gistfile1.txt

public static void save(Long id /*, Shop shop*/) {

    Shop byId = Shop.findById(id);
	
    // set owner manually (dont edit from FE)
    User user = User.find("byEmail", Security.connected()).first();
    byId.owner = user;
    
    Binder.bind(byId, "shop", request.params);
    
    // Validate
    validation.valid(byId);
    if (validation.hasErrors()) 
        render("@form", byId);

    byId.save();
    index();
}