Mongoose.js instance.save()回调没有触发

Question

var mongo = require('mongoose');
var connection = mongo.createConnection('mongodb://127.0.0.1/test');

connection.on("error", function(errorObject){
  console.log(errorObject); 
  console.log('ONERROR');
});

var Schema = mongo.Schema;
var BookSchema = new Schema({ title : {type : String, index : {unique : true}}});
var BookModel = mongo.model('abook', BookSchema);
var b = new BookModel({title : 'aaaaaa'});

b.save( function(e){ 
  if(e){
    console.log('error')
  }else{
    console.log('no error')
}});

终端上不会打印"错误"或"无错误".什么是连接.在'错误'似乎也没有触发.我已经确认MongoDb正在运行.

Answer 1

在这种情况下,您要将模型添加到全局mongoose对象,但打开mongo.createConnection()模型不属于的单独连接.由于模型没有连接,因此无法保存到db.

这可以通过在全局mongoose连接上连接到mongo来解决:

var connection = mongo.createConnection('mongodb://127.0.0.1/test');
// becomes
var connection = mongo.connect('mongodb://127.0.0.1/test');

或者将模型添加到单独的连接中:

var BookModel = mongo.model('abook', BookSchema);
// becomes
var BookModel = connection.model('abook', BookSchema);