Save a model without saving its referred models

[former_member1085063]

Hi Experts,

Is there a good way to save a model without causing the implicit saving of referred models?

For instance, a PriceRowModel contains a product attribute that is a reference to a ProductModel.
Due to that, in the following code example (very simplified) the product is implicitly being saved when I save the product row:

 public void updateProduct(String code, ProductChangesBean changes) {
     ProductModel product = productService.getProductForCode(catVersion, code);

     // ...do some changes to the product...
     updateProductUnit(product, changes.getUnitC());
     // ...do more changes to the product...

     modelService.save(product);
 }

 public void updateProductUnit(ProductModel product, UnitModel unit)
     if (unit == null) {
         return;
     }

     product.setUnit(unit);
     for (PriceRowModel priceRow : product.getEurope1Prices()) {
         priceRow.setUnit(unit);
         modelService.save(priceRow);   // <== this is saving priceRow's and product
     }
 }

I would like updateProductUnit(..) to save only the price rows without saving the product referred by them.

I have tried detaching the product before saving the price row, but the product is still being saved with it.
I also tried with not saving the price row, to see if the saving of the product will "cascade" that. But it doesn't.
Any other ideas?

Cheers,
Carlos