Question

我知道我可以使用反馈,但这应当是可行的。我进行了长时间的搜寻,没有结果。这是我所认为的工作。

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

没有按计划开展工作,因为你可以看到其更新文件——面面面,而不是发表——笔记。

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

Answer 1

Use the counter_culture gem。

Add three columns to the users table.

add_column :users, :draft_documents_count, :integer, null: false, default: 0
add_column :users, :published_documents_count, :integer, null: false, default: 0
add_column :users, :private_documents_count, :integer, null: false, default: 0

决定。模式

class Document
  counter_culture :user, :column_name => Proc.new do |doc|
    if %w(draft published private).include?(doc.status) 
      "{doc.status}_documents_count"
    end
  end    
end

• 在青春角维持指挥,以为目前各行预计
```
Document.counter_culture_fix_counts
```

Old answer

您可向<条码>用户_cache/code>选项提供对应栏目名称(从true除外)。

class Document < ActiveRecord::Base
  belongs_to :user, :counter_cache => true
  belongs_to :user, :inverse_of => :draft_docs, 
                                   :counter_cache => :draft_docs_count
  belongs_to :user, :inverse_of => :published_docs, 
                                   :counter_cache => :published_docs_count
  belongs_to :user, :inverse_of => :private_docs, 
                                   :counter_cache => :private_docs_count
end

Answer 2

This is because you use the same name for all the associations.

belongs_to :user, :counter_cache => true
belongs_to :user_doc, :class_name => "User", 
           :inverse_of => :draft_docs, :counter_cache => :draft_docs_count

这一功能通过增加增减,以增减计数,而就您而言,目标是<编码>文件>。既然你用同一名称做一切事。

Old answer

友情链接