如何在Meteor中存储特定于客户端的数据服务器端？

Question

Express实现了一个服务器端会话对象,允许您存储特定于客户端的数据.你如何在Meteor中做同等效果的？

strack推荐使用一个集合.如果集合中的对象的id是在连接对象上公开服务器端和客户端的session_id,则这将起作用.

客户端和服务器似乎通过客户端上的LivedataConnection共享session_id:

if (typeof (msg.session) === "string") {
  var reconnected = (self.last_session_id === msg.session);
  self.last_session_id = msg.session;
}

和服务器上的LivedataSession对象:

self.id = Meteor.uuid();

但Meteor API不会公开这些对象.访问会话信息的正确方法是什么？

如果客户端的Session对象与可从Meteor#publish和Meteor#方法访问的客户端唯一的服务器端Session对象同步,那将非常方便.

Answer 1

我为Meteor编写的用户会话智能包正是为此而设计的.它提供了Meteor SessionAPI的所有方法(除了setDefault),还有一些额外的方法.它是被动的,所有的变化都是持久的.最重要的是,它既可以在客户端上使用,也可以在服务器上使用另外的userId参数.

Answer 2

如果你愿意使用Meteor的Auth分支,这就是我做的一些补充评论.我不是Josh答案的粉丝,因为我不相信客户!他们说谎.

在这个例子中,我们会说每个用户都有一个神奇的对象.我们拒绝使用用户可以操纵客户端的任何信息(即会话变量).

在服务器上:

//Create our database
MagicalObjects = new Meteor.Collection("magicalObjects");

// Publish the magical object for the client
Meteor.publish("get-the-magical-object", function () {

//In the auth branch, server and client have access to this.userId
//And there is also a collection of users server side

var uid =  this.userId();
//I make sure that when I make this connection, I've created a magical object 
//for each user. 

//Let's assume this adds a parameter to magical object for the userId
//it's linked to (i.e. magObject.uid = ~user id~ )

//we grab our current user from the users database, and pass to our function
checkUserHasMagicalItem(Meteor.users.findOne({_id: uid}));

var self = this;
console.log('Writing publish');
console.log('uid: ' + this.userId());

var magicalObject = MagicalObjects.findOne({uid: uid});

//Now, I want to know if the magical object is changed -- and update accordingly 
//with its changes -- you might not need this part

//If you don't- then just uncomment these two lines, ignore the rest
//self.set("magicObject", uid, {magicalobject: magicalObject});
//self.flush();

//Here, we're going to watch anything that happens to our magical object
//that's tied to our user
var handle = MagicalObjects.find({uid: uid}).observe({
    added: function(doc, idx)
    {       
    //get the latest version of our object
    magicalObject = MagicalObjects.findOne({uid: uid});
    console.log('added object');
    //now we set this server side
    self.set("magicObject", uid, {magicalobject: magicalObject});
    self.flush();   
    },
     //I'm not concerned about removing, but
    //we do care if it is changed
    changed: function(newDoc, idx, oldDoc)
    {
    console.log('changed object');
    magicalObject = MagicalObjects.findOne({uid: uid});
    self.set("magicObject", uid, {magicalobject: magicalObject});
    self.flush();           
    }       
//end observe

});

//for when the player disconnects
self.onStop(function() {

    console.log('Stopping');
    handle.stop();

//end onStop
});

//end publish
});

在客户端:

//this is the name of our collection client side
MagicalObject = new Meteor.Collection("magicObject");

//notice the name is equal to whatever string you use when you call
//self.set on the server

//notice, this is the name equal to whatever string you use when you
//call Meteor.publish on the server
Meteor.subscribe("get-the-magical-object");

然后,当你想去抓住你的魔法物品时:

var magicObject = MagicalObject.findOne().magicalobject;

请注意.magicalobject不是拼写错误,它是我们在self.set中使用的参数 - {magicalobject:magicalObject}.

我为这个长期答案道歉.但要快速结束:我们做了什么？

在服务器上,我们有一组客户端无权访问的MagicalObjects.相反,我们从魔法对象发布一个对象 - 我们称之为"魔法对象".根据我们设置的内容,每个对象属于一个用户.所以它是op所要求的用户特定对象.

客户端创建一个集合(其名称为"magicalObject"),然后在服务器数据库中的实际数据发生更改时发送数据.此集合只有一个设计对象,但该对象可以有许多参数(例如magicalObject.kazoo或magicalObject.isHarryPotter),或者您可以存储许多不同的对象(例如nonMagicItem).

Answer 3

我认为这就是Session流星的用途——存储客户端所需的信息。

如果您需要将某些内容传递到服务器，也许将其放入 Meteor 集合中？：

Cookies = new Meteor.collection("cookies")

否则，只需使用Session。