[英]Django: Saving multiple ManyToMany fields within a transaction
this is the representation of my models: 这是我的模型的代表:
class B(models.Model):
"""I'm a dummy model, so doesn't pay atention of what I do"""
name = models.CharField(max_length=250)
class A(models.Model):
name = models.CharField(max_length=250)
many_b = models.ManyToManyField(B)
Now, suppose I have a list of B
objects. 现在,假设我有一个B
对象列表。 And a single A
object that will be related to that B
s. 还有一个与该B
相关的A
对象。 Something like this: 像这样的东西:
a = A.objects.get(id=1)
list_of_b = [B<name='B1'>,B<name='B2'>,B<name='B3'>,]
The way I relate them now is this: 我现在与他们联系的方式是这样的:
for b_object in list_of_b:
a.many_b.add(b_object)
Is there any way to add all the B objects in a single transaction? 有没有办法在单个事务中添加所有B对象? Maybe in a single method, like: 也许在一个方法中,例如:
a.many_b.addList(b) #This doesn't exist
From the docs : 来自文档 :
>>> john = Author.objects.create(name="John")
>>> paul = Author.objects.create(name="Paul")
>>> george = Author.objects.create(name="George")
>>> ringo = Author.objects.create(name="Ringo")
>>> entry.authors.add(john, paul, george, ringo)
So if you have a list, use argument expansion: 因此,如果您有一个列表,请使用参数扩展:
a.many_b.add(*list_of_b)
I guess what you want is a kind of bulk insert right? 我想你想要的是一种批量插入吗?
As far as I know this is just available in the Django TRUNK not in 1.3! 据我所知,这只是在Django TRUNK中不在1.3中!
check it out some tutorial: http://www.caktusgroup.com/blog/2011/09/20/bulk-inserts-django/ 查看一些教程: http : //www.caktusgroup.com/blog/2011/09/20/bulk-inserts-django/
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