saving a one-to-many

I feel like I'm doing this in more of an idiotic, rather than idiomatic
fashion.

I have something called a ServiceOrder, which can contain many line items,
for which I've created an OrderLine. Each OrderLine associates one or more
Products with any particular ServiceOrder.

I'm wondering how to save a ServiceOrder ( one-to-many ) in the most succinct
way possible. Do I save the ServiceOrder first, then simply begin adding
OrderLines, as I do below - or is there a more direct/elegant/fashionable way
of doing this?


.../domain/ServiceOrder.groovy:

class ServiceOrder {

   static hasMany = [ items : OrderLine ]

   static constraints = {
      contact( nullable : false )
      creditCard( nullable : false )
   }

   Contact contact
   CreditCard creditCard

}

.../domain/OrderLine.groovy:

class OrderLine {

   static belongsTo = ServiceOrder

   /* are the following constraints desired/valid?
   static constraints = {
      serviceOrder( nullable : false )
      product( nullable : false )
   }
   */

   Integer quantity = 1

   ServiceOrder serviceOrder
   Product product

}


.../controllers/ServiceOrder.groovy:

   // am I doing this "correctly"?
   private save = {

      def serviceOrder = new ServiceOrder(
         contact    : new Contact( params ),
         creditCard : new CreditCard( params )
      )
      serviceOrder.save()

      // there should be a loop here, but I'm simplifying for
      // sake of brevity
      serviceOrder.addOrderLine(
         new OrderLine(
            serviceOrder : serviceOrder,
            product      : Product.get( params.productId )
         )
      )
      serviceOrder.save()

      [ serviceOrder : serviceOrder ]

   }




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