Formatting rails data to a JSON through a serializer

rails JSON serializer for ember

# a rails controller set up to send user information to ember's profile page
class UsersController < Devise::SessionsController
  
  def show
    @user = User.find(params[:user_id])
    respond_to do |format|
      format.json { render json: @user }
    end
  end
end

# from here, ActiveModel Serializer picks it up.
# to make that work create a serializers- folder in app directory
# then create a _user_serializer.rb file that looks like this:

class UserSerializer < ActiveModel::Serializer
  attributes: :first_name, :last_name
end

# And that's it! Rails is now an API for the Ember app! No more ERB! No more Haml! Forever JSON!