Question

I have module in /lib/models/scopes.rb

module Models
    module Scopes
        extend ActiveSupport::Concern
        ...
    end
end

I’m trying to include it from model:

class User < ActiveRecord::Base
  include Models::Scopes
end

And getting error:

NameError: uninitialized constant User::Models

How to solve this trouble? Maybe it`s wrong to keep this types of files in /lib?

Environment:
Rails v3.1
Ruby v1.9.3

Answer 1

Rails doesn’t require files in the lib directory automatically, but you can add to the autoloaded paths in config/application.rb:

config.autoload_paths += %W(#{config.root}/lib)

Restart the server to pick up the new settings.

This will now load the file automatically when the module name is first used. In development mode, you might want to reload the module after every change in order to see the changes without restarting the server. To do that, add it as an eager load path instead:

config.eager_load_paths += %W(#{config.root}/lib)

The scope shouldn’t be a problem as long as you don’t have a Models class or module within User or anywhere else.