無法批量分配受保護的屬性：works_attributes，rails嵌套模型中的educations_attributes

Question

我試圖保存模型，稱爲申請人與嵌套工作和教育模型。保存模型時，我得到：

無法批量分配受保護的屬性：works_attributes，educations_attributes錯誤。

我也爲nil：NilClass未定義的方法`klass'得到一個錯誤。我正在使用Rails 3.2。

我的模型代碼：

applicant.rb 

class Applicant < ActiveRecord::Base 
    attr_accessible :first_name, :last_name, :location, :email, :mob_no, :alternative_no, :linkedin, :facebook, :twitter, :message, :resume, :job_id 
    has_many :works, :dependent => :destroy 
    has_many :educations, :dependent => :destroy 
    accepts_nested_attributes_for :works, :reject_if => lambda { |a| a[:content].blank? }, :allow_destroy => true 

    accepts_nested_attributes_for :educations, :reject_if => lambda { |a| a[:content].blank? }, :allow_destroy => true 

end 


work.rb 

class Work < ActiveRecord::Base 
    attr_accessible :applicant_id, :company_name, :description, :end_month, :end_year, :start_month, :start_year, :title 
    belongs_to :applicant 
end 


education.rb 

class Education < ActiveRecord::Base 
    attr_accessible :applicant_id, :end_month, :end_year, :institution_name, :major, :start_month, :start_year, :title 
    belongs_to :applicant 
end 

Answer 1

嘗試，包括工作和教育屬性，這樣的..

class Applicant < ActiveRecord::Base 
    attr_accessible :works_attributes, educations_attributes