如何在打开模型项编辑/更改页面时自动修改django模型对象的值？

# forms.py
from django import forms
from .models import YourModel

class YourModelForm(forms.ModelForm):
    class Meta:
        model = YourModel
        fields = '__all__'

    def __init__(self, *args, **kwargs):
        instance = kwargs.get('instance')
        if instance:
            initial = kwargs.get('initial', {})
            for field in self.Meta.fields:
                initial[field] = getattr(instance, field)
            kwargs['initial'] = initial
        super().__init__(*args, **kwargs)

# views.py
from django.shortcuts import render, get_object_or_404
from .forms import YourModelForm
from .models import YourModel

def edit_model(request, model_id):
    instance = get_object_or_404(YourModel, id=model_id)
    if request.method == 'POST':
        form = YourModelForm(request.POST, instance=instance)
        if form.is_valid():
            form.save()
            # 处理保存成功后的逻辑
    else:
        form = YourModelForm(instance=instance)
    return render(request, 'edit_model.html', {'form': form})

# edit_model.html
<form method="post">
  {% csrf_token %}
  {{ form.as_p }}
  <button type="submit">保存</button>
</form>