Python django orm 中objects.create() 和object.save() 的区别
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difference between objects.create() and object.save() in django orm
提问by jacquel
u = UserDetails.objects.create(first_name='jake',last_name='sullivan')
u.save()
UserDetails.objects.create()and u.save()both perform the same save()function. What is the difference? Is there any extra check or benefit in using create()vs save()?
UserDetails.objects.create()并且u.save()两者都执行相同的save()功能。有什么不同？使用create()vs有什么额外的检查或好处save()吗？
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类似的问题：
-在 Django 中创建模型对象的最佳方法是什么？
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采纳答案by Maxime Lorant
The Django documentation says it is the same. It is just more convenientto make it on one line. You could make a save()on one line too, but it would be more verbose and less readable -- it is clear you are creating a new object with the create()method.
Django 文档说它是一样的。这仅仅是更方便，使其在同一行。您也可以save()在一行上创建一个，但它会更冗长且可读性更低——很明显，您正在使用该create()方法创建一个新对象。
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_insertparameter 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 tocreate()will fail with anIntegrityErrorsince primary keys must be unique. Be prepared to handle the exception if you are using manual primary keys.
create(**kwargs)一种创建对象并将其全部保存在一个步骤中的便捷方法。因此：
p = Person.objects.create(first_name="Bruce", last_name="Springsteen")和：
p = Person(first_name="Bruce", last_name="Springsteen") p.save(force_insert=True)是等价的。
该
force_insert参数在别处有文档记录，但它意味着总是会创建一个新对象。通常你不需要担心这个。但是，如果您的模型包含您设置的手动主键值，并且该值已存在于数据库中，则调用create()将失败，IntegrityError因为主键必须是唯一的。如果您使用手动主键，请准备好处理异常。
