django model Charfield

Question

If I want a CharField with only one digit is this the way to write the model

variable = model.CharField(max_length=1)

Or if you only have one Char it is a differnet field?

Thanks!

Answer 1

If there is only one digit (integer) being used,

You can take a look at:
PositiveSmallIntegerField or SmallIntegerField

Answer 2

variable = model.CharField(max_length=1)

This is perfectly fine. But as @Ilian Iliev noted it might be a good idea to tighten it up with choices

CHOICES = (('1', '1'), ..., ('10', '10')) # Simplified; you may want to add more, auto generate this list etc.
variable = model.CharField(max_length=1, choices=CHOICES)

You can also switch to an Integer field

CHOICES = ((1, '1'), ..., (10, '10')) 
variable = model.PositiveIntegerField(choices=CHOICES)

Answer 3

If you want to avoid the hideous drop-down selection widget that gets generated for choice fields, you can do this.

Model:

variable = model.CharField(max_length=1)

Form:

def clean_variable(self):
    data = self.cleaned_data['variable']
    if data not in string.digits:
        raise forms.ValidationError("Not a digit")
    return data

Answer 4

Use IntegerField and the clean method that S.Lott show to check is value between 0 and 10