Sails js subscribe to model changes scoped by groupid attribute

问题

I have a model named Groupfeed which looks like this

module.exports = {

  schema:true,
  attributes: 
  {
    groupid:
    {
        model:'groups',
        required:true
    },

    postid: 
    {
        model:'post',
        required:true
    },

    objectid: 
    {
        model:'objects',
        required:true
    },
  }
};

On the client side I can subscribe to the Groupfeed model using

io.socket.get('/groupfeed')

which is done automatically by the blueprint api and then

io.socket.on('groupfeed',function(obj){console.log(obj)})

would give me updates on the model changes when I publish on the backend using

Groupfeed.publishCreate({id:4,groupid:6,postid:2,objectid:1})

---

What I want :-

I want a client to subscribe only to groupfeeds from a particular groupid. Eg: User X can subscribe to groupfeeds from groupid 1 (Note: A group model stores user membership for a group )

OR something like this imaginary call:

io.socket.get('/groupfeed?groupid=5')

So that when I call publishCreate with a groupid:5, only people subscribed to groupid 5's groupfeed could get an update

回答1:

You better create different rooms for groups.

CODE UNTESTED! Create a controller: NotificationsController.js

module.exports = {

    subscribe: function(req, res) {
        // Get groupId of user by your method
        .....
        .....
        var roomName = 'group_' + groupId;
        sails.sockets.join(req.socket, roomName);
        res.json({
            room: roomName
        });
    }
}

Somewhere you can create notification:

var roomNameForGroup = 'group_' + groupId;
sails.sockets.blast(roomNameForGroup, {id:4,groupid:6,postid:2,objectid:1});

And in your view:

io.socket.on('connect', function(){
    io.socket.get('/notifications/subscribe', function(data, jwr){
        if (jwr.statusCode == 200){
            io.socket.on(data.room,function(obj){
                console.log(obj);
            });
        } else {
            console.log(jwr);
        }
    });
});

I can not test the code right now, but it looks workable.

来源：https://stackoverflow.com/questions/30253017/sails-js-subscribe-to-model-changes-scoped-by-groupid-attribute