How to use Primary Key In a Serializer in Django

Question

My Model is

class UserInfo(models.Model):
    user = models.OneToOneField(User, unique=True)
    mobile_no = models.CharField(max_length=10, blank=True)

and serialzer is :

class UserInfoSerializer(serializers.ModelSerializer):
    class Meta:
        model = UserInfo
        fields = ('mobile_no','user')

but whenever I tried to use this

serializer = UserInfoSerializer(data=data)
if serializer.is_valid():
   serializer.save()

It is not saving the data and giving errors.

Is there any method to use other then this to for using Primary key.

Answer 1

You should use PrimaryKeyRelatedField

add this to your serializer

user = serializers.PrimaryKeyRelatedField(queryset=User.objects.all())

Your UserInfoSerializer should look like:

class UserInfoSerializer(serializers.ModelSerializer):
    user = serializers.PrimaryKeyRelatedField(queryset=User.objects.all())

    class Meta:
        model = UserInfo
        fields = ('mobile_no','user')

Update If you want to update existing object in database then you have to pass model instance as an argument to UserInfoSerializer constructor.

user_info = self.get_object()
serializer = UserInfoSerializer(user_info, data=data)