DjangoModelForm:如何在发送到视图之前添加额外的字段并对其进行预处理

from django import forms
from django.forms import ModelForm
from .models import YourModel

class YourModelForm(ModelForm):
    extra_field = forms.CharField(label='额外字段', max_length=100)

    def __init__(self, *args, **kwargs):
        super(YourModelForm, self).__init__(*args, **kwargs)
        self.fields['extra_field'].initial = '初始值'

    def clean(self):
        cleaned_data = super(YourModelForm, self).clean()
        extra_field_value = cleaned_data.get('extra_field')
        # 在这里对额外字段进行预处理或验证
        # ...

        return cleaned_data

    class Meta:
        model = YourModel
        fields = '__all__'