Stuck on most basic part

I can't get the most basic part of the app to work. Specifically, I can't show all the posts in my index.html file.

Here are the facts:
  - I have two posts created in my database
  - I can curl and get valid JSON back — meaning my Rails backend is working
  - I believe the Handlebars syntax in my HTML file is correct
  - I'm certain I have set up my routes in app.js correctly
  - I can't figure out why my getPosts function (line 26) is not returning the data I need for postData in my index.html file.