Rails嵌套属性给出错误：未定义的方法`build_priority'

Question

整天但找不到简单的问题。为什么我的嵌套属性不能使用此关联？

Here is error: NoMethodError (undefined method `build_priority' for
#<Audit:0x134234jnjn2j>):   app/controllers/audits_controller.rb:43:in `new'

audits_controller.rb

 def new
    @audit = Audit.new
    @audit.build_priority 
 end

audit.rb模型

  has_many :priorities, dependent: :destroy
  accepts_nested_attributes_for :priorities, allow_destroy: true, reject_if: :all_blank

priority.rb模型

class Priority < ActiveRecord::Base
  belongs_to :audit
  accepts_nested_attributes_for :audit, allow_destroy: true, reject_if: :all_blank
end

Answer 1

 def new
    @audit = Audit.new
    @audit.priorities.build
 end

楷模：-

class Audit < ActiveRecord::Base
  has_many :priorities, dependent: :destroy
  accepts_nested_attributes_for :priorities, allow_destroy: true, reject_if: :all_blank

end

class Priority < ActiveRecord::Base
  belongs_to :audit
  #accepts_nested_attributes_for :audit, allow_destroy: true, reject_if: :all_blank
end