Django Rest Framework add field to model before saving in viewset using ModelSerializer

Question

Using Django Rest Framwork, I want to set a field that can not be null in the Database, but that's not included in the fields tuple on the Meta class, before i actually save the model that the ModelSerializer manages.

In my ViewSet, I define perform_create and want to do something like this:

serializer.fields.new_field = new_field_id

where new_field is a Foreign Key on my model and new_field.id is the id of the model i just fetched using a value set on the cookie.

Does anyone know a clean solution to this?

Thanks!

Checkout this question

Todor
– Todor

2015-03-01 05:53:07 +00:00
Commented Mar 1, 2015 at 5:53 — Todor
– Todor, Commented Mar 1, 2015 at 5:53
@Todor Another solution. Three already! Thanks

ZvL
– ZvL

2015-03-01 11:49:29 +00:00
Commented Mar 1, 2015 at 11:49 — ZvL
– ZvL, Commented Mar 1, 2015 at 11:49

soooooot · Accepted Answer · 2015-03-01 02:10:41Z

5

Do you mean this..?

def perform_create(self, serializer):
    serializer.save(user=self.request.user)

answered Mar 1, 2015 at 2:10

soooooot

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2 Comments

ZvL Over a year ago

Hmm i tried that as well, it then tells me: user is an invalid keyword argument for this function. I settled for a middleware solution where i modify request.POST on each request.method == "POST". This works pretty good since i need to add the field to multiple resources and can depend on DRF's built in validators. It helps with DRY though i read it's not a great idea to modify request.POST

ZvL Over a year ago

Ok shucks, PyCharm had me there. It suggested a different kwarg, i just realised the name of my model field was different from the one PyCharm suggested.. I appears i now have two valid solutions. Great & Thanks!

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