make length in integerfield django model

Question

my model.py is :

from django.core.validators import MinLengthValidator,MaxLengthValidator

    class clients(models.Model):
        client_identity_id = models.IntegerField(validators=[MaxLengthValidator(11),MinLengthValidator(11)], unique=True)

        '
        '

my serializers.py is :

class UserSerializer(serializers.ModelSerializer):
    #money = serializers.IntegerField(required=False)
    class Meta:
        model = clients
        fields = ('client_identity_id','client_id','client_firstname','client_middlename','client_lastname','client_country','money','client_num')
        read_only_fields = ('money','client_id')
    def create(self, validated_data, **kwargs):
        validated_data['client_id'] = ''.join(secrets.choice(string.ascii_uppercase + string.digits) 
                                              for i in range(8))

        return clients.objects.create(**validated_data)

my views.py is :

def post(self,request):
    data=request.data
    serializer = UserSerializer(data=data)
    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)

but when i make a post request with client_identity_id=12345678910 it keep telling me "object of type 'int' has no len()" how can i fix that please ?

willeM_ Van Onsem · Accepted Answer · 2020-04-29 19:47:54Z

1

A digit with 11 digits ranges between 10000000000 and 99999999999, so you can work with:

from django.core.validators import MinValueValidator, MaxValueValidator

class clients(models.Model):
        client_identity_id = models.IntegerField(
            validators=[
                MinValueValidator(10_000_000_000),
                MaxValueValidator(99_999_999_999)
            ],
            unique=True
        )

edited Apr 29, 2020 at 19:47

answered Apr 29, 2020 at 19:33

willeM_ Van Onsem

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1 Comment

Ahmad Mardene Over a year ago

it is MinValueValidator,MaxLengthValidator not MinValidator, MaxValidator , i tried it and the same error "object of type 'int' has no len()"

wgarlock · Accepted Answer · 2020-04-29 19:42:40Z

0

The error you’re receiving is a python error. Integers are not iterable objects in python. I assume your validators rely on the len() method which only works on iterable objects (strings, lists, etc.) I recommend you change your field to a CharField() or create a custom validator to check the scientific notation value of your integer. Example. An 11 character like 10000000000 would be 1 x 10^11. Hint the exponent is 11 here. I hope this helps!

answered Apr 29, 2020 at 19:42

wgarlock

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4 Comments

Ahmad Mardene Over a year ago

i made it charfield and it worked thanks! , any ideas how i can make it start with specific number like "01" ?

wgarlock Over a year ago

Google around for “prepend python string” there’s a ton of ways you could do this. If you wanted to add 01 to every single client_identity_id turning a 11 char entry to a 13 char entry, over write the def save() method. Before you call super(...).save() prepend “01” to self.client_identity_field. Here’s a link to overriding save stackoverflow.com/questions/4269605/…

Ahmad Mardene Over a year ago

no i dont mean that ,, i want the model only accept client_identity_id which start with "01"

wgarlock Over a year ago

I would probably write a custom validator in the save method. docs.djangoproject.com/en/3.0/ref/validators. Since strings are iterable, you could validate on client_identity_key[0:1] == “01”

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