Show HN: My first Rails app: Movie Tell

So I finally completed my first Rails app. As it's my first app, I know I've got some things wrong here or there and I could use some advice from more experienced Rails developers.

You can find the app here: https://github.com/danieljaouen/movie_tell

And the associated site here: https://movie-tell.com

I built the site so that I could easily share movie recommendations with friends. As it stands, a standard workflow would look something like:

- sign up to the site

- search users for a friend or family member's email address

- "friend" that user (the user also needs to "friend" you back once they've received your friend request)

- search for a movie you want to share (courtesy of Rotten Tomatoes' API)

- click on the movie's "detail" page

- check the friends you want to recommend the movie to, then click "submit"

One thing I should note here is that my front-end skills are practically nonexistent, so though I appreciate any and all feedback, please try to stick to the critiquing the backend code if possible.

Thanks!