Django:从Form中获取Model实例而不保存

Question

假设我有一个django ModelForm,我想在保存前编辑它.

例如,

而不是这个

model_instance = form.save()

我想做这样的事情

model_instance = form.get_model()
model_instance.edit() #say add a new field which is not available on form
model_instance.save()

Answer 1

model_instance = form.save(commit=False)

将返回模型的对象而不保存到DB

然后,您可以添加某些字段的值,这些字段在表单上不可用

model_instance.some_field = value
model_instance.save()

Answer 2

也：

model_instance = form.instance
# edit
model_instance.save()