javascript - 创建多个子对象时，Sequelize 获取父引用

Question

我正在创建一组 Sequelize 模型作为下面的链。创建所有子模型后，如果成功，我想将其重定向到父模型(发票)的详细信息页面。问题是因为我使用了一个循环，我怎么知道所有的 child 都是正确创建的以进行重定向？在重定向代码中，我也想访问父 ID。

Invoice.create({
    //set parent properties
}).then(invoice => { //update company id
    return Company.findOne({where: {id: id}}).then(company => {
        //console.log('setting the company...')
        return invoice.setCompany(company).then(invoice => {return invoice})
    })
}).then(invoice => { //create order items
    orderItems.each((i, v) => {
        invoice.createOrderItem({
        }).then(orderItem => {
            return Product.findOne({where: {id: v.companyId).then(product => {
                //console.log('setting the product...')
                return orderItem.setProduct(product).then(orderItem => {return orderItem})                       
            })
        }).then(orderItem => {
            return Unit.findOne({where: {id: v.unitId}).then(unit => {
                //console.log('setting the unit...')
                return orderItem.setUnit(unit).then(orderItem => {return invoice})
            })
        }).then(invoice => {
            //console.log('returning invoice: ' + invoice)
            return invoice
        }).catch(errOI => {
            console.log('Error while creating order items: ' + errOI)
        })
    })
}).then(invoice => {
    //redirect to detail page
    console.log('I: ' + invoice)
}).catch(errI => {
    console.log('Error while creating invoice: ' + errI)
})

Answer 1

创建一个 Promise 方法，一旦创建了子记录，它就会解析。

循环 orderItems 并调用 Promise 方法

使用 Promise.all 来解析所有的 Promise。

function createChild(v) {
    return new Promise((resolve, reject) => {
        invoice.createOrderItem({})
        .then(orderItem => {
            return Product.findOne({where: {id: v.companyId).then(product => {
                //console.log('setting the product...')
                return orderItem.setProduct(product).then(orderItem => {return orderItem})                       
            })
        })
        .then(orderItem => {
            return Unit.findOne({where: {id: v.unitId}).then(unit => {
                //console.log('setting the unit...')
                return orderItem.setUnit(unit).then(orderItem => {return invoice})
            })
        })
        .then(invoice => {
            //console.log('returning invoice: ' + invoice)
            return invoice;
        })
        .then(invoice => {
            resolve();
        })
        .catch(errOI => {
            console.log('Error while creating order items: ' + errOI)
            reject();
        })
    });
}

Invoice.create({
    //set parent properties
}).then(invoice => { //update company id
    return Company.findOne({where: {id: id}}).then(company => {
        //console.log('setting the company...')
        return invoice.setCompany(company).then(invoice => {return invoice})
    })
}).then(invoice => { //create order items
    return orderItems.map(v => {
        return createChild(v);
    })
}).then(promises => {
    return Promise.all(promises)
    .then(done => {
        // direct the page
    })
})
}).catch(errI => {
    console.log('Error while creating invoice: ' + errI)
})