[英]why is the UserCreationForm has UserName field explicity defined in model class in Django?
我在django.contrib.auth.forms
查看UserCreationForm
source code
我注意到的是以下内容:
class Meta:
model = User
fields = ("username",)
为什么需要在fields
明确提及此(“用户名”)。因为有一个username
UserCreationForm
段再次定义UserCreationForm
。 为什么? 为什么Password fields
不包含在上面的Meta class
定义中?
class UserCreationForm(forms.ModelForm):
"""
A form that creates a user, with no privileges, from the given username and
password.
"""
error_messages = {
'duplicate_username': _("A user with that username already exists."),
'password_mismatch': _("The two password fields didn't match."),
}
username = forms.RegexField(label=_("Username"), max_length=30,
regex=r'^[\w.@+-]+$',
help_text=_("Required. 30 characters or fewer. Letters, digits and "
"@/./+/-/_ only."),
error_messages={
'invalid': _("This value may contain only letters, numbers and "
"@/./+/-/_ characters.")})
password1 = forms.CharField(label=_("Password"),
widget=forms.PasswordInput)
password2 = forms.CharField(label=_("Password confirmation"),
widget=forms.PasswordInput,
help_text=_("Enter the same password as above, for verification."))
class Meta:
model = User
fields = ("username",)
def clean_username(self):
# Since User.username is unique, this check is redundant,
# but it sets a nicer error message than the ORM. See #13147.
username = self.cleaned_data["username"]
try:
User._default_manager.get(username=username)
except User.DoesNotExist:
return username
raise forms.ValidationError(
self.error_messages['duplicate_username'],
code='duplicate_username',
)
def clean_password2(self):
password1 = self.cleaned_data.get("password1")
password2 = self.cleaned_data.get("password2")
if password1 and password2 and password1 != password2:
raise forms.ValidationError(
self.error_messages['password_mismatch'],
code='password_mismatch',
)
return password2
def save(self, commit=True):
user = super(UserCreationForm, self).save(commit=False)
user.set_password(self.cleaned_data["password1"])
if commit:
user.save()
return user
fields
属性存在,因为没有它,该模型中的所有字段都将显示在表单上(ModelForm的默认行为是在没有“fields”或“exclude”属性的情况下显示模型中的所有字段) 。
password
字段不在其中,因为表单上显示的密码字段实际上不是存储在模型中的密码字段 - 模型中的密码字段是散列密码,而表单上显示的密码字段是普通文本字段。 因此,处理此表单的代码会获取这些文本密码,确保它们是相同的,然后创建“真实”密码并将其存储在模型中。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.