DRF IntegrityError: NOT NULL constraint failed: user_id - django

Question

I can't figure out how to pass user object to the following serializer:
class ReviewSerializer(serializers.ModelSerializer):
user = UserSerializer(read_only=True)
class Meta:
model = Review
fields = ('pk', 'title', 'user', 'movie', 'timestamp', 'review_text',)
I have this viewset:
class ReviewsViewSet(viewsets.ModelViewSet):
queryset = Review.objects.all()
serializer_class = ReviewSerializer
and this model:
class Review(models.Model):
title = models.CharField(max_length=255)
user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='reviews')
movie = models.ForeignKey(Movie, on_delete=models.CASCADE, related_name='reviews')
review_text = models.TextField()
timestamp = models.DateTimeField(auto_now_add=True)
def __str__(self):
return '{movie} review by {user}'.format(user=self.user, movie=self.movie)
My javascript request looks like this:
return axios({
method: 'post',
url: 'http://localhost:8000/api/reviews/',
data: { // Using data from Vue
title: this.review_title,
movie: this.id,
review_text: this.review_text,
user: JSON.stringify(this.user)
},
headers: {
'Content-Type': 'application/json',
Authorization: `JWT ${token}`
}
})
It gives me this traceback.
How should I pass the user object to the request?
Thanks in advance.

Answer 1

Remove read_only=True from serializer
class ReviewSerializer(serializers.ModelSerializer):
user = UserSerializer()
class Meta:
model = Review
fields = ('pk', 'title', 'user', 'movie', 'timestamp', 'review_text',)
If you set read_only=True, the DRF will not takes the value from input source even if it's there
From the doc,
Read-only fields are included in the API output, but should not be
included in the input during create or update operations. Any
'read_only' fields that are incorrectly included in the serializer
input will be ignored.
Set this to True to ensure that the field is used when serializing a
representation, but is not used when creating or updating an instance
during deserialization.
Defaults to False
UPDATE
You should override the create() method of ReviewSerializer as
class ReviewSerializer(serializers.ModelSerializer):
user = UserSerializer()
def create(self, validated_data):
user_dict = validated_data.pop('user')
user_obj, created = User.objects.get_or_create(**user_dict)
return Review.objects.create(user=user_obj, **validated_data)
class Meta:
model = Review
fields = ('pk', 'title', 'user', 'movie', 'timestamp', 'review_text',)
for debug purpose only
class ReviewsViewSet(viewsets.ModelViewSet):
queryset = Review.objects.all()
serializer_class = ReviewSerializer
def create(self, request, *args, **kwargs):
print(request.data) # print here <<<<
return super(ReviewsViewSet, self).create(request, *args, **kwargs)