1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
|
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)
|