Change model-object at PUT and update before GET in django-rest-framework -


sorry confusing title, don't know how describe better.

i need run model-function on object editing using put in django-rest-framework, uses of new data put calculate new values should save in same model.

example:

  • an item {'amount': 2, 'price': 0, 'total': 0} stored in database.
  • i updating price 1 using normal put request using django-rest-framework.
  • the model have helperfunction called update_total() need call update total field in database (to, in case 2 (2*1)).
  • the item updated in database, response returned django-rest-framework still showing total=0. after getting object on new, total 2 expected.

i need response 2 in response put, not after regrab of object. how?

i have tried several things (which doesn’t work):

  • updating attrs in validator new value.
  • using post_save() in listcreateapiview update data.
  • using pre_save() in listcreateapiview
  • updating instance in restore_object() (even though isn't purpose)

does bug? or there trick?

i kinda found solution, feels dirty..

in serializers restore_object put code this:

new_values = instance.update_counters() k, v in new_values.items():     self.data[k] = v

and in models update_counters() function, returning dict of changed..


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