var ArticleSchema = new Schema({
 created: {
 type: Date,
 default: Date.now
 },
 title: {
 type: String,
 default: '',
 trim: true,
 required: 'Title cannot be blank'
 },
 abstract: {
 type: String,
 default: '',
 trim: true
 },
 abstractImg: {
 type: String,
 default: 'http://www.doocr.com/modules/core/client/img/brand/font-ocr.png',
 trim: true
 },
 content: {
 type: String,
 default: '',
 trim: true
 },
 category: {
 type: String,
 default: 'news',
 trim: true
 },
 user: {
 type: Schema.ObjectId,
 ref: 'User'
 },
 toPublish: {
 type: Boolean,
 default: true
 },
 comments: [CommentSchema]
 });

> db.articles.find( { $text: { $search: "coffee" } } )
Error: error: {
 "waitedMS" : NumberLong(0),
 "ok" : 0,
 "errmsg" : "text index required for $text query",
 "code" : 27
}

db.articles.createIndex( {title: "text", content: "text" })

> db.articles.createIndex(
... {
... title: "text",
... content: "text"
... }
... )

{
 "createdCollectionAutomatically" : false,
 "numIndexesBefore" : 1,
 "numIndexesAfter" : 2,
 "ok" : 1
}

> db.articles.find( { $text: { $search: "coffee" } } )

> db.articles.find( { $text: { $search: "操作" } } )
{ "_id" : ObjectId("58b0eb5a136dc51b541eaf81"), "user" : ObjectId("589c8d22f7d9dc15989be255"), "comments" : [ ], "toPublish" : true, "category" : "blog", "content" : "<p> </p><p><br/></p><p>其实就是使用ubuntu 16的安装方式，参考网址：</p><p><a href=\"https://docs.mongodb.com/master/tutorial/install-mongodb-on-ubuntu/\" target=\"_blank\">https://docs.mongodb.com/master/tutorial/install-mongodb-on-ubuntu/</a></p><p><br/></p><p>我的操作步骤：</p><pre>1.倒入key：sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv EA312927&#10;</pre><p><br/></p><p>2. 创建mongodb的软件源：</p><p>/etc/apt/sources.list.d/mongodb-org-3.2.list</p><p>操作：</p><pre>echo &#34;deb http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.2 multiverse&#34; | sudo tee /etc/apt/sources.list.d/mongodb-org-3.2.list&#10;</pre><p><br/></p><p>3. 更新系统：</p><p>sudo apt update</p><p>之后查看所有可以更新的软件：</p><p>sudo apt list --upgradable</p><p>然后升级所有软件：</p><p>sudo apt upgrade</p><p><br/></p><p>4. 安装mongodb ：</p><p>sudo apt install -y mongodb-org</p><p>也可以指定版本安装：</p><p>sudo apt-get install -y mongodb-org=3.2.8 mongodb-org-server=3.2.8 mongodb-org-shell=3.2.8 mongodb-org-mongos=3.2.8 mongodb-org-tools=3.2.8</p><p>不过我不使用这种方式。</p><p><br/></p><p>5. 添加systemd 自启动条目：</p><p>sudo vim /lib/systemd/system/mongod.service</p><p>添加内容：</p><p>[Unit]</p><p>Description=High-performance, schema-free document-oriented database</p><p>After=network.target</p><p>Documentation=https://docs.mongodb.org/manual</p><p><br/></p><p>[Service]</p><p>User=mongodb</p><p>Group=mongodb</p><p>ExecStart=/usr/bin/mongod --quiet --config /etc/mongod.conf</p><p><br/></p><p>[Install]</p><p>WantedBy=multi-user.target</p><p><br/></p><h2>6. 使能和启动服务：</h2><p>sudo systemctl enable mongod.service</p><p>sudo systemctl start mongod.service</p><p><br/></p><h2>查看状态，一切ok。</h2><p>sudo systemctl status mongod.service</p><p>● mongod.service - High-performance, schema-free document-oriented database</p><p>Loaded: loaded (/lib/systemd/system/mongod.service; enabled; vendor preset: enabled)</p><p>Active: active (running) since Sun 2016-07-31 21:59:00 CST; 13min ago</p><p>Docs: https://docs.mongodb.org/manual</p><p>Main PID: 19374 (mongod)</p><p>CGroup: /system.slice/mongod.service</p><p>└─19374 /usr/bin/mongod --quiet --config /etc/mongod.conf</p><p><br/></p><p>Jul 31 21:59:00 mint systemd[1]: Started High-performance, schema-free document-oriented database.</p><p><br/></p><p>7. 查看服务启动端口是否ok：</p><p>azuo1228@mint ~/webproj/mjs2/meanjs $ netstat -apn | grep mong</p><p>(Not all processes could be identified, non-owned process info</p><p>will not be shown, you would have to be root to see it all.)</p><p>unix 2 [ ACC ] STREAM LISTENING 76731 - /tmp/mongodb-27017.sock</p><p><br/></p><p><br/></p>", "abstractImg" : "http://www.doocr.com/modules/core/client/img/brand/font-ocr.png", "abstract" : "其实就是使用ubuntu 16的安装方式，参考网址：", "title" : "其实就是使用ubuntu 16的安装方式，参考网址：", "created" : ISODate("2017-02-25T02:26:34.483Z"), "__v" : 0 }
>