如何计算另一个 include sequelize 中的 include

Question

我有 3 个 table，我需要计算我的 table 订单有多少 Cupons，我的 table Cupons 属于我的 table 订单，并且我的 table 订单属于我的 table Afiliado，我需要获取所有 'Afiliates'，并获取所有订单和订单的所有 Cupons 并计算 Cupons，我试过这种方式但没有没工作

var Afiliadosorders = afiliados.map(async (item) => {
            return await Afiliados.findByPk(item.id, {
                include: {
                    model: Orders,
                    as: 'Ordens',
                    attributes: {
                        include: [
                            'order_id'
                            [Sequelize.fn("COUNT", Sequelize.col("Cupons.id")), "CuponsCount"]
                        ],
                        separate:true,
                        limit: 1
                    },
                    include: {
                        model: Cupom,
                        as: 'Cupons',
                    },
                },
            })
        })

@编辑它通过@Anatoly 评论解决，通过子查询，如果其他人有同样的问题，最后的解决方案

var Afiliadosorders = afiliados.map(async (item) => {
            return await Afiliados.findByPk(item.id, {
                include: {
                    model: Orders,
                    as: 'Ordens',
                    required: true,
                    attributes: {
                        include: [
                            [Sequelize.literal('(SELECT COUNT(*) FROM cupom where cupom.order_id = "Ordens"."id")'), "Total_Cupons"]
                        ],
                    }
                },
            })
        })
    ````

Answer 1

如果您想在某个Afiliados中获得多少Cupons，那么您可以尝试从Cupons开始以相反的方式进行：

return await Cupom.count({
  include: [{
    model: Orders,
    required: true,
    attributes: [],
    as: 'Ordens',
    where: {
       // indicate the real PK field name here
       afiliadosId: item.id
    }
  }]
})

如果您想获取订单详细信息，则需要使用子查询并删除 Cupom 的 include 选项：

return await Afiliados.findByPk(item.id, {
                include: {
                    model: Orders,
                    as: 'Ordens',
                    attributes: {
                        include: [
                            [Sequelize.literal("SELECT COUNT(*) FROM Cupom where Cupom.order_id = Ordens.id)"), "CuponsCount"]
                        ],
                    },
                },
            })

如何计算另一个 include sequelize 中的 include

How to count an include inside a another include sequelize

node.js

sequelize.js