Rails API + Ember Authentication Implementation

As title suggest i would like to implement user authentication to my ember+rails app.FYI, there are separate apps.I am fairly new to both frameworks and this topic took me over 3 weeks already to solve.I have tried over 5/6 tutorials.None of them was up to date so none of them worked.I am surprised how something so common can ended up so hard to solve for me.

How do you guys implement it? What steps do you guys take to accomplish this task?

I have learned the basics of Ember Simple Auth.I actually can authenticate an ember app with a mock server (mirage).But when it comes to rails, everything has failed so far :(.

Please help me on this matter