Django 获取一个随机对象 [英] Django get a random object

问题描述

我正在尝试从模型 A 中获取一个随机对象

I am trying to get a random object from a model A

目前，它与此代码运行良好:

For now, it is working well with this code:

random_idx = random.randint(0, A.objects.count() - 1)
random_object = A.objects.all()[random_idx]

但我觉得这段代码更好:

But I feel this code is better:

random_object = A.objects.order_by('?')[0]

哪个最好?使用第一个代码删除对象的可能问题?因为，例如，我可以有 10 个对象，但 id 为 10 的对象不再存在?我是否误解了 A.objects.all()[random_idx] 中的某些内容?

Which one is the best? Possible problem with deleted objects using the first code? Because, for example, I can have 10 objects but the object with the number 10 as id, is not existing anymore? Did I have misunderstood something in A.objects.all()[random_idx] ?

推荐答案

刚刚在看这个.行:

random_object = A.objects.order_by('?')[0]

据报道已经关闭了许多服务器.

has reportedly brought down many servers.

不幸的是，Erwans 代码导致访问非顺序 ID 时出错.

Unfortunately Erwans code caused an error on accessing non-sequential ids.

还有一种简单的方法可以做到这一点:

There is another short way to do this:

import random

items = Product.objects.all()

# change 3 to how many random items you want
random_items = random.sample(items, 3)
# if you want only a single random item
random_item = random.choice(items)

这样做的好处是它可以毫无错误地处理非顺序 ID.

The good thing about this is that it handles non-sequential ids without error.

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