Question

我正在尝试将.find（{}）与mongogb一起使用，不幸的是它没有给我期望的响应，我不确定如何检查文档是否存在？我想做的是说：

如果文档确实存在，请执行某些操作。IE将响应发送回但是如果不存在文档，则创建该文档，

不幸的是，我知道一个文档不存在，但是它肯定是用'if（docs）'来拾取错误的东西，但是当我将其更改为其他内容时，它总是会创建记录！？

代码：

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();
            })
        }
    })
},

架构：

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: []   
    }
}

}）;

订单存储在退款详细信息中，如下所示：

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

它似乎根本不适合我！如果文件存在，我似乎无法真正证明它确实存在？

任何帮助都会很棒，谢谢！

Answer 1

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的一个对象的属性。您必须在查询中引用order_number完整路径，即{"refundCalc.refundDetails.customer_details.order.order_number" : order_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();
            })
        }
    })
},

MongoDB检查文档/记录是否存在

1 个答案: