mongoose find（）返回空数组

Question

我从git克隆了easyERP源代码。他们有这些代码行来生成某种模式。这是最新发生的事情

1. 连接正常

2. 已成功生成mainDBSchema

3. var main似乎也很好，当我控制这个对象时，我得到了模型和模型。

4. 唯一的问题是main.find（）。exec（）返回空数组。我绑了各种各样的黑客，但似乎没什么用。

   var mainDb = mongoose.createConnection('localhost', 'mainDB');
   
   mainDb.on('error', console.error.bind(console, 'connection error:'));
   mainDb.once('open', function callback() {
   console.log("Connection to mainDB is success");
   var mainDBSchema = mongoose.Schema({
       _id: Number,
       url: { type: String, default: 'localhost' },
       DBname: { type: String, default: '' },
       pass: { type: String, default: '' },
       user: { type: String, default: '' }
   }, { collection: 'easyErpDBS' });
   
   var main = mainDb.model('easyErpDBS', mainDBSchema);
   
   main.find().exec(function (err, result) {
       if (!err) {
           result.forEach(function (_db, index) {
               var dbInfo = {
                   DBname: '',
                   url: ''
               };
               var dbObject = mongoose.createConnection(_db.url, _db.DBname);
               dbObject.on('error', console.error.bind(console, 'connection error:'));
               dbObject.once('open', function callback() {
                   console.log("Connection to " + _db.DBname + " is success" + index);
                   dbInfo.url = result[index].url;
                   dbInfo.DBname = result[index].DBname;
                   dbsArray[index] = dbObject;
                   dbsNames[index] = dbInfo;
               });
           });
       } else {
           console.log(err);
       }
   });
   });