EmberJS making HTTP Post request to Rails API server using ember-ajax

So I have a Rails API and an Ember application. At the moment, my Ember has a login.hbs template and a login.js controller.

I have done a ember install ember-ajax (http://ift.tt/1TtpFhY).

On entering an email and password, I click on the login button which calls my login.js action loginClicked()

I have the following in my login controller:

// login.js controller
import Ember from 'ember';

export default Ember.Controller.extend({
  email: '',
  password: '',

  actions: {
    loginClicked() {
      // alert("email: " + this.get('email') + "\npassword: " + this.get('password'));

      let params = {
        email: this.get('email'),
        password: this.get('password')
      };

      post('/authenticate', {
        params: params
      });
    }
  }
});

In my login.js route handler, I have injected the ember-ajax service:

// login.js route handler
import Ember from 'ember';

export default Ember.Route.extend({
  ajax: Ember.inject.service()
});

The problem is, my Mac terminal console is outputting an error saying:

controllers/login.js: line 16, col 7, 'post' is not defined.

I have also tried injecting the ember-ajax service into my controller but it made no difference.

Am I doing something wrong ?