Add the post resources except destroy.
Add index and show view.
Change belongs_to from user to creator in Post and Comment model.
Add the Post feature.
Add the new/create action of Category.
Extract displaying errors to a partial.
Display categories list and show details.
Display post list in better way.
Add the timestamps to comments table.
Add the Comment feature.
Fix a typo.
Add/Update categories of posts.
Add the fix_url helper.
Add the display_datetime helper.