I am trying to reference an association extension but it errors with:
NameError (uninitialized constant User::ListerExtension):
app/models/user.rb:2:in `<class:User>'
Here is my implementation:
class User < ActiveRecord::Base
include ListerExtension
has_and_belongs_to_many :roles, :uniq => true, :extend => Lister
module ListerExtension
def lister
self.map(&:to_s).join(', ')
end
end
I am using Rails v3.1.3.
Andrew Marshall has an excellent point about the auto-load setup (see the question he links for more on that), but also: Because you named your class ListerExtension
, Rails will be looking for a file named lister_extension.rb
- not lister.rb
. It's smart, but it's not that smart.