如果模型表单排除了某些字段，当模型具有干净的方法时，如何处理模型表单的验证？

from django import forms
from .models import YourModel

# 方法一：使用Django的表单验证
class YourForm(forms.ModelForm):
    def clean(self):
        cleaned_data = super().clean()
        
        # 手动验证被排除的字段
        excluded_field_data = self.cleaned_data.get('excluded_field')
        if not excluded_field_data:
            raise forms.ValidationError("Excluded field is required.")

        return cleaned_data

# 方法二：使用Django的模型表单验证
class YourModelForm(forms.ModelForm):
    def clean(self):
        cleaned_data = super().clean()

        # 手动验证被排除的字段
        excluded_field_data = self.cleaned_data.get('excluded_field')
        if not excluded_field_data:
            raise forms.ValidationError("Excluded field is required.")

        return cleaned_data

    class Meta:
        model = YourModel
        exclude = ['excluded_field']

# 方法三：使用Django的ModelForm和exclude参数
class YourModelForm(forms.ModelForm):
    class Meta:
        model = YourModel
        exclude = ['excluded_field']