Generated a model 'Comments' and added a few fields, migrated
Added body field to 'Comments'
Set up relationship between Articles and Comments
Show a list of Comments
Added a route for Comments
Added a partial Comment form within Article show
Generated the Comments controller
Updated the Comment controller so that it saves the comment

Had to reference the article_id in the params safely and delete the
article_id from the hash.

Made and saved the comment as usual but referenced the article_id for
the comment's article_id