Django model manager objects.create文档在哪里？

Question

我总是读到我应该用

model = Model(a=5, b=6)
model.save()

但我刚刚看到一个manager函数create，因为我看到一个opensource django应用程序正在使用它。

model = Model.objects.create(a=5, b=6)
print model.pk
1

所以建议使用它吗？还是仍然首选使用.save方法。我猜objects.create无论如何都会尝试创建它，而如果指定了pk，save可能会保存现有的对象。

这些是我找到的文件：https://docs.djangoproject.com/en/dev/topics/db/queries/#creating-objects

Answer 1

create基本上也是这样。下面是create的源代码。

def create(self, **kwargs):
    """
    Creates a new object with the given kwargs, saving it to the database
    and returning the created object.
    """
    obj = self.model(**kwargs)
    self._for_write = True
    obj.save(force_insert=True, using=self.db)
    return obj

它创建一个实例，然后保存它。

Answer 2

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

相当于：

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

The force_insert means 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.

Answer 3

它在页面"QuerySet API reference"中，从文档索引链接而来。