如何构建 django-mptt 树而不在每次插入后重建？

发布于 2024-12-01 23:06:31 字数 379 浏览 9 评论 0原文

我正在构建大型 mptt 树。我想插入所有节点，然后启动重建整个树的方法：

for i in range(big_loop):
    ...
    m.save() # Saving mptt object. Tree is rebuild.
some_mptt_model.tree.rebuild()

如何避免每次插入后重建树？

我在 .save 方法中只发现了 depracted 关键字：

在早期版本中，MPTTModel.save() 有一个原始关键字参数。如果确实，MPTT 字段在保存期间不会更新。这（未记录的）参数现已被删除。

原文

I'm building large mptt tree.
I'd like to insert all nodes and after that start method for rebuilding whole tree:

for i in range(big_loop):
    ...
    m.save() # Saving mptt object. Tree is rebuild.
some_mptt_model.tree.rebuild()

How can I avoid rebuilding tree after each insert?

I've found only depracted keyword in .save method:

In earlier versions, MPTTModel.save() had a raw keyword argument. If
True, the MPTT fields would not be updated during the save. This
(undocumented) argument has now been removed.

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街角卖回忆 2024-12-08 23:06:31

您可以使用在每次插入后禁用重建树disable_mptt_updates 方法：

with MyModel.objects.disable_mptt_updates():
    # some bulk updates...
    for obj in objects:
        obj.save()

# And then you can rebuild the tree.
MyModel.objects.rebuild()

You can disable rebuilding tree after each insert using disable_mptt_updates method:

with MyModel.objects.disable_mptt_updates():
    # some bulk updates...
    for obj in objects:
        obj.save()

# And then you can rebuild the tree.
MyModel.objects.rebuild()

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心奴独伤 2024-12-08 23:06:31

也许可以借助代理模型。在代理模型中，可以重写 save 方法来调用 models.Model 的 save 方法，而不是 MPTT save 方法。像这样的事情：

class MyNonMPTTModel(MyMPTTModel):
    class Meta:
        proxy = True

    def save(self, *args, **kwargs):
        super(models.Model, self).save(*args, **kwargs)

我没有尝试这段代码，但我想它可以工作。

Maybe this can be solved with a help of Proxy models. In proxy model, save method could be overriden to call savemethod of models.Model instead of MPTT save method. Something like this:

class MyNonMPTTModel(MyMPTTModel):
    class Meta:
        proxy = True

    def save(self, *args, **kwargs):
        super(models.Model, self).save(*args, **kwargs)

I did not try this code, but I guess it could work.

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