Question

class MyModel(models.Model) :
  people = models.ManyToManyField(User,related_name='people')
  ...

class MyForm(ModelForm) :
  class Meta :
     model = MyModel
     widgets = {'people':TextInput(),}
  def clean_people(self) :
     # turn a comma-separated list of names into a Python list
     return [name0,name1,...]
  def clean(self) :
     # if no other errors, turn list of names into list of Users

这不起作用，因为在调用field.clean之前不会调用clean_people，其中field是ModelMultipleChoiceField的一个实例，它检查Python列表或元组，因此引发ValidationError并跳过clean_people。是否存在调用顺序的原因，是否存在一些避免此问题的标准规定？我可以在MyForm的每个实例中将field.clean设置为lambda x：x，但这看起来真的很难看。将MyForm中的人员字段明确定义为CharField可能是正确的做法吗？

Answer 1

你为什么不override clean的行为？

class MyForm(ModelForm):
    class Meta:
        model = MyModel
        widgets = {'people':TextInput(),}

    def clean_people(self):
        # turn a comma-separated list of names into a Python list
        return [name0,name1,...]

    # override below!
    def clean(self):
        super(MyForm, self).clean()
        # do stuff you need, eg: call clean_people(self)
        return self.cleaned_data

我不确定我是否100％理解你的问题，但仅仅通过在clean（）之前定义clean_people（）并不意味着之前会调用它，甚至根本不需要调用它。

Answer 2

好像好吗？事情是在表单中定义人员字段，覆盖模型对该字段的想法

class MyModel(models.Model) :
  people = models.ManyToManyField(User,related_name='people')
  ...

class MyForm(ModelForm):
    people = CharField(...)

    class Meta :
       model = MyModel

    def clean_people(self) :
       # turn a comma-separated list of names into a Python list
       return [name0,name1,...]

    def clean(self) :
       # if no other errors, turn list of names into list of Users

如何让django ModelForm在为该字段运行clean_之前不清理ManyToManyField？

2 个答案: