Circular dependency detected while autoloading constant (Rails 4, Ruby 2)
ruby, ruby-2.1, ruby-on-rails, ruby-on-rails-4, sqlite
Solution
The problem was none of these. It was actually that my `Paint` model contained a field named `:type`, which is a reserved keyword for meta-classing or something as such. Was thankfully helped by the kind folks at `#RubyOnRails`, else a newbie like me would have tried to start from scratch, run into the same problem, and would have never have figured this out. Hopefully this helps some future Googler. Pay it forward!
Problem
configs/routes.rb `Shutters` and `Paints` are subresources of `Jobs`. ``` resources :jobs do resources :shutters resources :paints end ``` app/models/job.rb A `Job` contains many `Shutters` and many `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` contains belongs to one `Job` and one `Paint`. ``` class Shutter < ActiveRecord::Base belongs_to :job belongs_to :paint ``` app/models/paint.rb A `Paint` belongs to one `Job` but can be referenced by many `Shutters` in that job. ``` class Paint < ActiveRecord::Base belongs_to :job has_many :shutters ``` Both `Jobs#show` and `Jobs#edit` work fine with the code `<%= debug @job.paints %>` if there are no `Paints` already in the database. But the moment a paint is added, a RuntimeError is raised, "Circular dependency detected while autoloading constant PAINT". What's the best way to fix this error? Edit: Controller info app/controllers/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 ``` app/controllers/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 ``` app/controllers/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 ```