Context Error

login.js

import Ember from 'ember';

export default Ember.Controller.extend({
  actions: {
    login: function() {
      var data = {email: this.get("email"), password: this.get("password")}
      var _this = this;
      $.post( "http://localhost:3000/sessions/create", data, function( response ) {
        store = _this.store // _this is undefined
      });
    }
  }
});