On Sat, Jun 6, 2009 at 5:11 PM, Julian<maili...@julianmoritz.de> wrote: > > hello, > > i have a queryset and a model with a manytomany-relationship, let's > say a pizza has toppings. > > my pizza margharita has already some toppings and now i retrieve a > queryset of some more and want to add them to the pizza: > > for topping in toppings: > pizza.toppings.add(topping) > > the problem is: everytime i call add, the pizza is stored again in the > database and an insert statement is done. how can I avoid this? for my > case it would be much better if I could do something like: > > pizza.toppings.add(toppings) > > to add all toppings in one step.
You're very close: pizza.toppings.add(*toppings) will do exactly what you want, and will be executed as a single insert. The '*' operator effectively unrolls the toppings list into a series of arguments - essentially, this call is the equivalent of saying: pizza.toppings.add(toppings[0], toppings[1], toppings[2],... but without actually needing to know the number of toppings in advance. Alternatively, you can completely overwrite the existing set of toppings with a new set: pizza.toppings = toppings This will be issued as a delete and an insert - a delete to remove existing items, and an insert to add the new items. Yours, Russ Magee %-) --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~----------~----~----~----~------~----~------~--~---
