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from django import forms
from django.db.models import Field
# https://docs.djangoproject.com/en/5.0/howto/custom-model-fields/
class BitField(Field):
description = 'Bit string'
def __init__(self, *args, length=None, **kwargs):
self.length = length
super().__init__(*args, **kwargs)
def deconstruct(self):
name, path, args, kwargs = super().deconstruct()
if self.length is not None:
kwargs['length'] = self.length
return name, path, args, kwargs
def db_type(self, connection):
if self.length is None:
return 'bit'
return 'bit(%d)' % self.length
def formfield(self, **kwargs):
return super().formfield(form_class=BitFormField, **kwargs)
class BitFormField(forms.CharField):
def to_python(self, value):
if isinstance(value, str) and value == '':
return None
return super().to_python(value)
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