相关疑难解决方法(0)

MongoDB noob在这里......

好的,我有一个学生集合,每个都有一个如下所示的记录....我想按照降序排序'类型':'家庭作业'分数.

那个咒语在mongo shell上是什么样的？

> db.students.find({'_id': 1}).pretty()
{
        "_id" : 1,
        "name" : "Aurelia Menendez",
        "scores" : [
                {
                        "type" : "exam",
                        "score" : 60.06045071030959
                },
                {
                        "type" : "quiz",
                        "score" : 52.79790691903873
                },
                {
                        "type" : "homework",
                        "score" : 71.76133439165544
                },
                {
                        "type" : "homework",
                        "score" : 34.85718117893772
                }
        ]
}

我正在尝试这个咒语....

 doc = db.students.find()

 for (_id,score) in doc.scores:
     print _id,score

但它不起作用.