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Autoloading models not working

Giancarlo Corzo asked in Rails


I have this model structure


I have used this autoloading in my application.rb so I don't have to deal with modules everytime I have create a folder in my models

config.autoload_paths += Dir[Rails.root.join('app', 'models', '**/')]

Normally I don't have any problem but this time I get an autoload issue:

Unable to autoload constant Survey::Question, expected /home/gian/repository/capitan/app/models/survey/question.rb to define it

I'm using STI in the question.rb model so I can have several models with custom code in it.

When I access each model I don't have any problem but when I try to do this

@survey = Survey.find(1)

This are my model definitions:

class Survey < ActiveRecord::Base
  has_many :questions
  validates :name, :presence => true

class Question < ActiveRecord::Base
  belongs_to :survey, :inverse_of => :questions
  has_many :answers

  has_and_belongs_to_many :sprint_users

  default_scope { order(:position) }

  validates :survey, :question_text, :presence => true


class TeacherSprint < Question

From what I can tell from the error message it's expecting that the question is inside a module but I don't get this kind of error in any other model so it's strange.

If you want to check the code you can access the code on github because it's an open source code.


I fixed it, the problem was related to the name of the folders for some reason I had to change from



Ah glad you got that fixed. I was going to reply yesterday and got distracted. I figured that there was something up with the folder naming and the naming of the classes. Rails always expects you to have those names match up which the error tries to tell you, but it can never point out the exact problem.

Usually when you see the error like "Unable to autoload constant Survey::Question, expected /home/gian/repository/capitan/app/models/survey/question.rb to define it" then you know you've made a typo or forgot a module name somewhere.

Glad it's working! 🤘

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