Sails.js:订阅用户对请求的特定操作 [英] Sails.js: Subscribing a User to specific actions on a Request

问题描述

在Sails项目中，我有一个User模型/控制器和一个Request模型/控制器，以及一个Dashboard控制器.用户可以使用RequestController.create请求数据，而管理员可以使用RequestController.grant批准数据.

In my Sails project, I have a User model/controller and a Request model/controller, as well as a Dashboard controller. A user can make a request for data using RequestController.create, and an administrator can approve it using RequestController.grant.

我想要做的是每当一个请求被批准(更新)时通知用户.在RequestController.grant中，我呼叫Request.publishUpdate(...)，在DashboardController.display中，我呼叫

What I want to do is to notify a user whenever one of his/her requests is approved (updated). In RequestController.grant, I call Request.publishUpdate(...), and in my DashboardController.display, I call

Request.find(req.session.user.id, function(err, requests) { 
    ... 
    Request.subscribe(req, requests, ['update']) 
    ... 
});

然后，在视图/dashboard/display中，放入<script>标记:

Then, in the view /dashboard/display, I put in <script> tags:

<script>
// Socket handling for notifications
io.socket.on("request", function(obj) {
    alert(obj.verb);
    alert(obj.data);
    alert(obj.previous);
});
</script>

但是，在批准用户的请求并转到仪表板时，不会显示任何警报. sails.io的脚本已经加载，控制台中没有错误.难道我做错了什么?

However, upon approving a user's request and going to the dashboard, no alerts show up. The script for sails.io is already loaded, with no errors in the console. Am I doing something wrong?

推荐答案

此处可能的问题是您在HTTP调用中使用了Request.subscribe.我假设是这种情况，因为您似乎无法使用DashboardController.display来显示视图.在这种情况下，Request.subscribe根本不执行任何操作(它应该真正显示警告)，因为它可能无法知道要订阅哪个套接字！

The likely problem here is that you're using Request.subscribe in an HTTP call. I'm assuming that's the case since it seems like you're problem using DashboardController.display to display a view. In this case, the Request.subscribe doesn't do anything at all (it should really display a warning) because it can't possibly know which socket to subscribe!

如果您希望保持控制器逻辑不变(您可能会使用requests数组作为本地视图来引导页面上的某些数据)，那就很好了；快速重构将是测试操作中是否进行了套接字调用:

If you'd like to keep your controller logic the same (you might be using the requests array as a view local to bootstrap some data on the page), that's fine; a quick refactor would be to test whether or not its a socket call in the action:

// Also note the criteria for the `find` query below--just sending an
// ID won't work for .find()!
Request.find({user: req.session.user.id}, function(err, requests) { 
    ... 
    // If it's a socket request, subscribe and return success
    if (req.isSocket) {
        Request.subscribe(req, requests, ['update']) 
        return res.send(200);
    } 
    // Otherwise continue on displaying the view
    else {
        ... 
        return res.view('dashboard', {requests: requests});
    }
});

然后在视图的某个位置调用io.socket.get('/dashboard/display')订阅request实例.

Then somewhere in your view call io.socket.get('/dashboard/display') to subscribe to request instances.

如果您将用户ID放在本地，然后将其添加到视图模板中的某个位置，您也可以使用蓝图来订阅来自前端的请求，执行类似io.socket.get('/request?user='+userId)的操作. <script>var userId=<%=user.id%></script>.

You could also use blueprints to subscribe to the requests from the front end, doing something like io.socket.get('/request?user='+userId), if you put the user ID in the locals and add it somewhere in your view template, e.g. <script>var userId=<%=user.id%></script>.

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