You will have to override the default behavior of how generics.ListCreateAPIView creates an object.

class PhotoListAPIView(generics.ListCreateAPIView):
queryset = Post.objects.filter(hidden=False)
authentication_classes = (SessionAuthentication, BasicAuthentication)
permission_classes = (IsAuthenticated,)


def get_serializer_class(self):
if self.request.method == 'POST':
return CreatePostSerializer
else:
return ListPostSerializer


def create(self, request, *args, **kwargs):
# Copy parsed content from HTTP request
data = request.data.copy()


# Add id of currently logged user
data['user'] = request.user.id


# Default behavior but pass our modified data instead
serializer = self.get_serializer(data=data)
serializer.is_valid(raise_exception=True)
self.perform_create(serializer)
headers = self.get_success_headers(serializer.data)
return Response(serializer.data, status=status.HTTP_201_CREATED, headers=headers)

The .get_serializer_class() is not necessary as you can specify which fields are read-only from your serializer, but based on the projects I have worked on, I usually end up with 'asymmetric' serializers, i.e. different serializers depending on the intended operation.

Off the top of my head, you can just override the perform_create() method:

class PhotoListAPIView(generics.ListCreateAPIView):
...
def perform_create(self, serializer):
serializer.save(user=self.request.user)

Give that a shot and let me know if it works

You can use CurrentUserDefault:

user = serializers.PrimaryKeyRelatedField(
read_only=True,
default=serializers.CurrentUserDefault()
)

@DaveBensonPhillips's answer might work in your particular case for some time, but it is not very generic since it breaks OOP inheritance chain.

ListCreateAPIView inherits from CreateModelMixin which saves the serializer already. You should always strive to get the full chain of overridden methods executed unless you have a very good reason not to. This way your code stays DRY and robust against changes:

class PhotoListAPIView(generics.ListCreateAPIView):
...
def perform_create(self, serializer):
serializer.validated_data['user'] = self.request.user
return super(PhotoListAPIView, self).perform_create(serializer)

It depends on your use case. If you want it to be "write-only", meaning DRF automatically populates the field on write and doesn't return the User on read, the most straight-forward implementation according to the docs would be with a HiddenField:

class PhotoListAPIView(generics.ListCreateAPIView):
user = serializers.HiddenField(
default=serializers.CurrentUserDefault(),
)

If you want want it to be readable, you could use a PrimaryKeyRelatedField while being careful that your serializer pre-populates the field on write - otherwise a user could set the user field pointing to some other random User.

class PhotoListAPIView(generics.ListCreateAPIView):
user = serializers.PrimaryKeyRelatedField(
# set it to read_only as we're handling the writing part ourselves
read_only=True,
)


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

Finally, note that if you're using the more verbose APIView instead of generics.ListCreateAPIView, you have to overwrite create instead of perform_create like so:

class PhotoListAPIView(generics.ListCreateAPIView):
user = serializers.PrimaryKeyRelatedField(
read_only=True,
)


def create(self, validated_data):
# add the current User to the validated_data dict and call
# the super method which basically only creates a model
# instance with that data
validated_data['user'] = self.request.user
return super(PhotoListAPIView, self).create(validated_data)

Try this:

def post(self, request, format=None)


serializer = ProjectSerializer(data=request.data)
request.data['user'] = request.user.id




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

You can avoid passing the user in your request and you won't see it in the output but DRF will populate it automatically:

from rest_framework import serializers


class MyModelSerializer(serializers.ModelSerializer):
user = serializers.HiddenField(default=serializers.CurrentUserDefault())


class Meta:
model = models.MyModel
fields = (
'user',
'other',
'fields',
)

This is what works for me in serializers.py, where I am also using nested data. I want to display created_by_username without having to lookup other users.

class ListSerializer(serializers.ModelSerializer):
"""
A list may be created with items
"""
items = ItemSerializer(many=True)


# automatically set created_by_id as the current user's id
created_by_id = serializers.PrimaryKeyRelatedField(
read_only=True,
)


created_by_username = serializers.PrimaryKeyRelatedField(
read_only=True
)




class Meta:
model = List
fields = ('id', 'name', 'description', 'is_public',
'slug', 'created_by_id', 'created_by_username', 'created_at',
'modified_by', 'modified_at', 'items')


def create(self, validated_data):
items_data = validated_data.pop('items', None)
validated_data['created_by_id'] = self.context['request'].user
validated_data['created_by_username'] = self.context['request'].user.username
newlist = List.objects.create(**validated_data)


for item_data in items_data:
Item.objects.create(list=newlist, **item_data)
return newlist

As of DRF version 3.8.0 (Pull Request discussion), you can override save() in serializer.

from rest_framework import serializers
...


class PostSerializer(serializers.ModelSerializer):
user = serializers.PrimaryKeyRelatedField(read_only=True, default=serializers.CurrentUserDefault())


class Meta:
model = Post
fields = ['id', 'user', 'photo']


def save(self, **kwargs):
"""Include default for read_only `user` field"""
kwargs["user"] = self.fields["user"].get_default()
return super().save(**kwargs)

I wrote an extension to DRF's serializer below

from rest_framework import serializers


class AuditorBaseSerializer(serializers.Serializer):
created_by = serializers.StringRelatedField(default=serializers.CurrentUserDefault(), read_only=True)
updated_by = serializers.StringRelatedField(default=serializers.CurrentUserDefault(), read_only=True)


def save(self, **kwargs):
# if creating record.
if self.instance is None:
kwargs["created_by"] = self.fields["created_by"].get_default()


kwargs["updated_by"] = self.fields["updated_by"].get_default()
return super().save(**kwargs)

and it can be used as follows

class YourSerializer(serializers.ModelSerializer, AuditorBaseSerializer):
class Meta:
model = SelfEmployedBusiness
fields = (
'created_by',
'updated_by',
)