MongoDB检查文档/记录是否存在

Question

我试图将.find（{}）与mongogb结合使用，但不幸的是，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，则执行某项操作。.IE发送回响应，但如果文档不存在，则创建该文档，

不幸的是，我知道一个文档不存在，但是它一定是用'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！

编码：

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();
            })
        }
    })
},

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？

任何帮助将是巨大的，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的完整路径，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();
            })
        }
    })
},