在mongoengine中对ListField进行排序 [英] sorting a ListField in mongoengine

问题描述

我在mongoengine中有一个定义如下的模型:

I have a model in mongoengine defined like this:

class Task(Document):

    name = StringField(required=True, unique=True)
    frequency = IntField(required=True)
    quantity = IntField()
    units = StringField()
    events = ListField(DateTimeField(default=datetime.datetime.now))

如何获取最新的event?我尝试了以下方法但没有成功:

How can I get the latest event? I've tried the following to no success:

def latest(self):
    return self.events.sort()[-1]

而不是返回已排序的events的events，而是返回None

Instead of returning the events sorted sort returns None

推荐答案

您可以只使用Mongoengine SortedListField代替ListField，

You could just use the Mongoengine SortedListField instead of ListField, here is the doc

然后，如果您愿意的话，也可以简单地return self.events或反面

Then you could simply return self.events or its reverse if you wish as well

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