Rails4 ActiveRecord has_one :conditions 键已删除

本文介绍了Rails4 ActiveRecord has_one :conditions 键已删除的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在将 RoR3.2 应用程序转换为 v4.2.在某些模型中，我们有这样的结构:

I am converting a RoR3.2 app to v4.2. In some models we have this construct:

  # 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)

这里提出的:

      /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，果然，:conditions 在 Rails4.0.0 中作为 has_one 关联的键被删除，而在 3.2.0 中存在.所以，我的问题是:

Now, I looked at the docs and, sure enough, :conditions is removed as a key for has_one associations in Rails4.0.0 while it is present in 3.2.0. So, my questions are:

has_one :conditions => 键去哪儿了?何时宣布弃用?它的弃用在哪里宣布?什么是替代品?

Where did the has_one :conditions => key go?When was its deprecation announced?Where is its deprecation announced?What is the replacement?

附言如果有人决定 has_one :conditions => 应该是 has_many :conditions => 我尝试切换方法名称并得到相同的错误.现在边缘导轨关联文档仍然将 :conditions 列为 has_many 的有效键，但我得到了同样的错误.这是怎么回事?

P.S. On the off chance that somebody decided that has_one :conditions => should be has_many :conditions => I tried switching the method name and got the same error. Now the edge rails associations documents still list :conditions as a valid key for has_many and yet I get the same error. What is going on?

来自 Rails 升级指南:

From Rails Upgrade Guide:

Rails 4.0 已弃用旧式基于哈希的查找器 API.这个意味着以前接受查找程序选项"的方法没有再做.例如 Book.find(:all, conditions: { name: '1984' })已弃用 Book.where(name: '1984')

据我所知，这是在任何地方唯一提到的弃用.没有提到我可以在 3.2.13 的 ActiveRecord 文档中找到，其中 :conditions 仍然存在，并且没有提到 4.0.2 中的更改，其中 :conditions 完全消失了.

As far as I can determine this is the only mention of the deprecation anywhere. There is no mention that I could find in the ActiveRecord documentation for 3.2.13 where :conditions is still present and there is no mention of the change in 4.0.2 where :conditions is simply gone.

CONDITIONS

Rails4 ActiveRecord has_one :conditions 键已删除

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