Django - 管理/添加运行 model.clean 即使字段丢失
好的，我有一个这样的模型：
class Airplane(models.Model):
tail = models.ForeignKey(Tails)
wheel = models.CharField(max_length=500,blank=True)
window = models.CharField(max_length=500,blank=True)
def clean(self):
if self.tail and self.wheel and self.window:
raise ValidationError("Can't have all three, choose tail and one more")
现在，如果我使用 Django admin 添加新的飞机记录。如果我将两个字段留空并保存，我会收到此 Django 错误，指向 if self.tail and self.wheel 行。
DoesNotExist at /admin/MyProject/airplane/add/
Request Method: POST
Request URL: http://44.101.44.172:8001/admin/MyProject/airplane/add/
Django Version: 1.2.5
Exception Type: DoesNotExist
Exception Value:
Exception Location: /usr/lib/python2.7/site-packages/django/db/models/fields/related.py in __get__, line 299
Python Executable: /usr/bin/python
Python Version: 2.7.0
Django 不应该在运行 clean 之前检查必填字段是否已填写吗？无论如何，处理这个问题的最佳方法是什么？
Ok, so I have a model like this:
class Airplane(models.Model):
tail = models.ForeignKey(Tails)
wheel = models.CharField(max_length=500,blank=True)
window = models.CharField(max_length=500,blank=True)
def clean(self):
if self.tail and self.wheel and self.window:
raise ValidationError("Can't have all three, choose tail and one more")
Now if I go to add a new Airplane record using Django admin. If I leave both fields blank and save I get this Django error pointing to the line if self.tail and self.wheel.
DoesNotExist at /admin/MyProject/airplane/add/
Request Method: POST
Request URL: http://44.101.44.172:8001/admin/MyProject/airplane/add/
Django Version: 1.2.5
Exception Type: DoesNotExist
Exception Value:
Exception Location: /usr/lib/python2.7/site-packages/django/db/models/fields/related.py in __get__, line 299
Python Executable: /usr/bin/python
Python Version: 2.7.0
Shouldn't Django be checking that the required fields are filled in before running clean? In any case, what's the best way to handle this issue?
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评论（2）
您的 tails 字段不接受空值。您需要添加
null=True才能使其正常工作。Your tails field does not accept null values. You will need to add
null=Trueto it to make it work.好的，作为一种解决方法，我最终定义了 自定义表单 与 我的验证 在该模型的 admin.py 中。
我仍然不明白为什么在 Django 确定必填字段已填写之前 model.clean 被调用。哦，好吧。
Ok, as a workaround I ended up defining a custom form with my validation in admin.py for this model.
I still don't understand why model.clean gets called before Django has determined that the required fields have been filled in. Oh well.