ruby-on-rails-3 - Rails 3.2.3：如何批量分配关联模型？

Question

我有一个 rails 3.2.3，我有一个包含两个嵌套模型的表单，当我尝试提交表单时，我收到此错误：

ActiveModel::MassAssignmentSecurity::Error in ExperimentsController#create

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

这是我的模型：

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

我可以添加attr_accessible一个字段，但是，嵌套模型呢？

Answer 1

尝试添加：

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

在你的实验模型中。