通过数组中的对象字段查找文档

Question

我有一个演出模式，我只想在演出中获得可用的门票。 我需要查找所有具有availableTickets> 0的文档，并仅使用show._id和show.title获得此子文档。 我该怎么办？

// 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，您的架构错误。

您没有“可用票”字段。 如果您有诸如说availableTickets之类的字段

您可以通过以下简单方式执行此操作：

此查询有两个主要部分：

1. 条件
2. 项目领域：0/1

ShowSchema.find({availableTickets : { $gt: 0 }}, { title: 1, description: 0, startsAt: 0, endsAt: 0, openToBuyAt: 0, closedToBuyAt: 0, status: 0, sectors:1, convenienceFee:0, images:0, })