wells_controller.rb

class WellsController < BaseController
  def follow
    @well = Well.find(params[:id])

    if params['follow'] == 'true'
      authorize! :follow, @well
      current_user.follow(@well)
    else
      # Allow a user to unfollow a well even 
      # if they've reached their limit
      current_user.stop_following(@well)
    end

    render json: current_user.all_following, status: :ok
  end
end