python - Queryset.create() 方法中的 Django， 'self._for_write' 是什么？

Question

在下面这段代码中，代码self._for_write 是什么意思？意思？

def create(self, **kwargs):
    """
    Create 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

Answer 1

基于 django.db.models.query.QuerySet.db

@property
def db(self):
    """Return the database used if this query is executed now."""
    if self._for_write:
        return self._db or router.db_for_write(self.model, **self._hints)
    return self._db or router.db_for_read(self.model, **self._hints)

这意味着当您的 QuerySet有 self._for_write == True ，它将使用 db_for_write 触发您的查询.更多详情请阅读 Django document db_for_write