adopt-a-hydrant/app/controllers/info_window_controller.rb

class InfoWindowController < ApplicationController
  def index
    @thing = Thing.find_by_id(params[:thing_id])
    view = if @thing.adopted?
      user_signed_in? && current_user == @thing.user ? 'users/thank_you' : 'users/profile'
    else
      user_signed_in? ? 'things/adopt' : 'users/sign_in'
    end
    render view
  end
end