gistfile1.rb

class Escalation

  scope :active, where(:current_escalation_state_id => EscalationState.active)

  def self.visible_to(account)
    where(:escalation_definition_id => EscalationDefinition.visible_to(account))
  end
end

__END__

[Test]>> Escalation.visible_to(a).active.class
=> ActiveRecord::Relation
[Test]>> Escalation.active.visible_to(a).class
=> Array