[英]Aggregation in flask-mongoengine
I'm just staring out with MongoDB and I'm staring an application with flask-mongoengine and I want to aggregate a few documents. 我只是盯着MongoDB,我正在用瓶子 - mongoengine盯着一个应用程序,我想汇总一些文件。
I'm using flask-mongoengine and when trying 我正在尝试使用烧瓶 - mongoengine
class MyDocumentModel(db.Document):
name = db.StringField(max_length=55)
MyDocumentModel.objects.aggregate()
I get the error: 我收到错误:
AttributeError: 'BaseQuerySet' object has no attribute 'aggregate'
AttributeError:'BaseQuerySet'对象没有属性'aggregate'
Starting with mongoengine v0.9 (which is currently in development), you will be able to use aggregate()
, like you suggested: http://docs.mongoengine.org/apireference.html#mongoengine.queryset.QuerySet.aggregate 从mongoengine v0.9开始(目前正在开发中),你可以像你建议的那样使用
aggregate()
: http : //docs.mongoengine.org/apireference.html#mongoengine.queryset.QuerySet.aggregate
Until then, you need to rely on pymongo
: Flask-MongoEngine & PyMongo Aggregation Query 在此之前,你需要依赖
pymongo
: Flask-MongoEngine和PyMongo聚合查询
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