呈现多个查询结果

Question

在我的HTML页面中，我需要显示当天购买的商品总数，并且在下面必须显示所有数据。这很简单，但是我不确定如何在NodeJS中做到这一点。

我正在尝试以下代码：

index.js

var HL = require('../modules/history-list');

app.get('/activity', function (req, res) {
    if (req.session.user == null) {
        res.redirect('/');
    } else {
        HL.getTotalRecords(function (e, count) {
            res.render('activity', {
                title: 'My Activity',
                udata: req.session.user, 
                count: count
            });
        });

        HL.getAllRecords(function (e, activities) {
            res.render('activity', {
                title: 'My Activity',
                udata: req.session.user, 
                activities: activities
            });
        });
    }
});

history-list.js

exports.getTotalRecords = function (callback) {
    let start = moment().startOf('day');
    let end = moment().endOf('day');

    history.aggregate([{
            "$addFields": {
                "date": {
                    "$dateFromString": {
                        "dateString": "$date"
                    }
                }
            }
        },
        {
            "$match": {
                "date": {
                    "$gte": start.toDate(),
                    "$lt": end.toDate()
                }
            }
        },
        {
            "$count": "count"
        }
    ]).toArray(function (e, res) {
        if (e) callback(e)
        else callback(null, res);
    });
}

exports.getAllRecords = function (callback) {
    history.find({}, function (e, res) {
        if (e) callback(e)
        else callback(null, res);
    });

}

我两次重新渲染都遇到Error: Can't set headers after they are sent.错误。我不确定该如何解决。

任何帮助将不胜感激。

谢谢

Answer 1

尝试一下

var HL = require('../modules/history-list');

app.get('/activity', function (req, res) {
    if (req.session.user == null) {
        res.redirect('/');
    } else {
        HL.getTotalRecords(function (e, count) {
            HL.getAllRecords(function (e, activities) {
                res.render('activity', {
                    title: 'My Activity',
                    udata: req.session.user,
                    count: count,
                    activities: activities
                });
            });
        });
    }
});