python 从 django 模型的保存方法中引发 ValidationError？
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Raising ValidationError from django model's save method?
提问by slypete
I need to raise an exception in a model's save method. I'm hoping that an exception exists that will be caught by any django ModelFormthat uses this model including the admin forms.
我需要在模型的保存方法中引发异常。我希望存在一个异常，该异常将被ModelForm使用此模型的任何 django 捕获，包括管理表单。
I tried raising django.forms.ValidationError, but this seems to be uncaught by the admin forms. The model makes a remote procedure call at save time, and it's not known until this call if the input is valid.
我尝试提高django.forms.ValidationError，但这似乎没有被管理表单捕获。该模型在保存时进行远程过程调用，直到此调用才知道输入是否有效。
Thanks, Pete
谢谢，皮特
采纳答案by Daniel Roseman
There's currently no way of performing validation in model save methods. This is however being developed, as a separate model-validation branch, and should be merged into trunk in the next few months.
目前无法在模型保存方法中执行验证。然而，这是作为一个单独的模型验证分支开发的，应该在接下来的几个月内合并到主干中。
In the meantime, you need to do the validation at the form level. It's quite simple to create a ModelFormsubclass with a clean()method which does your remote call and raises the exception accordingly, and use this both in the admin and as the basis for your other forms.
同时，您需要在表单级别进行验证。创建一个ModelForm带有clean()方法的子类非常简单，该方法执行您的远程调用并相应地引发异常，并在管理中使用它并作为其他表单的基础。
回答by Cerin
Since Django 1.2, this is what I've been doing:
从 Django 1.2 开始，这就是我一直在做的事情：
class MyModel(models.Model):
<...model fields...>
def clean(self, *args, **kwargs):
if <some constraint not met>:
raise ValidationError('You have not met a constraint!')
super(MyModel, self).clean(*args, **kwargs)
def full_clean(self, *args, **kwargs):
return self.clean(*args, **kwargs)
def save(self, *args, **kwargs):
self.full_clean()
super(MyModel, self).save(*args, **kwargs)
This has the benefit of working both inside and outside of admin.
这有利于在管理员内部和外部工作。
