+4  A: 

Because the productToEdit is a new product object populated from the form fields and if you don't have fields for the user how would you populate the User entity

For a "workaround", first get the product from the db, edit this with the edited fields in the productToEdit and save to db

TT  2009-03-08 18:27:56
I thought this was the case of the object "being new" coming from the view. I don't need to change the user in my scenario. The user is only in the relation to track who created the product. Thanks for this info, I will work around it.
jesperlind  2009-03-08 19:29:20
+1  A: 

You can also choose to use a custom ModelBinder that understands your model & persistence strategy to fully load the graph back into memory.

Ben Scheirman  2009-03-08 19:57:54
Thanks that sounds promising, I'll look into that. I solved the above by problem attaching the original object in the Edit-function in the service. In this way it passes the same validation I got when I create a Product. (Product must have User)
jesperlind  2009-03-10 08:32:25

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