Add user to model before saving with DjangoModelFormMutation - django-forms

Question

I have a Django Log model which has many-to-one with a User
from django.db import models
class Log(models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE)
...
I have a Django form for the Log
from django.forms import ModelForm
class LogForm(ModelForm):
class Meta:
model = Log
exclude = ("user",)
I have a graphene-django mutation to enable Log creation
import graphene
from graphene_django import DjangoObjectType
from graphene_django.forms.mutation import DjangoModelFormMutation
class LogType(DjangoObjectType):
class Meta:
model = Log
fields = "__all__"
class CreateLogMutation(DjangoModelFormMutation):
log = graphene.Field(LogType)
class Meta:
form_class = LogForm
How do I set Log.user to the current user before saving? With Django class-based views you would do as follows:
from django.views.generic import CreateView
class LogCreateView(CreateView):
model = Log
form_class = LogForm
def form_valid(self, form):
form.instance.user = self.request.user
return super().form_valid(form)
How is this achieved with graphene-django?

Answer 1

Override perform_mutate and add the user there. pefrom_mutate is called after Django's Form.is_valid.
class CreateLogMutation(DjangoModelFormMutation):
log = graphene.Field(LogType)
class Meta:
form_class = LogForm
#classmethod
def perform_mutate(cls, form, info):
form.instance.user = info.context.user
return super().perform_mutate(form, info)