Question

我在Heroku上正在运行一个后端。客户端是一个react-app。一切正常，直到发出特定路由器请求为止。

我已经阅读了许多有关在本地运行而不是在Heroku上运行的应用程序的信息。区别在于，我可以启动我的应用程序并正常运行，直到对服务器进行特定的后请求为止。

这是路线。 console.logs用于调试。我首先要检查用户之前没有对该特定答案进行投票，然后该用户才能投票。

router.post('/:qID/answers/:aID/vote-:dir',function(req, res, next) {
    console.log(req.body, "THIS IS THE REQ.BODY");
    console.log(req.params.aID);
        if(req.params.dir.search(/^(up|down)$/) === -1) {
            var err = new Error("Not found");
            err.status = 404;
            next(err);
        } else {
            req.vote = req.params.dir;
            req.userId = req.body.userId;
            next();
        }
    },
    function(req, res, next){
        console.log(req.body, "IS THIS THE SAME VALUE?");
        try{
        User.findById(req.userId, (err, user) => {
            if(err){
                console.log(err, "IS THIS AN ERROR?");
                next(err);
            }
            if(user.answersVoted.length > 0) {
                for(let i = 0; i < user.answersVoted.length; i++){
                    if (user.answersVoted[i] == req.answer._id){
                        req.answered = true;
                    } else {
                        req.answered = false;
                    }
                } return next();
            } else {
                updateAnswerArrayandVote(req, res);
            }
        });
    }catch(err){
        console.log(err, "IS THIS AN ERROR TOO?");
        return next(err);
    }

}, function(req, res, next){
    if(req.answered){
        res.status(422).json({message: "Only vote once!"});
    } else {
        updateAnswerArrayandVote(req, res);
    }
});

这是客户端

handleVote = (id, dir) => {
        if (dir === "up") {
            axios.post(`https://sleepy-falls-59530.herokuapp.com/questions/${this.state.id}/answers/${id}/vote-up`, {
              userId: this.props.userId
            })
            .then(res => {console.log(res)})
            .catch(err => {
              console.log(err);
              this.setState({
                show: true
              })
            })
        } else {
            axios.post(`https://sleepy-falls-59530.herokuapp.com/questions/${this.state.id}/answers/${id}/vote-down`, {
              userId: this.props.userId
            }).then(res => {console.log(res)})
            .catch(err => {
              console.log(err);
              this.setState({
                show: true
              })
            })
        }
    }

这是heroku日志中的错误消息：

]: throw er; // Unhandled 'error' event
2019-07-09T16:04:09.523006+00:00 app[web.1]: ^
2019-07-09T16:04:09.523009+00:00 app[web.1]:
2019-07-09T16:04:09.523012+00:00 app[web.1]: TypeError: Cannot read property 'length' of undefined
2019-07-09T16:04:09.523015+00:00 app[web.1]: at User.findById (/app/routes.js:329:34)
2019-07-09T16:04:09.523017+00:00 app[web.1]: at /app/node_modules/mongoose/lib/model.js:4645:16
2019-07-09T16:04:09.523019+00:00 app[web.1]: at /app/node_modules/mongoose/lib/query.js:4004:12
2019-07-09T16:04:09.523023+00:00 app[web.1]: at process.nextTick (/app/node_modules/mongoose/lib/query.js:2622:28)
2019-07-09T16:04:09.523025+00:00 app[web.1]: at _combinedTickCallback (internal/process/next_tick.js:132:7)
2019-07-09T16:04:09.523027+00:00 app[web.1]: at process._tickCallback (internal/process/next_tick.js:181:9)
2019-07-09T16:04:09.569320+00:00 app[web.1]: npm ERR! code ELIFECYCLE
2019-07-09T16:04:09.570120+00:00 app[web.1]: npm ERR! errno 1
2019-07-09T16:04:09.573462+00:00 app[web.1]: npm ERR! restAPI@1.0.0 start: `node app.js`
2019-07-09T16:04:09.573822+00:00 app[web.1]: npm ERR! Exit status 1
2019-07-09T16:04:09.574525+00:00 app[web.1]: npm ERR!

似乎User.findById（）在heroku中不起作用，因为未定义用户对象上的answersVoted数组。这在本地如何运作，更重要的是，我该如何解决？我知道我正在发送正确的值，因为console.logs显示在日志中（尽管本文中未包括）。预先感谢！

编辑

所以heroku日志给了我这个

MuPuLM8q9i6A1a3uFvUzD8K2EbsGkaRt.QlHmBlMi3ry5ZK',
2019-07-10T18:52:49.981062+00:00 app[web.1]: __v: 1,
2019-07-10T18:52:49.981064+00:00 app[web.1]: answersVoted:
2019-07-10T18:52:49.981066+00:00 app[web.1]: [ '5d0bed720498750dbcc31b3e',
2019-07-10T18:52:49.981067+00:00 app[web.1]: '5ceac5948761ba2b4c2f7a7e',
2019-07-10T18:52:49.981069+00:00 app[web.1]: '5d0bed720498750dbcc31b3e',
2019-07-10T18:52:49.981072+00:00 app[web.1]: '5d17524e4dfec60016a07609',
2019-07-10T18:52:49.981074+00:00 app[web.1]: '5d0bed720498750dbcc31b3e',
2019-07-10T18:52:49.981076+00:00 app[web.1]: '5d17524e4dfec60016a07609',
2019-07-10T18:52:49.981078+00:00 app[web.1]: '5cf90359990b3233a0fbb1ce',
2019-07-10T18:52:49.981080+00:00 app[web.1]: '5d17524e4dfec60016a07609' ] } 'THE USER'
2019-07-10T18:52:49.981088+00:00 app[web.1]: THE USER IS A object
2019-07-10T18:52:49.981159+00:00 app[web.1]: undefined 'THE USERS ANSWERSARRAY'
2019-07-10T18:52:49.983370+00:00 app[web.1]: TypeError: Cannot read property 'length' of undefined

其代码为：

 User.findById(req.userId, async (err, user) => {
            console.log(user, "THE USER");
            console.log("THE USER IS A", typeof user);
            console.log(user.answersVoted, "THE USERS ANSWERSARRAY");

如您所见，我能够使用显示的AnswersVoted-array访问用户对象。

console.log(user)向我显示用户和所有嵌套对象，包括AnswersVoted-array

console.log(user.answersVoted)未定义。

异步错误或与heroku有关的错误（因为它与邮递员一起工作）？请帮忙。

Answer 1

始终记住，如果以后要使用它，例如在快速路由器中，请将该属性实际添加到您的Mongoose模型的架构中。

Route使heroku-app崩溃，但可在localhost

1 个答案: