Javascript MongoDB检查文档/记录是否存在

我试图在mongogb中使用.find（{}），不幸的是它没有给我预期的响应，我不确定如何检查文档是否存在？我想说的是：

如果某个文档确实存在，请执行某些操作。。我给你回信 但如果文档不存在，则创建文档

不幸的是，我知道一个文档并不存在，但它一定是用“if（docs）”拾取了错误的内容，但是当我将它更改为其他内容时，它总是创建记录

守则：

addRefund : (refundCalc, callback) => {
    order_number = refundCalc.refundDetails.customer_details.order.order_number;
    dbconnect.createConnection()
    refund.find({order_number: order_number}, (err, docs) => {
        if (docs) {
            console.log('docss!!!!!!!!!!!!!' + JSON.stringify(docs));
            console.log('calling within error!!!!!!')
            let notStored = {"refundDocStored" : "False"}
            callback(notStored)
            dbconnect.closeConnection();
        }
        else {
            refund.create(refundCalc).then((refunddoc) => {
               let filestored = {"refundDocStored" : "True"}                              
               dbconnect.closeConnection();
               callback(filestored)
            }).catch((err)=> {
                console.log(err);
                dbconnect.closeConnection();
            })
        }
    })
},

模式：

const refundSchema = new Schema({
domain : { type: String},
refundDetails : {
    customer_details : [],
    refund : {
        shipping : {
            amount : { type: Number},
            tax : {type : Number},
            maximum_refundable : {type : Number}
        },
        refund_line_items: [],
        transactions: []   
    }
}

}))

订单存储在以下详细信息中：

"refundDetails":{"customer_details":{"order":{"order_number":1021

这对我来说根本不管用！如果一份文件存在，我似乎无法证明它确实存在

---

任何帮助都会很好，谢谢

您使用了错误的搜索查询。您正在搜索order_number，它是另一个对象内部对象的属性。您必须在查询中引用订单号完整路径，即

{“ReturnCalc.ReturnDetails.customer\u details.order.order\u number”：order\u number}

addRefund : (refundCalc, callback) => {
    order_number = refundCalc.refundDetails.customer_details.order.order_number;
    dbconnect.createConnection()
    refund.find({"refundCalc.refundDetails.customer_details.order.order_number": order_number}, (err, docs) => {
        if (docs) {
            console.log('docss!!!!!!!!!!!!!' + JSON.stringify(docs));
            console.log('calling within error!!!!!!')
            let notStored = {"refundDocStored" : "False"}
            callback(notStored)
            dbconnect.closeConnection();
        }
        else {
            refund.create(refundCalc).then((refunddoc) => {
               let filestored = {"refundDocStored" : "True"}                              
               dbconnect.closeConnection();
               callback(filestored)
            }).catch((err)=> {
                console.log(err);
                dbconnect.closeConnection();
            })
        }
    })
},

---

您使用了错误的搜索查询。您正在搜索order_number，它是另一个对象内部对象的属性。您必须在查询中引用订单号完整路径，即

{“ReturnCalc.ReturnDetails.customer\u details.order.order\u number”：order\u number}

addRefund : (refundCalc, callback) => {
    order_number = refundCalc.refundDetails.customer_details.order.order_number;
    dbconnect.createConnection()
    refund.find({"refundCalc.refundDetails.customer_details.order.order_number": order_number}, (err, docs) => {
        if (docs) {
            console.log('docss!!!!!!!!!!!!!' + JSON.stringify(docs));
            console.log('calling within error!!!!!!')
            let notStored = {"refundDocStored" : "False"}
            callback(notStored)
            dbconnect.closeConnection();
        }
        else {
            refund.create(refundCalc).then((refunddoc) => {
               let filestored = {"refundDocStored" : "True"}                              
               dbconnect.closeConnection();
               callback(filestored)
            }).catch((err)=> {
                console.log(err);
                dbconnect.closeConnection();
            })
        }
    })
},

---

数据保存得很好，只是检查它是否存在。我意识到问题在于使用的搜索查询。改为使用此

{“ReturnCalc.ReturnDetails.customer\u details.order.order\u number”：order\u number}

数据保存良好，只是检查它是否存在。我意识到问题在于使用的搜索查询。改为使用此

{“ReturnCalc.ReturnDetails.customer\u details.order.order\u number”：order\u number}