module AASM::Persistence::MongoidPersistence::ClassMethods

def aasm_create_scope(state_machine_name, scope_name)
  scope_options = lambda {
    send(
      :where,
      { aasm(state_machine_name).attribute_name.to_sym => scope_name.to_s }
    )
  }
  send(:scope, scope_name, scope_options)
end