Rails API for fb login with Ionic

I want to build a rails api for fb login using, ionic framework. Till now I've successfully created a web base application and it's successfully authenticating with Facebook.

Now I want to do the same but with ionic based app.

Questions?

1. Is this possible to write a rails api using omniauth and using the fb authentication api with ionic.
2. If it's(1) is possible than what kind of json request is to be made or returned.

Couldn't find anything over the web about it, nor any github project of rails with ionic (fb login).

My Current code:

Controller:

  class SessionsController < ApplicationController
  def create
    user = User.from_omniauth(env["omniauth.auth"])
    session[:user_id] = user.id
    redirect_to root_url


  end

  def destroy
    session[:user_id] = nil
    redirect_to root_url
  end
end

Model:

class User < ActiveRecord::Base
  def self.from_omniauth(auth)
    where(provider: auth.provider, uid: auth.uid).first_or_initialize do |user|
      user.provider = auth.provider
      user.uid = auth.uid
      user.name = auth.info.name
      user.oauth_token = auth.credentials.token
      user.oauth_expires_at = Time.at(auth.credentials.expires_at)
      user.save!
    end
  end
end

Initializers:

OmniAuth.config.logger = Rails.logger
Rails.application.config.middleware.use OmniAuth::Builder do
  provider :facebook, "123", "abc"
end