Additional Serializer Fields in Django REST Framework 3

Question

Situation

I am creating a simple endpoint that allows for the creation of a user. I need a field that is not in my user model (i.e., confirm_p

Answer 1

Also useful for nested serializer implementation representing models, when the root model doesn't have directly access to fields you want to use. Thank you @vyscond ;) Fyi here is my case:

models.py

class Company(models.Model):
    permission_classes = (
        IsCompanyMember,
    )

    name = models.CharField(
        unique=True,
        max_length=100,
        verbose_name='company name',
        null=False
    )
class Profile(models.Model):

    company = models.ForeignKey(Company, on_delete=models.CASCADE, null=True)
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    is_company_admin = models.BooleanField(default=False, null=False)
    is_email_validated = models.BooleanField(default=False, null=False)
    is_approved_by_company_admin = models.BooleanField(default=False, null=False)

serializer.py

class CompanySerializer(serializers.ModelSerializer):
    class Meta:
        model = Company
        fields = ('name',)

class CustomUserRegistrationSerializer(serializers.ModelSerializer):
    password = serializers.CharField(style={'input_type': 'password'},
                                 write_only=True,
                                 validators=settings.get('PASSWORD_VALIDATORS'))

    company = CompanySerializer(allow_null=False, required=True,write_only=True)

    class Meta:
        model = User
        fields = ('username',
                  'email',
                  'password',
                  'company',
                  'first_name',
                  'last_name')