Rails 3.2.3：如何批量分配相關模型？

Question

我有一個導軌3.2.3，我有兩個嵌套模型形式，當我嘗試提交表單，我得到這個錯誤：

ActiveModel::MassAssignmentSecurity::Error in ExperimentsController#create 

Can't mass-assign protected attributes: descriptions_attributes, circuits_attributes 

這裏是我的模型：

class Experiment < ActiveRecord::Base 
    attr_accessible :title, :intro_text 

    has_many :circuits, :dependent => :destroy 
    has_many :descriptions, :dependent => :destroy 


    accepts_nested_attributes_for :descriptions, :reject_if => lambda { |a| a[:data].blank? }, :allow_destroy => true 
    accepts_nested_attributes_for :circuits, :reject_if => lambda { |a| a[:data].blank? }, :allow_destroy => true 

end 

class Circuit < ActiveRecord::Base 
    attr_accessible :data, :title 

    belongs_to :experiment 
end 

class Description < ActiveRecord::Base 
    attr_accessible :data, :title 

    belongs_to :experiment 
end 

我可以爲一個字段添加attr_accessible，但是，嵌套模型呢？

Answer 1

嘗試增加：

class Experiment < ActiveRecord::Base 
    attr_accessible :title, :intro_text, :descriptions_attributes, :circuits_attributes 
    [...] 

在你的實驗模型。