wrong constant name ....... inferred by Module from file

Question

Ruby 2.7 Rails 7.0.3.1

/home/felipe/.rvm/gems/ruby-2.7.1/gems/zeitwerk-2.6.0/lib/zeitwerk/loader.rb:359:in `rescue in block in set_autoloads_in_dir': wrong constant name Usersession.controller inferred by Module from file (Zeitwerk::NameError)

Possible ways to address this:

Tell Zeitwerk to ignore this particular file.
Tell Zeitwerk to ignore one of its parent directories.
Rename the file to comply with the naming conventions.
Modify the inflector to handle this case.

usersession.controller.rb:

    class SessionsController < ApplicationController

    def new
    redirect_to user_contacts_path(current_user) if user_signed_in?
    end

    def create
    user = User.find_by(email: params[:session][:email].downcase)
    if user && user.authenticate(params[:session][:password])
    sign_in(user)
    redirect_to user_contacts_path(current_user)
    else
    flash.now[:danger] = 'Email e Senha inválidos'
    render 'new'
    end
     end

     def destroy
    sign_out
    flash[:warning] = 'Logout realizado com sucesso'
    redirect_to entrar_path
     end


    end

application.rb :

      require_relative "boot"
      require "rails/all"

      # Require the gems listed in Gemfile, including any gems
      # you've limited to :test, :development, or :production.
      Bundler.require(*Rails.groups)

      module App
        class Application < Rails::Application
        # Initialize configuration defaults for originally generated Rails version.
        config.load_defaults 7.0
        # Configuration for the application, engines, and railties goes here.
        #
        # These settings can be overridden in specific environments using the files
        # in config/environments, which are processed later.
        #
        # config.time_zone = "Central Time (US & Canada)"
        # config.eager_load_paths << Rails.root.join("extras")
           end
         end

Pedro Paiva · Answer 1 · 2022-08-02T01:53:35.803

It seems to me that the problem you're facing is because the filename of the controller is different from the class: userssesions.controller != SessionsController. Zeitwerk uses the name of the file to find the class. You have two options:

Rename the file to sessions_controller.rb
Rename SessionsController to UsersessionController. PS: remember to replace "." with "_" in the filename. Ex: usersessions_controller, instead of usersesions.controller.

After doing that, restart your server.

Why this error is happening? Because we're not following Zeitwerk convention:

To have a file structure Zeitwerk can work with, just name files and directories after the name of the classes and modules they define.

Example:

lib/my_gem.rb         -> MyGem
lib/my_gem/foo.rb     -> MyGem::Foo
lib/my_gem/bar_baz.rb -> MyGem::BarBaz
lib/my_gem/woo/zoo.rb -> MyGem::Woo::Zoo

Reference: https://github.com/fxn/zeitwerk#file-structure

wrong constant name ....... inferred by Module from file

1 Answers1