python - Django 表单自定义 : change field on other field change

Question

我只是 Django 的新手几天。现在，当自定义表单中其他字段的值发生变化时，我需要同时更改一个字段中的值和表示形式。此时更改 MyModel 是受限。

我的应用程序/models.py:

class MyModel(models.Model):
    somefield = models.IntegerField(default=0)

我的应用程序/forms.py

class MyModelForm(models.Model):
    someformfield = models.BooleanField(required=False)
    // Here it should be smth as following:
    // def clean(..), or def save(..), or def __init__(..)
    if MyModelForm.is_valid():
        # This if-else construction further should 'raise' on every change of 'someformfield'-checkbox:
        if someformfield == True:
            somefield = 0
            self.fields['somefield'].widget = forms.HiddenInput()
        else:
            somefield = data['somefield'] # Just to use User Input
            self.fields['somefield'].widget = forms.ShownInput() # What's wrong, but I just need to abort HiddenInput somehow - so, how shoulda do it?

我尝试像下面这样定义 clean()，但它什么也没做，甚至没有引发 forms.ValidationError:

def clean(MyModelForm, self):
    cleaned_data = super(MyModelForm, self).clean()

    if self.cleaned_data['someformfield']:
        if self.cleaned_data['somefield'] != 0:
            # This didn't work
            raise forms.ValidationError(
                "Error!"
            )
            # And following also didn't work
            self.cleaned_data['somefield'] = 0
            self.fields['somefield'].widget = forms.HiddenInput()

这也行不通:

def clean(MyModelForm, self):
    cleaned_data = super(MyModelForm, self).clean()
    somefield = cleaned_data.get("somefield")
    someformfield = cleaned_data.get("someformfield")

        if someformfield:
            # Also not working
            if somefield != 0:
                raise forms.ValidationError(
                    "Error!"
                )
            # Also not working
            somefield = 0
            self.fields['somefield'].widget = forms.HiddenInput()

可能，我应该使用一些其他方法 - save(..) 或 init(..)，或其他什么，但在文档中完全混淆并且不知道，目的是什么这些方法中的每一个。那么我应该在这里使用哪种方法以及如何使用？

Answer 1

clean 方法应该只接受一个参数，即 self。

class MyModelForm(models.Model):
    someformfield = models.BooleanField(required=False)

    def clean(self):
        cleaned_data = self.cleaned_data
        # do the work you want ...