javascript - 更新循环内的变量

Question

我正在尝试在循环内更新 var，然后返回到 promise 。但 var 无法更新。到目前为止我已经尝试过了，

var queryPromise = cronie.find({}).
    where('id').equals(req.user._id).
    exec();  //mongoose promise


    queryPromise.then(function(timer) { 
        for (var i = 0, len = timer.length; i < len; i++) {
            x = moment.unix(timer[i].nextTick).format('dddd, MMMM Do, YYYY h:mm:ss A');  //convert to human;
            console.log(x);
            timer[i].nextTick = x;
            console.log(timer[i].nextTick);
          }

          return timer;
    }).then(function(timer) { 
        res.render('dash.ejs', {
            user: req.user,
            timer: timer
        });

    });
});

这是输出:

0|server   | Monday, May 21st, 2018 11:00:00 PM
0|server   | 1526943600
0|server   | Monday, May 21st, 2018 7:28:22 PM
0|server   | 1526930902
0|server   | Monday, May 21st, 2018 7:28:22 PM
0|server   | 1526930902
0|server   | Monday, May 21st, 2018 7:28:22 PM
0|server   | 1526930902
0|server   | Monday, May 21st, 2018 7:28:22 PM
0|server   | 1526930902

但是timer[i].nextTick保持不变。在将其发送到渲染之前如何更新它，以便用户可以看到人类时间而不是时间戳？

更新计时器数组的切片

0|server   |   { _id: 5b031dd6c0d99f79946f263f,
0|server   |     id: '5b031dd5c0d99f79946f263a',
0|server   |     lastTick: 1526930902,
0|server   |     nextTick: 1526930902,
0|server   |     lastUpdate: 1526930902,
0|server   |     __v: 0,
0|server   |     timerStatus: false,
0|server   |     emailStatus: false } 

更新2

添加

timer[i].date =  moment.unix(timer[i].nextTick).format('dddd, MMMM Do, YYYY h:mm:ss A');

然后将 ejs 更改为 timer.date 有效。但分配 nextTick 仍然不行。

Answer 1

您可以使用.lean()使返回的文档成为一个普通的 javascript 对象。这样您以后就可以随意操纵它。

var queryPromise = cronie.find({}).
    where('id').equals(req.user._id).
    lean(). // make returned document be a plain js object
    exec();  //mongoose promise

Documents returned from queries with the lean option enabled are plain javascript objects, not MongooseDocuments. They have no save method, getters/setters or other Mongoose magic applied.