:06:49", updated_at: "2009-11-07 05:06:49", state: "pending">
>> c.publish
Comment Update (0.9ms) UPDATE "comments" SET "created_at" = '2009-11-07 05:06:49', "author" = NULL, "state" = 'published', "body" = NULL, "song_id" = NULL, "updated_at" = '2009-11-07 05:06:53' WHERE "id" = 7
=> true
>> Comment.last.state
Comment Load (0.5ms) SELECT * FROM "comments" ORDER BY comments.id DESC LIMIT 1
=> "published"
>> Comment.partial_updates = true
=> true
>> c = Comment.create
Comment Create (0.8ms) INSERT INTO "comments" ("updated_at", "body", "author", "song_id", "created_at", "state") VALUES('2009-11-07 05:07:21', NULL, NULL, NULL, '2009-11-07 05:07:21', 'pending')
=> #<Comment id: 8, song_id: nil, author: nil, body: nil, created_at: "2009-11-07 05:07:21", updated_at: "2009-11-07 05:07:21", state: "pending">
>> c.state_will_change!
=> "pending"
>> c.publish
=> true
>> c.save
=> true
>> Comment.last.state
Comment Load (0.5ms) SELECT * FROM "comments" ORDER BY comments.id DESC LIMIT 1
=> "pending"
EDIT:
Больше странностей:
>> a = Comment.last
Comment Load (1.2ms) SELECT * FROM "comments" ORDER BY comments.id DESC LIMIT 1
=> #<Comment id: 5, song_id: nil, author: nil, body: nil, created_at: "2009-11-02 06:33:19", updated_at: "2009-11-02 06:33:19", state: "pending">
>> a.state
=> "pending"
>> a.publish
=> true
>> a.state
=> "published"
>> a.save
=> true
>> a.id
=> 5
>> Comment.find(5).state
Comment Load (0.3ms) SELECT * FROM "comments" WHERE ("comments"."id" = 5)
=> "pending"
Сравнить с:
>> a = Comment.last
Comment Load (0.3ms) SELECT * FROM "comments" ORDER BY comments.id DESC LIMIT 1
=> #<Comment id: 5, song_id: nil, author: nil, body: nil, created_at: "2009-11-02 06:33:19", updated_at: "2009-11-02 06:33:19", state: "pending">
>> a.state = "published"
=> "published"
>> a.save
Comment Update (0.6ms) UPDATE "comments" SET "state" = 'published', "updated_at" = '2009-11-02 08:29:34' WHERE "id" = 5
=> true
>> a.id
=> 5
>> Comment.find(5).state
Comment Load (0.4ms) SELECT * FROM "comments" WHERE ("comments"."id" = 5)
=> "published"