DRF PUT Partial Update returning Not Found - django

Question

I'm trying to get to grips with Django and DRF but having some trouble. I would like to make a PUT request to make a partial update on a record.
I currently have the following parts -
From models.py
class MyUser(models.Model):
# Link to User model instance.
user = models.OneToOneField(User)
first_name = models.CharField(max_length=32, null=True, blank=True)
lastname = models.CharField(max_length=32, null=True, blank=True)
joindate = models.DateTimeField(null=False, blank=False)
def __str__(self):
return self.user.username
From api/views.py
class MyUserDetailUpdateView(GenericAPIView, UpdateModelMixin):
queryset = MyUser.objects.all()
serializer_class = MyUserPartialUpdateSerializer
lookup_field = 'user'
def put(self, request, *args, **kwargs):
return self.partial_update(request, *args, **kwargs)
From api/serializers.py
class MyUserPartialUpdateSerializer(serializers.ModelSerializer):
class Meta:
model = MyUser
From urls.py
url(r'^api/userupdate/(?P<user>[\w]+)/$', apiviews.MyUserDetailUpdateView.as_view(), name='my_user_detail_view_api')
For testing I used httpie and try -
http -v PUT http://127.0.0.1:8000/api/userupdate/johndoe/ first_name="Johnny"
The server side is reporting a "Not Found: /api/userdate/johndoe/" and returns a HTTP 404 to the client.
What am I missing to do a partial update?
Thanks

Answer 1

MyUser.user is supposed to be a User instance. You can't use it that way.
You likely want the MyUser associated with the username. In that case, the argument you want to extra from url will be set as lookup_url_kwarg and the lookup_field will do the join across the related model:
class MyUserDetailUpdateView(GenericAPIView, UpdateModelMixin):
queryset = MyUser.objects.all()
serializer_class = MyUserPartialUpdateSerializer
lookup_field = 'user__username'
lookup_url_kwarg = 'user'