按数组内的对象字段查找文档

Question

我需要一个Show Schema，我想在节目中只获得可用的门票。我需要找到所有可用的文件＆gt; 0并只使用show._id和show.title获取此子文档。我怎么能这样做？

// Show's Model

const mongoose = require('../../database/mongoose')

const ShowSchema = mongoose.Schema({
    title: { type: String, required: true },
    description: { type: String, required: true },
    startsAt: { type: Date, required: true },
    endsAt: { type: Date, required: true },
    openToBuyAt: { type: Date, required: true },
    closedToBuyAt: { type: Date, required:true },
    status: { type: Boolean, required: true },
    sectors: [{
        name: { type: String, required: true },
        price: { type: Number, required: true },
        availableTickets: { type: Number, required: true }
    }],
    convenienceFee: { type: Number, required: true },
    images: [
        { type: String }
    ]
})

module.exports = mongoose.model('Show', ShowSchema)

预期结果

{
    "status": "success",
    "tickets": [
        {
            "show._id": "ddadadas12a",
            "show.title": "Crazy Show",
            "sectors": [
                {
                    "name": "VIP"
                    "price": 50.25,
                    "availableTickets": 12
                },
                {
                    "name": "General Sector"
                    "price": 20.00,
                    "availableTickets": 5
                }
            ]
        }
    ]
} 

Answer 1

不幸的是你有错误的架构。

你没有＆＃34;可用的门票＆＃34;领域。如果你有任何字段，比如说 availableTickets

你可以这样轻松地做到这一点：

此查询中有两个主要部分：

1. 条件
2. 项目字段：0/1

n-1