Django Rest FrameWork Add Model With User Foreign Key - django

Question

I'm using Django version 3 and the Rest Framework, i have a model with a user foreignkey.
so every time a model is saved the user also need to be saved.
To be able to add or to edit a model via rest you need to be authenticated using token authentication.
I'm using ClassBasedViews, the problem is that i can't find a way to add a model because in my serializer the field user is excluded because i don't want it to be editable.
models.py:
class Chambre(models.Model):
local_id=models.PositiveIntegerField(unique=True)
nom=models.CharField(max_length=255)
user=models.ForeignKey(User,on_delete=models.CASCADE,blank='true')
class Meta:
unique_together = ('local_id', 'user',)
serializers.py:
class ChambreSerializer(serializers.ModelSerializer):
class Meta:
model = Chambre
exclude =['user',]
views.py:
class ChambreListApi(APIView):
"""
List all chambres, or create a new chambre.
"""
authentication_classes=(TokenAuthentication,)
permission_classes=(IsAuthenticated,)
def get(self, request, format=None):
chambres = Chambre.objects.filter(user=request.user)
serializer = ChambreSerializer(chambres, many=True)
return Response(serializer.data)
def post(self, request, format=None):
serializer = ChambreSerializer(data=request.data)
if serializer.is_valid():
serializer.save(commit=False)
serializer.user=request.user
serializer.save()
return Response(serializer.data, status=status.HTTP_201_CREATED)
return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

Answer 1

Try moving the logic that sets the user to the serializer. By default GenericAPIView will pass the request to the serializer via the context.
class ChambreSerializer(serializers.ModelSerializer):
class Meta:
model = Chambre
exclude =['user',]
def create(self, validated_data):
validated_data["user"] = self.context["request"].user
return super().create(validated_data)

Answer 2

When I followed the accepted solution posted by schillingt, I had to add context={'request': request} when I instantiated the serializer. The Django REST Framework docs mention adding context to a serializer here.
serializers.py
class NoteCreateSerializer(serializer.ModelSerializer):
class Meta:
model = Note
exclude = ['owner',]
def create(self, validated_data):
validated_data['owner'] = self.context['request'].user
return super().create(validated_data)
views.py
#api_view['POST']
def create_note(request):
note_serializer = NoteCreateSerializer(
data = request.data,
context = {'request': request} # this will populate 'self.context'
# in the serializer instance
)
# ...
Thanks so much for this solution, though! It ended an hours-long struggle.

Answer 3

thanks for the reply that was very useful, i've solved it by adding method to serializer.py like this :
class ChambreSerializer(serializers.ModelSerializer):
class Meta:
model = Chambre
exclude =['user',]
def set_the_user(self,request):
self.user=request.user
def create(self, validated_data):
validated_data["user"] = self.user
return super().create(validated_data)
and in the views.py :
def post(self, request, format=None):
serializer = ChambreSerializer(data=request.data)
serializer.set_the_user(request)
if serializer.is_valid():
serializer.save()
return Response(serializer.data, status=status.HTTP_201_CREATED)
return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)