node.js - Mongoose findOne({电子邮件 : email}) often works rarely doesn't work?

Question

我使用 Mongoose 4.1.11

执行此错误非常非常困难:

console.log("step1"); // that's display every time in my console => ok

models.users.findOne({email: mail}, function (err, myUser) {
    console.log("step2"); // That's very very weird, that's work but RARELY that's doesn't work
    ...

有时，我的 API 服务器会因为这个问题而无法工作，

编辑#1

所以，我将服务器托管从 Gandi 更改为 Heroku。现在，它的效果非常好!感谢您的帮助;-)

Answer 1

您应该使用err回调参数，如下所示；

models.users.findOne({email: mail}, function (err, myUser) {
    if (!err) console.log("step2"); // That's very very weird,that's work but RARELY that's doesn't work
    else console.log(err.message);
    ...

当出现问题时，Mongo 会生成错误对象，您可以通过此用法获取错误原因。