Rails的依赖：摧毁的原因引发ArgumentError

我在轨用户模式应用程序如下Rails的依赖：摧毁的原因引发ArgumentError

class User < ActiveRecord::Base 
    has_many :parts, dependent: :destroy 
    has_many :assemblies, dependent: :destroy 
    has_many :packages, dependent: :destroy 
    has_many :manufacturers, dependent: :destroy 
    //more code here 
end

我也有一些其他车型dependent: :restrict。

当我运行在rails console下，我得到一个ArgumentError：

u = User.first 
u.parts

到u.parts的调用提供了以下错误信息：

ArgumentError: Unknown key: dependent 
    from /home/david/.rvm/gems/ruby-1.9.3-p0/gems/activesupport-3.2.1/lib/active_support/core_ext/hash/keys.rb:44:in `block in assert_valid_keys' 
    from /home/david/.rvm/gems/ruby-1.9.3-p0/gems/activesupport-3.2.1/lib/active_support/core_ext/hash/keys.rb:43:in `each_key' 
    from /home/david/.rvm/gems/ruby-1.9.3-p0/gems/activesupport-3.2.1/lib/active_support/core_ext/hash/keys.rb:43:in `assert_valid_keys' 
    from /home/david/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.2.1/lib/active_record/associations/builder/association.rb:33:in `validate_options' 
    from /home/david/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.2.1/lib/active_record/associations/builder/association.rb:24:in `build' 
    from /home/david/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.2.1/lib/active_record/associations/builder/collection_association.rb:23:in `build' 
    from /home/david/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.2.1/lib/active_record/autosave_association.rb:139:in `build' 
    from /home/david/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.2.1/lib/active_record/associations/builder/has_and_belongs_to_many.rb:8:in `build' 
    from /home/david/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.2.1/lib/active_record/associations/builder/collection_association.rb:13:in `build' 
    from /home/david/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.2.1/lib/active_record/associations.rb:1600:in `has_and_belongs_to_many' 
    from /home/david/code/PartSorter/app/models/part.rb:5:in `<class:Part>' 
    from /home/david/code/PartSorter/app/models/part.rb:1:in `<top (required)>' 
    from /home/david/.rvm/gems/ruby-1.9.3-p0/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:469:in `load' 
    from /home/david/.rvm/gems/ruby-1.9.3-p0/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:469:in `block in load_file' 
    from /home/david/.rvm/gems/ruby-1.9.3-p0/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:639:in `new_constants_in' 
    from /home/david/.rvm/gems/ruby-1.9.3-p0/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:468:in `load_file' 
... 12 levels... 
    from /home/david/.rvm/gems/ruby-1.9.3-p0/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:554:in `get' 
    from /home/david/.rvm/gems/ruby-1.9.3-p0/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:588:in `constantize' 
    from /home/david/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.2.1/lib/active_record/inheritance.rb:111:in `block in compute_type' 
    from /home/david/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.2.1/lib/active_record/inheritance.rb:109:in `each' 
    from /home/david/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.2.1/lib/active_record/inheritance.rb:109:in `compute_type' 
    from /home/david/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.2.1/lib/active_record/reflection.rb:172:in `klass' 
    from /home/david/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.2.1/lib/active_record/associations/association.rb:117:in `klass' 
    from /home/david/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.2.1/lib/active_record/associations/association.rb:165:in `find_target?' 
    from /home/david/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.2.1/lib/active_record/associations/collection_association.rb:332:in `load_target' 
    from /home/david/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.2.1/lib/active_record/associations/collection_proxy.rb:44:in `load_target' 
    from /home/david/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.2.1/lib/active_record/associations/collection_proxy.rb:88:in `method_missing' 
    from /home/david/.rvm/gems/ruby-1.9.3-p0/gems/railties-3.2.1/lib/rails/commands/console.rb:47:in `start' 
    from /home/david/.rvm/gems/ruby-1.9.3-p0/gems/railties-3.2.1/lib/rails/commands/console.rb:8:in `start' 
    from /home/david/.rvm/gems/ruby-1.9.3-p0/gems/railties-3.2.1/lib/rails/commands.rb:41:in `<top (required)>' 
    from script/rails:6:in `require' 
    from script/rails:6:in `<main>'

我不知道为什么，这ISN” t工作 - 我按照指南here添加dependent部分，但它不工作。有任何想法吗？

编辑：是的part.rb的内容如下：

class Part < ActiveRecord::Base 
    has_many :part_packages 
    has_many :packages, through: :part_packages 
    belongs_to :manufacturer 
    has_and_belongs_to_many :assemblies, :dependent => :restrict 
    belongs_to :user 


    validates :name, :user_id, :presence => true 

    def quantity 
    @quantity = 0 
    self.part_packages.each do |pp| 
     @quantity += pp.quantity 
    end 
    @quantity 
    end 
end

来源

2012-04-16 David Robertson

错误出现在'app/models/part.rb'中，所以请提供代码而不是'user.rb'。 – 2012-04-16 21:37:09

我已经添加了上面的源代码。 – 2012-04-16 21:41:30

当您从控制台尝试“Part.first”和“u.parts.size”时会发生什么？（缩小范围） – IAmNaN 2012-04-16 21:50:31

:dependent不是has_and_belongs_to_many有效的选项，所以你需要摆脱它，写自己的解决方案，它是你想。

或者，您可能希望有一个明确的连接模型，而不是使用has_and_belongs_to_many。这样你可以使用:dependent作为与连接模型的关系。

来源

2012-04-16 21:41:39

完美，就是这样。谢谢：） – 2012-04-16 21:44:23

Rails的依赖：摧毁的原因引发ArgumentError

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