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我想使用 django-filetransfer 在管理员中上传一个文件，到目前为止，我已经覆盖了 admin.ModelAdmin 中的 render_change_form 方法。我错过了什么？

def render_change_form(self, request, context, add=False, change=False, form_url='', obj=None):
    upload_url,upload_data = prepare_upload(request, request.path)
    context['upload_url'] = upload_url
    context['upload_data'] = upload_data

    return admin.ModelAdmin.render_change_form(self, request, context, 
        add=add, change=change, form_url=upload_url, obj=obj)
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