文档中的Mongoengine creation_time属性

问题描述

我正在尝试在文档中添加creation_time属性.以下是一个示例:

I am trying to add a creation_time attribute to my documents. The following would be an example:

import datetime

class MyModel(mongoengine.Document):
    creation_date = mongo.DateTimeField()
    modified_date = mongo.DateTimeField(default=datetime.datetime.now)

Django模型为其DateTimeField对象(例如add_now等)内置参数，但是MongoEngine不支持此功能.

Django models have built in parameter for their DateTimeField objects like add_now, etc.,but MongoEngine does not support this.

我想知道做到这一点的最佳方法是:

I am wondering if best way to do this is the following:

m,created = MyModel.objects.get_or_create()
if created:
    m.creation_date = datetime.datetime.now()

或者有更好更好的方法.

or if there is a better, nicer way.

推荐答案

您可以覆盖save方法.

You could override the save method.

class MyModel(mongoengine.Document):
    creation_date = mongo.DateTimeField()
    modified_date = mongo.DateTimeField(default=datetime.datetime.now)

    def save(self, *args, **kwargs):
        if not self.creation_date:
            self.creation_date = datetime.datetime.now()
        self.modified_date = datetime.datetime.now()
        return super(MyModel, self).save(*args, **kwargs)

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