loopback.getCurrentContext() return null

[JoeShi]

I am just following the Using Current Context guide to get the current user. However, it always return null.

The following is my code, same as in the docs, the only modification is the print message.

app.use(function setCurrentUser(req, res, next) {
  if (!req.accessToken) {
    return next();
  }
  app.models.user.findById(req.accessToken.userId, function(err, user) {
    if (err) {
      return next(err);
    }
    if (!user) {
      return next(new Error('No user with this access token was found.'));
    }
    var loopbackContext = loopback.getCurrentContext();


    console.log(loopbackContext);
    console.log('after loopbackContext');

    if (loopbackContext) {
      loopbackContext.set('currentUser', user);
    }
    next();
  });
});

my package.json

{
  "name": "caiyi",
  "version": "0.0.1",
  "main": "server/server.js",
  "scripts": {
    "start": "node .",
    "pretest": "jshint ."
  },
  "dependencies": {
    "compression": "^1.0.3",
    "cors": "^2.5.2",
    "express-flash": "0.0.2",
    "loopback": "^2.22.0",
    "loopback-boot": "^2.6.5",
    "loopback-component-explorer": "^2.1.0",
    "loopback-component-passport": "^2.1.0",
    "loopback-connector-mongodb": "^1.15.2",
    "loopback-datasource-juggler": "^2.39.0",
    "loopback-passport": "^1.0.2",
    "loopback-remote-routing": "^1.3.0",
    "moment": "^2.14.1",
    "qcloud_cos": "^1.0.4",
    "request": "^2.74.0",
    "serve-favicon": "^2.0.1",
    "wechat": "^2.0.3",
    "wechat-api": "^1.28.0",
    "wechat-oauth": "^1.1.1",
    "wechat-pay": "^0.2.4"
  },
  "devDependencies": {
    "grunt": "^0.4.5",
    "jshint": "^2.5.6",
    "grunt-assemble": "^0.4.0",
    "grunt-bump": "0.0.15",
    "grunt-contrib-clean": "^0.6.0",
    "grunt-contrib-concat": "^0.5.0",
    "grunt-contrib-copy": "^0.5.0",
    "grunt-contrib-cssmin": "^0.14.0",
    "grunt-contrib-htmlmin": "^0.3.0",
    "grunt-contrib-sass": "^0.9.2",
    "grunt-contrib-uglify": "^0.5.1",
    "grunt-contrib-watch": "^0.6.1",
    "grunt-sass": "^1.0.0",
    "grunt-usemin": "^3.1.1"
  },
  "repository": {
    "type": "",
    "url": ""
  },
  "description": "caiyi"
}

[alexkolson]

@JoeShi See #2251. In short, getCurrentContext() is not reliable and should be avoided.

[0candy]

@alexkolson Thank you for responding.
@JoeShi Closing this as a dup.