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我的Page模型中有这个关联。

  has_many :networks, :finder_sql => proc {"SELECT * FROM network_pages WHERE page1_id = #{id} OR page2_id = #{id}"}

Networks它通过模型中的页面 id检索NetworkPages。他们的表格如下：

1.9.3p392 :010 > Network
 => Network(id: integer, name: string, created_at: datetime, updated_at: datetime, column1: string, column2: string, inversion: boolean) 
1.9.3p392 :011 > NetworkPage
 => NetworkPage(id: integer, network_id: integer, page1_id: integer, page2_id: integer, created_at: datetime, updated_at: datetime)

但是，当调用上面的关联时，我只得到记录的 id 和时间戳列作为回报：

1.9.3p392 :014 > page.networks
 => [#<Network id: 1, created_at: "2013-04-07 09:07:05", updated_at: "2013-04-07 09:07:05">]

它返回正确的类，但我不能调用其他属性：

1.9.3p392 :015 > page.networks.first.class
 => Network(id: integer, name: string, created_at: datetime, updated_at: datetime, column1: string, column2: string, inversion: boolean) 
1.9.3p392 :016 > page.networks.first.name
ActiveModel::MissingAttributeError: missing attribute: name
    from (irb):16
    from /Users/RyanKing/.rvm/gems/ruby-1.9.3-p392/gems/railties-3.2.12/lib/rails/commands/console.rb:47:in `start'
    from /Users/RyanKing/.rvm/gems/ruby-1.9.3-p392/gems/railties-3.2.12/lib/rails/commands/console.rb:8:in `start'
    from /Users/RyanKing/.rvm/gems/ruby-1.9.3-p392/gems/railties-3.2.12/lib/rails/commands.rb:41:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

但是使用没有问题Network.find

1.9.3p392 :017 > Network.find(1).name
  Network Load (0.5ms)  SELECT `networks`.* FROM `networks` WHERE `networks`.`id` = 1 LIMIT 1
 => "First Network Name"

我不太明白为什么会这样，如何检索所有Network模型属性？

4

1 回答 1

1

您的 finder_sql 从错误的表中选择 - network_pages 而不是网络

于 2013-04-07T12:42:42.837 回答