Question

我有一个名为“User”的模型，它与“Address”模型有很多关联。

当我执行User.new.addresses.build时，我收到以下错误，

    ArgumentError: wrong number of arguments (1 for 0)
    from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/reflection.rb:162:in `initialize'
    from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/reflection.rb:162:in `new'
    from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/reflection.rb:162:in `build_association'
    from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/associations/association_collection.rb:423:in `build_record'
    from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/associations/association_collection.rb:102:in `build'
    from (irb):10

当我在地址模型中添加初始化方法时会发生这种情况。

非常感谢任何帮助...

编辑：

初始化方法没有参数，看起来像这个

class Address < ActiveRecord::Base
  attr_accessor :test

  def initialize
    test = "manu"
  end
end

Answer 1

after_initialize钩子可以满足您的目的

class Address < ActiveRecord::Base
  attr_accessor :test
  after_initialize :init

  def init
    @test = "manu"
  end
end

Answer 2

建议不要覆盖ActiveRecord继承类的initialize方法。如果要添加自定义初始化，请使用after_initialize回调。查看所有ActiveRecord callbacks的rails api。

Rails Active Record - 如何在关联模型中存在初始化方法时使用构建？

2 个答案: