rubyuninitialized-constant

NameError: uninitialized constant #<Class:0x00007fadd32ea580>::Searchable

While debugging an unrelated issue in rspec, I'm coming across issues with constant loading. The setup is as follows:

# app/models/foo.rb

class Foo << ApplicationRecord
  include Foo::Searchable
end

# app/models/foo/searchable.rb

module Foo::Searchable
  extend ActiveSupport::Concern

  included do
    #yada yada
  end
end

I received the following error while debugging. NameError: uninitialized constant #<Class:0x00007fadd32ea580>::Searchable Changing the naming to Foos::Searchable with corresponding folder move does fix the issue but I would like to understand what is actually happening.

Rails 6.0.3.1 Ruby 2.6.6

Solution

  • This turns out to be caused by incompatibility with Byebug. Byebug stops the events Zeitwerk uses for autoloading to fire off in a debugging session. The issue is described here.

    The << was a typo and would not result in that error.