python - django orm中objects.create()和object.save()的区别

Question

u = UserDetails.objects.create(first_name='jake',last_name='sullivan')
u.save()

UserDetails.objects.create() 和 u.save() 都执行相同的 save() 功能。有什么区别？使用 create() 与 save() 有什么额外的检查或好处吗？

类似问题:

• What's the best way to create a model object in Django?
• Django: Difference between save() and create() from transaction perspective
• Django Model() vs Model.objects.create()

Answer 1

The Django documentation says it is the same .把它放在一条线上只是更方便。您也可以在一行上创建一个 save()，但它会更冗长且可读性较差——很明显，您正在使用 create() 创建一个新对象> 方法。

create(**kwargs)

A convenience method for creating an object and saving it all in one step. Thus:

p = Person.objects.create(first_name="Bruce", last_name="Springsteen")

and:

p = Person(first_name="Bruce", last_name="Springsteen")
p.save(force_insert=True)

are equivalent.

The force_insert parameter is documented elsewhere, but all it means is that a new object will always be created. Normally you won’t need to worry about this. However, if your model contains a manual primary key value that you set and if that value already exists in the database, a call to create() will fail with an IntegrityError since primary keys must be unique. Be prepared to handle the exception if you are using manual primary keys.