Store session in operation hook - Loopback

Question

I want to store some data other than userId or accessToken to store in a session, in after save or before save operation hook in Loopback application using express-session.

I have this in my server/server.js :

....
const session = require('express-session');
const MongoStore = require('connect-mongo')(session);
....

app.use(session({
    name:'session-name',
    secret: 'keyboard cat',
    store: new MongoStore({url: 'mongodb://localhost/test', ttl:1}),
    resave: false,
    saveUninitialized: true
}));

And as I'm defining the remote-method with some parameters it actually passing the parameter and not the req object, so I can't do it the express way.

How can I use the session to store and get value?

EDIT : I have found a way to set the session in remote method, by adding this to my model.json's remote-method :

"accepts": [
    {
        "arg": "req",
        "type": "object",
        "http": {
            "source": "req"
        }
    }
]

And, adding the req parameter to the remote-method function,

Model.remoteMethod = function (req, callback) {
    req.session.data = { 'foo': 'bar' }
    callback(null)
};

Now, the issue is I want to get this session value in operation hook

Model.observe('before save', function (ctx, next) {
    //How to get the session here?
})

Answer 1

try this now :

you can set ctx value :

var LoopBackContext = require('loopback-context');

    MyModel.myMethod = function(cb) {
      var ctx = LoopBackContext.getCurrentContext();
      // Get the current access token
      var accessToken = ctx && ctx.get('accessToken');
      ctx.set('xx', { x: 'xxxx' } );

    }

it's get ctx value :

 module.exports = function(MyModel) {
      MyModel.observe('access', function(ctx, next) {
        const token = ctx.options && ctx.options.accessToken;
        const userId = token && token.userId;
        const modelName = ctx.Model.modelName;
        const scope = ctx.where ? JSON.stringify(ctx.where) : '<all records>';
        console.log('%s: %s accessed %s:%s', new Date(), user, modelName, scope);
        next();
      });
    };

loopback context store userId and accesTokan. in whole web you can access using ctx it's work like session in loopback.