如何在Rails应用程序上显示Google Map

I apologize for the newbie question. I'm trying to display a very basic google map on my show.html.erb; but for some reason nothing is being displayed. However, in a seperate part my app - different controller and view - a map is able to be generated. I've listed my relevant code below, any help would be greatly appreciated. Thank you so much.I apologize for the newbie question. I'm trying