Auto load path rails

# config/application.rb
config.autoload_paths << Rails.root.join('lib')
# or
config.autoload_paths += %W( 
  #{config.root}/...
  #{config.root}/...
  #{config.root}/...
) # that’s why concerns (model/controller) do not have Concern as namespace

# to check paths loaded
puts ActiveSupport::Dependencies.autoload_paths

Source: til.hashrocket.com

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