自动加载常量时检测到循环依赖(Rails 4,Ruby 2)

Question

CONFIGS/routes.rb中 Shutters和Paints是子资源Jobs.

resources :jobs do
    resources :shutters
    resources :paints
end

app/models/job.rb A Job包含很多Shutters很多Paints.

class Job < ActiveRecord::Base
    has_many :shutters, dependent: :delete_all
    has_many :paints, dependent: :delete_all

    accepts_nested_attributes_for :shutters, allow_destroy: true, :reject_if => lambda { |a| a[:no].blank? }
    accepts_nested_attributes_for :paints, allow_destroy: true, :reject_if => lambda { |a| a[:name].blank? }`

app/models/shutter.rb A Shutter包含属于一个Job和一个Paint.

class Shutter < ActiveRecord::Base
    belongs_to :job
    belongs_to :paint

app/models/paint.rb A Paint属于一个,Job但Shutters在该工作中可被许多人引用.

class Paint < ActiveRecord::Base
    belongs_to :job
    has_many :shutters

无论Jobs#show和Jobs#edit做工精细的代码<%= debug @job.paints %>,如果没有Paints在数据库中已经.但是在添加绘制的那一刻,会引发RuntimeError,"在自动加载常量PAINT时检测到循环依赖性".

修复此错误的最佳方法是什么？

编辑:控制器信息

应用程序/控制器/ jobs_controller.rb

class JobsController < ApplicationController
    before_action :set_job, only: [:show, :edit, :update, :destroy]

    ...

    # GET /jobs/1
    # GET /jobs/1.json
    def show
    end

    # GET /jobs/new
    def new
        @job = Job.new
        @job.shutters.build
        @job.paints.build
    end

    # GET /jobs/1/edit
    def edit
        @job.shutters.build
        @job.paints.build
    end

应用程序/控制器/ shutters_controller.rb

class ShuttersController < ApplicationController
    def new
        @shutter = Shutter.new
    end

    def destroy
        @shutter = Shutter.find(params[:id])
        @job = Job.find(@shutter[:job_id])
        @shutter.destroy
        respond_to do |format|
            format.html {redirect_to @job, notice: 'Shutter was succesfully deleted.' }
        end
    end
end

应用程序/控制器/ paints_controller.rb

class PaintsController < ApplicationController
    def new
        @paint = Paint.new
    end

    def destroy
        @paint = Paint.find(params[:id])
        @job = Job.find(@paint[:job_id])
        @paint.destroy
        respond_to do |format|
            format.html {redirect_to @job, notice: 'Paint was succesfully deleted.' }
        end
    end
end

Answer 1

问题不在于这些.实际上我的Paint模型包含一个名为的字段:type,它是元分类的保留关键字或类似的东西.幸好得到了善良的帮助#RubyOnRails,否则像我这样的新手会尝试从头开始,遇到同样的问题,而且从来没有想过这个.希望这有助于未来的一些Google员工.支付它!