尝试在 EJS 中使用 FindOne Mongoose 方法答案

【问题标题】：Attempting to Use FindOne Mongoose method with EJS尝试在 EJS 中使用 FindOne Mongoose 方法
【发布时间】：2014-12-15 12:22:44
【问题描述】：

我正在尝试将猫鼬findOne 方法与我的日期模型属性一起使用，以仅使用我最近文档中的数据。我正在使用 EJS 模板系统，并试图在我的视图中使用此方法，但收到错误，} has no method 'findOne' at myevents.findOne` 行。我应该如何使用这种方法？应该在 routes.js 中调用它吗？

eventsModel.js

var mongoose = require('mongoose');
var Schema = mongoose.Schema;

var EventSchema = new Schema({
    name: String,
    title: String,
    company: String,
    url: String,
    date: { type: Date, default: Date.now },
    upcomingEvent: { type: Boolean, default: false }

});

module.exports = mongoose.model('Event', EventSchema);

routes.js

var express = require('express');
var router = express.Router();
var Event = require('./models/eventsModel');



//GET '/'
router.get('/', function(req, res){
    res.render('pages/index.ejs');
});

//GET '/about'
router.get('/about', function(req, res){
    res.render('pages/about.ejs');
});



//GET '/media'
router.get('/media', function(req, res){
    res.render('pages/media.ejs');
});

router.route('/admin/events/create')

    .post(function(req, res){

        var events = new Event();

        events.name = req.body.name;
        events.title = req.body.title;
        events.company = req.body.company;
        events.url = req.body.url;
        events.upcomingEvent = req.body.upcomingEvent;

        events.save(function(err){
            if (err)
                res.send(err);

            res.redirect(303, '/events');

        });
    })

    .get(function(req, res){
        Event.find(function(err, events){
            if (err)
                res.send(err);

            res.render('pages/events-create.ejs');
        });
    });

router.route('/admin/events/:events_id')

    .get(function(req, res){
        Event.findById(req.params.events_id, function(err, events){
            if (err)
                res.send(err);

            res.json(events);
        });
    })

    .put(function(req, res){

        Event.findById(req.params.events_id, function(err, events){
            if (err)
                res.send(err);

            res.json({ message: 'Event Updated'});
        });
    });

//GET '/events'
router.get('/events', function(req, res){

    Event.find(function(err, events){
        if (err)
            res.send(err);

        events.name = req.body.name;
        events.title = req.body.title;
        events.company = req.body.company;
        events.url = req.body.url;
        events.upcomingEvent = req.body.upcomingEvent;

        res.render('pages/events.ejs', {
            events : events
        });
    });
});

module.exports = router; //export all objects in router module

events.ejs

<!DOCTYPE HTML>
<html>
<head>
    <% include ../partials/head %>
</head>

<body>
    <% include ../partials/navigation %>

    <div class="grid" id="lvc-events-title-container">
        <div class="col-1-1">
            <div id="events-heading">
                <h1><i>-EVENTS</i></h1>
            </div>
        </div>
    </div>

    <div class="grid" id="lvc-current-event-container">
        <div class="col-1-1">
            <div id="current-event">
                <% events.findOne({'events.date': -1}, function(events) { %>
                <h2><i>-UPCOMING SPEAKER</i></h2>
                <div id="current-event-image">
                    <img src="http://placehold.it/140x100" id="speaker-image">
                    <h3>John Doe</h3>
                    <p>Title</p>
                    <p>Company</p>

                    <% }); %>
                </div>
            </div>
        </div>
    </div>


    <div class="grid" id="lvc-past-events-container">
        <div class="col-1-1">
            <div id="past-speakers">
            <h2><i>-PAST SPEAKERS</i></h2>
            <% events.forEach(function(events) { %>
            <ul>
                <li><a href="<%= events.url %>"><%= events.name %></a> (<%= events.title %> | <%= events.company %>)</li>
            </ul>
            <% }); %>
            </div>
        </div>
    </div>

</body>
</html>

【问题讨论】：

据我所知，视图中的events 是包装的对象数组。它是javascript数组，你可以用filter代替findOne

标签： node.js mongodb express mongoose ejs

【解决方案1】：

好吧，从我能看出的一些小怪事......

从视图中查询不是一个好主意。您应该在“控制器”或路由中执行查询。
findOne 方法是模型上的 static 方法（如 find 即 Event.find），而不是文档上的 instance 方法（如 save 即 event.save）
您在find 方法返回的数组上设置属性
您只需要订购您的查询；D

路由器：

router.get('/events', function(req, res) {
    Event.find({})
        .sort({'date': -1})
        .exec(function(err, events) {
        if (err)
            res.send(err);

        // Events is an array of event models, so this is setting properties on an array
        // It also doesn't look like you are using it in your view so its not needed
        //events.name = req.body.name;
        //events.title = req.body.title;
        //events.company = req.body.company;
        //events.url = req.body.url;
        //events.upcomingEvent = req.body.upcomingEvent;


        // The events local in your page will be an array with index[0] being the most recent event, which I believe is your 'UPCOMING SPEAKER'. You can then loop over the rest of the array from 1.
        res.render('pages/events.ejs', {
            events : events
        });
    });
});

查看

<div class="grid" id="lvc-current-event-container">
    <div class="col-1-1">
        <div id="current-event">
            <h2><i>-UPCOMING SPEAKER</i></h2>
            <div id="current-event-image">
                <img src="http://placehold.it/140x100" id="speaker-image">
                <h3><%= events[0].name %></h3>
                <p><%= events[0].title %></p>
                <p><%= events[0].compant %></p>
            </div>
        </div>
    </div>
</div>

...

<div class="grid" id="lvc-past-events-container">
    <div class="col-1-1">
        <div id="past-speakers">
        <h2><i>-PAST SPEAKERS</i></h2>
        <% for (var i = 1; i < events.length; i++) { %>
        <ul>
            <li><a href="<%= events[i].url %>"><%= events[i].name %></a> (<%= events[i].title %> | <%= events[i].company %>)</li>
        </ul>
        <% }; %>
        </div>
    </div>
</div>

【讨论】：

【解决方案2】：

我没有非常广泛地使用 Mongoose，但是当您将“事件”数组传递给您的模板时，您已经隐式传递了最新的事件（加上以前的事件）——这意味着您只需要按摩数据一点点以所需的方式显示它。注意：all 方法可能会为您提供更好的服务，因为您似乎没有对事件进行任何过滤。

此代码可能不起作用，并假定 events 数组中的数据按日期排序（将其视为伪代码），但它应该让您走上正确的轨道。

<!DOCTYPE HTML>
<html>
<head>
    <% include ../partials/head %>
</head>

<body>
    <% include ../partials/navigation %>

<div class="grid" id="lvc-events-title-container">
    <div class="col-1-1">
        <div id="events-heading">
            <h1><i>-EVENTS</i></h1>
        </div>
    </div>
</div>

<div class="grid" id="lvc-current-event-container">
    <div class="col-1-1">
        <div id="current-event">
            <h2><i>-UPCOMING SPEAKER</i></h2>
            <div id="current-event-image">
                <img src="http://placehold.it/140x100" id="speaker-image">
                <h3><%= events[0].name %></h3>
                <p><%= events[0].title %></p>
                <p><%= events[0].company %></p>
            </div>
        </div>
    </div>
</div>


<div class="grid" id="lvc-past-events-container">
    <div class="col-1-1">
        <div id="past-speakers">
        <h2><i>-PAST SPEAKERS</i></h2>
        <% for (var i = 1; i < events.length; i++) { %>
        <ul>
            <li><a href="<%= events[i].url %>"><%= events[i].name %></a> (<%= events[i].title %> | <%= events[i].company %>)</li>
        </ul>
        <% }; %>
        </div>
    </div>
</div>

【讨论】：