Question

当我尝试将第二个文档插入到我的交易集合中时，我收到了该错误。

架构如下

var mongoose = require('mongoose');
var Schema = mongoose.Schema;

var TransactionSchema = new Schema({
amount: {
    type: Number,
    required: true
},
reference: {
    type: String,
    required: true
},
user: {
    type: mongoose.Schema.Types.ObjectId,
    ref: 'User',
    required: true
}
});

TransactionSchema.index({reference:1}, {unique:true});

module.exports = mongoose.model('Transaction', TransactionSchema);

这是我用来插入文档的代码

var trx = new Transaction();
trx.amount = data.metadata.amount;
trx.user = data.metadata.user_id;
trx.reference = req.query.reference;
console.log(trx);
trx.save(function(err) { //save the transaction
  if(err) {
    console.log(err);
     return res.render('transaction_error', {
       title: "Payment Error", message: "Oooops....An Error occured while attempting to complete the transaction. Please wait a while and try again"
     });
   }

console.log(trx)返回 -

{
  reference: '3t3ktloj2j',
  user: 5a75a5a9c6e49c2be008b262,
  amount: 30000,
  _id: 5a8a902e67ddf65790ed5ddb
}

我已经在集合中有一个事务，这个事务与存储中的事务有不同的参考。

当我尝试添加第二个错误时，我一直收到此错误，不知道它来自哪里。

MongoError: E11000 duplicate key error collection: annka.transactions index: assets_1 dup key: { : null }

Answer 1

此错误表示您正在尝试将重复值保存到具有唯一索引的字段中-这样的字段不能存储重复值。

有关MongoDB中唯一索引的更多信息，请参见：https://docs.mongodb.com/manual/core/index-unique/

MongoError：E11000重复键错误集合：annka.transactions index：assets_1 dup key：{：null}

1 个答案: