我们实现了LowerCaseCharField.我们很乐意听到更好的实施建议.
from django.db.models.fields import CharField
class LowerCaseCharField(CharField):
"""
Defines a charfield which automatically converts all inputs to
lowercase and saves.
"""
def pre_save(self, model_instance, add):
"""
Converts the string to lowercase before saving.
"""
current_value = getattr(model_instance, self.attname)
setattr(model_instance, self.attname, current_value.lower())
return getattr(model_instance, self.attname)
事实上我们喜欢的是:
> modelinstance.field_name="TEST"
> print modelinstance.field_name
'test'
当前实现仅在保存时转换为小写.
我创建了一个自定义 UserModel 并使用电子邮件作为主要的身份验证 ID 而不是用户名。
它区分大小写的问题，因为它将 test@gmail.com,Test@gmail.com 计为 2 个不同的帐户。
我需要强制它处理 1 个帐户，而忽略它是大写还是小写。
这是我的文件：
模型.py
class UserModelManager(BaseUserManager):
def create_user(self, email, password, pseudo):
user = self.model()
user.name = name
user.email = self.normalize_email(email=email)
user.set_password(password)
user.save()
return user
def create_superuser(self, email, password):
'''
Used for: python manage.py createsuperuser
'''
user = self.model()
user.name = 'admin-yeah'
user.email = self.normalize_email(email=email)
user.set_password(password)
user.is_staff = True
user.is_superuser = True
user.save()
return user
class UserModel(AbstractBaseUser, PermissionsMixin):
## Personnal fields.
email = models.EmailField(max_length=254, unique=True)
name = models.CharField(max_length=16)
## [...] …So, I've made a similar class to this answer. It looks like:
class TruncatingCharField(models.CharField):
description = _("String (truncated to %(max_length)s)")
def get_prep_value(self, value):
value = super(TruncatingCharField, self).get_prep_value(value)
if value:
value = value[:self.max_length]
return value
I would expect that instantiating a model with this field with strings longer than the threshold should trigger truncation. However this appears not to be the case:
class NewTruncatedField(models.Model):
trunc = TruncatingCharField(max_length=10)
class TestTruncation(TestCase):
def test_accepted_length(self):
trunc = 'a'*5
obj = NewTruncatedField(trunc=trunc)
self.assertEqual(len(obj.trunc), 5)
def …