"ValidatioError: Value ... is not a valid choice" in Django even with a valid choice-CodePudding

I have a model with a object_type field where the choices should be numbers and the human readable a string like below:

OBJECT_TYPES = (
    (0, "analog-input"),
    (1, "analog-output"),
    (2, "analog-value")
)

class MyModel(models.Model):
    object_type = models.CharField(
        max_length=20,
        choices=OBJECT_TYPES,
        blank=True,
        null=True
    )

However, when I try to create an object and assign an integer value to object_type I get a ValidationError that the object_type is not a valid choice and I can't understand how to configure it properly. I have tried with CharField, TextField and IntegerField.

obj = MyModel.objects.create(object_type=2)
obj.full_clean()

ValidationError: {'object_type': ["Value '2' is not a valid choice."]}

CodePudding user response：

Since this is a CharField, the keys should be strings, so '0', not 0:

OBJECT_TYPES = (
    ('0', "analog-input"),
    ('1', "analog-output"),
    ('2', "analog-value")
)

an alternative is to work with an IntegerField:

OBJECT_TYPES = (
    (0, "analog-input"),
    (1, "analog-output"),
    (2, "analog-value")
)

class MyModel(models.Model):
    object_type = models.IntegerField(
        choices=OBJECT_TYPES,
        blank=True,
        null=True
    )