Model class is extended by FriendlyId::Finders::ClassMethods in setup FriendlyId::Finders.setup instead of included.
Model class is extended by FriendlyId::Finders::ClassMethods in setup FriendlyId::Finders.setup instead of included.

Because relation_delegate_class is needed for correct extending of ActiveRecord::AssociationRelation
with finder methods.

norman/friendly_id