class A:
min_v = 1
max_v = 15
number1 = IntegerField(min_value=min_v, max_value=max_v)
class B(A):
number2 = IntegerField(min_value=A.min_v, max_value=A.max_v)
class C(B):
min_v = 2
max_v = 20
How to make both number1 and number2 to be in range from 2 to 20 in class C?
I'm thinking about two ways:
__init__ redeclare self.fields['number1'] like IntegerField(min_value=self.min_v)self.fields['number1'].min_value=self.min_v in __init__ and override setattr() to add validator.What is the best and the cleanest way?
It might be better to add these bounds as validators to the the bounds in the __init__ method of class A and class B. This will make these transparent to C and furthermore C can for example define another IntegerField for that name and thus specify a different widget for that:
from django.core import validators
class A:
number1 = IntegerField()
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
number1 = self.fields['number1']
number1.validators.append(validators.MinValueValidator(self.min_v))
number1.validators.append(validators.MaxValueValidator(self.max_v))
number1.widget.attrs['min'] = number1.min_value = self.min_v
number1.widget.attrs['max'] = number1.max_value = self.max_v
class B(A):
number2 = IntegerField()
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
number2 = self.field['number2']
number2.validators.append(validators.MinValueValidator(self.min_v))
number2.validators.append(validators.MaxValueValidator(self.max_v))
number2.widget.attrs['min'] = number2.min_value = self.min_v
number1.widget.attrs['max'] = number2.max_value = self.max_v