Draper Automatic association decoration

auto_decorate_associations.rb

# Keeping track of associations in activerecord and then going over to draper decorators and adding new associations is
# something that I never much liked - multiple places meant a potential error.
# so here's an easy draper concern that keeps your draper decorators in sync with your underlying models.
# just `include AutoDecorateAssociations` on your decorators and you're done worrying about changing associations on your models.
# If you're working with a model that doesn't have a decorator - like papertrail then it can be easily excluded like :versions below.

module AutoDecorateAssociations
  extend ActiveSupport::Concern

  included do
    decorates_associations *(object_class.reflect_on_all_associations.map(&:name) - [:versions])
  end
end