Question

根据以下模式:

rails g model Menu name:string
rails g model MenuHeader mh_name:string menu_id:integer

class Menu < ActiveRecord::Base
    has_many :menu_headers
    attr_accessible :menu_headers_attributes, :name
end

class MenuHeader < ActiveRecord::Base
    belongs_to :menu
end

通过铁路网补充,我得到:

Menu.create({"name"=>"My first menu",:menu_headers_attributes=>{:mh_name => "here is my name"}})
ActiveRecord::UnknownAttributeError: unknown attribute: menu_headers_attributes

添加这种内容的正确分类是什么?

我能否删除“可以获取”的tr子?

th

edit #1 from bricker s answer (thbtw, really appreciate!)

class Menu < ActiveRecord::Base
  has_many :menu_headers
  attr_accessible :name
  accepts_nested_attributes_for :menu_headers
end  

 ruby-1.9.2-p290 :001 > Menu.create({"name"=>"My first menu",:menu_headers_attributes=>{"mh_name" => "here is my name"}})
 TypeError: can t convert Symbol into Integer
from /Users/jt/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.0/lib/active_record/nested_attributes.rb:395:in `[] 
from /Users/jt/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.0/lib/active_record/nested_attributes.rb:395:in `block in assign_nested_attributes_for_collection_association 
from /Users/jt/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.0/lib/active_record/nested_attributes.rb:395:in `map 
from /Users/jt/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.0/lib/active_record/nested_attributes.rb:395:in `assign_nested_attributes_for_collection_association 
from /Users/jt/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.0/lib/active_record/nested_attributes.rb:287:in `menu_headers_attributes= 
from /Users/jt/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.0/lib/active_record/base.rb:1745:in `block in assign_attributes

Answer 1

阁下:

accepts_nested_attributes_for :menu_headers

页: 1 添加<条码>menu_headers_attributes,作为<条码>。

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