我知道我可以使用回调,但这应该是可行的。我做了长时间的搜索,没有结果。这是我认为会奏效的。
def User < ActiveRecord::Base
has_many :documents
has_many :draft_docs , :class_name => 'Document', :conditions => { :status => 'draft' }
has_many :published_docs , :class_name => 'Document', :conditions => { :status => 'published' }
has_many :private_docs , :class_name => 'Document', :conditions => { :status => 'private' }
end
def Document < ActiveRecord::Base
belongs_to :user , :counter_cache => true
belongs_to :user , :inverse_of => :draft_docs , :counter_cache => true
belongs_to :user , :inverse_of => :published_docs, :counter_cache => true
belongs_to :user , :inverse_of => :private_docs , :counter_cache => true
end
未按计划工作,因为您可以看到其更新的文档计数而不是发布的文档计数。
ruby-1.9.2-p180 :021 > User.reset_counters 2, :published_docs User Load (0.4ms) SELECT `users`.* FROM `users` WHERE `users`.`id` = 2 LIMIT 1
(0.7ms) SELECT COUNT(*) FROM `documents` WHERE `documents`.`user_id` = 2 AND `documents`.`status` = 'published'
(2.2ms) UPDATE `users` SET `documents_count` = 233 WHERE `users`.`id` = 2
=> true