"This field is required." in DRF serializers - django

Question

I am facing an issue in DRF serializers. I have a model named Issue which has a foreign Key of User Model to save the user who has created the particular Issue. Now the Get request is working fine when I request to get the issues I get it perfectly fine with username who has created the issue, but when I do the post request I get the error on "created_by" field that "This field is requied" even though I am providing this field.
Following is my code:
Model
class Issues(models.Model):
created_by = models.ForeignKey(User, on_delete=models.CASCADE, related_name='issue_created_by')
title = models.CharField(max_length=225, default='', null=False)
details = models.CharField(max_length=1000, default='')
created_on = models.DateField(default=timezone.now)
tags = models.CharField(max_length=225, blank=True, null=True, default='')
Issue Serializer
class IssueSerializer(serializers.ModelSerializer):
created_by = UserSerializer()
class Meta:
model = Issues
fields = ['created_by', 'title', 'details', 'created_on', 'tags']
UserSerializer
class UserSerializer(serializers.ModelSerializer):
class Meta:
model = User
fields = ['username', 'first_name', 'last_name', 'email', 'password']
extra_kwargs = {'password': {'write_only': True}}
def create(self, validated_data):
user = super().create(validated_data)
user.set_password(validated_data['password'])
user.save()
return True
views.py
class IssueView(viewsets.ViewSet):
def create(self, request):
serialized_issues = IssueSerializer(data=request.data)
if serialized_issues.is_valid():
serialized_issues.save()
return Response({'message': 'Issue Created', 'status': status.HTTP_200_OK})
else:
return Response({'error': serialized_issues.errors, 'status': status.HTTP_400_BAD_REQUEST})
def list(self, request):
all_issues = Issues.objects.all()
serialized_issues = IssueSerializer(all_issues, many=True)
return Response(serialized_issues.data)

Answer 1

To work with a writeable nested serializer you need to overwrite the create method of the serializer. You can see the documentation [here]: https://www.django-rest-framework.org/api-guide/relations/#writable-nested-serializers
It seems you are creating a new user with every Issue created. It is quite unrealistic. You need to pass the request.user object to the serializer while creating a new issue. The updated code may be like
method in view
def create(self, request, *args, **kwargs):
created_by = request.user
serializer = self.serializer_class(data=request.data)
if serializer.is_valid():
serializer.save(created_by=created_by)
return Response(data=serializer.data, status=status.HTTP_201_CREATED)
else:
return Response(data=serializer.errors, status=status.HTTP_400_BAD_REQUEST)```
and serializer file may be like
class IssueSerializer(serializers.ModelSerializer):
class Meta:
model = Issues
fields = ['title', 'details', 'created_on', 'tags']