如何在猫鼬中查询嵌套数组

Question

我有这样的架构

'use strict';

var mongoose = require('mongoose');
var Schema = mongoose.Schema;

var TeacherSchema = new Schema({
    education: [{degree: String, instituteName: String}],
    dob: Date,
    photoUrl: String,
    phoneNumber: String,
    institutes: [{type: mongoose.Schema.ObjectId, ref: 'Institute'}],
    subjects: [{
        name: String,
        topics: [{
            name: String,
            modules: [{
                name: String,
                classes: [{
                    name: String,
                    startTime: Date,
                    endTime: Date,
                    fee: Number
                }]
            }]
        }]
    }],
    created: {type: Date, default: Date.now}
})

module.exports = mongoose.model('Teacher', TeacherSchema);

我的问题是如何在嵌套数组中查询？具体来说，假设我想找到所有至少有一个主题/主题/模块/课程名称以“数学”开头的老师。我怎么能用猫鼬做到这一点？

Answer 1

看看这是否有效...

db.Teacher.find({$or:
[{'subjects':{"$elemMatch":{'name':'Math'}}},
{'subjects.topics':{"$elemMatch":{'name':'Math'}}},
{'subjects.topics.modules.classes':{"$elemMatch":{'name':'Math'}}}]
})

但是，我很想知道为什么模块数组只包含一个类数组时需要它？

假设您要使用通配符“ath”进行搜索

db.stack30173606.find({$or: [
{'subjects':{"$elemMatch":{'name':'Math'}}}, 
{'subjects.topics':{"$elemMatch":{'name':'math'}}}, 
{'subjects.topics.modules':{"$elemMatch":{'name':'Math'}}}, 
{'subjects.topics.modules.classes.name':{"$in":[/math/]}}
] })

如果不区分大小写，请检查：How do I make case-insensitive queries on Mongodb?