Question

我正在将RoR3.2应用转换为v4.2。在某些模型中，我们有这种结构：

  # A correspondent can have only one currently active client role or
  # it may have none.
  has_one           :active_client,   :class_name => 'Client', 
                    :conditions => IsActiveRow

我收到此错误：

      Unknown key: :conditions. Valid keys are: :class_name, :class,
 :foreign_key, :validate, :autosave, :dependent, :primary_key,
 :inverse_of, :required, :as, :foreign_type
 (ActionView::Template::Error)

这里提到了：

      /home/byrnejb/Projects/Software/theHeart/code/proforma/libexec
/bundle/lib/ruby/2.2.0/gems/activesupport-4.2.0/lib/active_support
/core_ext/hash/keys.rb:75:in `block in assert_valid_keys'

      /home/byrnejb/Projects/Software/theHeart/code/proforma/libexec
/bundle/lib/ruby/2.2.0/gems/activesupport-4.2.0/lib/active_support
/core_ext/hash/keys.rb:73:in `each_key'

      /home/byrnejb/Projects/Software/theHeart/code/proforma/libexec
/bundle/lib/ruby/2.2.0/gems/activesupport-4.2.0/lib/active_support
/core_ext/hash/keys.rb:73:in `assert_valid_keys'

      /home/byrnejb/Projects/Software/theHeart/code/proforma/libexec
/bundle/lib/ruby/2.2.0/gems/activerecord-4.2.0/lib
/active_record/associations/builder/association.rb:82:in `validate_options'

      /home/byrnejb/Projects/Software/theHeart/code/proforma/libexec
/bundle/lib/ruby/2.2.0/gems/activerecord-4.2.0/lib
/active_record/associations/builder/association.rb:62:in `initialize'

      /home/byrnejb/Projects/Software/theHeart/code/proforma/libexec
/bundle/lib/ruby/2.2.0/gems/activerecord-4.2.0/lib
/active_record/associations/builder/association.rb:47:in `new'

      /home/byrnejb/Projects/Software/theHeart/code/proforma/libexec
/bundle/lib/ruby/2.2.0/gems/activerecord-4.2.0/lib/active_record
/associations/builder/association.rb:47:in `create_builder'

      /home/byrnejb/Projects/Software/theHeart/code/proforma/libexec
/bundle/lib/ruby/2.2.0/gems/activerecord-4.2.0/lib
/active_record/associations/builder/association.rb:35:in `build'

      /home/byrnejb/Projects/Software/theHeart/code/proforma/libexec/
bundle/lib/ruby/2.2.0/gems/activerecord-4.2.0/lib/
active_record/associations.rb:1385:in `has_one'

      /home/byrnejb/Projects/Software/theHeart/code/proforma/app/models
/orm_active_record/correspondent.rb:14:in `<class:Correspondent>'

      /home/byrnejb/Projects/Software/theHeart/code/proforma/app/models
/orm_active_record/correspondent.rb:1:in `<top (required)>'
. . .

现在，我查看了文档，并且确实如此：条件被移除作为Rails4.0.0中has_one关联的关键，而它存在于3.2.0中。所以，我的问题是：

has_one：conditions =＆gt;在哪里？关键去？什么时候宣布弃用？它的弃用在哪里宣布？什么是替代品？

P.S。如果有人决定has_one :conditions =>应该has_many :conditions =>，我尝试切换方法名称并得到相同的错误。现在，边缘轨道关联文档仍将:conditions列为has_many的有效密钥，但我得到了相同的错误。发生了什么事？

来自Rails升级指南：

Rails 4.0已弃用旧式基于散列的finder API。这个表示以前接受＆＃34; finder选项＆＃34;没有做得更久。例如，Book.find（：all，conditions：{name：＆＃39; 1984＆＃39;}）已被弃用，以支持Book.where（名称：＆＃39; 1984＆＃39;）

据我所知，这是唯一提及任何地方的弃用。没有提及我可以在3.2.13的ActiveRecord文档中找到:conditions仍然存在的地方，并且没有提到4.0.2中:conditions已经消失的变化

Answer 1

如果你看一下official guide to upgrading rails，就会提到弃用。通常，where是conditions的替代品。它应该作为lambda传递。

在您的情况下，它看起来像：

has_one :active_client, -> { where IsActiveRow }, :class_name => 'Client'

Rails4 ActiveRecord has_one：条件键被删除

1 个答案: