If you ever need to know if an image is portrait or landscape in orientation, you can do the following (assuming you have an orientation attribute on your model:
class Image < ActiveRecord::Base
# Paperclip
has_attached_file :file

# Callbacks
before_create :set_orientation

protected

def set_orientation
original_file = self.file.to_file(:original)
[...]

Over the last few months I’ve realised that the speed at which I develop new projects is a lot quicker than it used to be. So I thought I’d share some of the things I’ve learned and also some quite obvious things (to me at least).
Use a Base Application
I’m obviously going to be horrifically biased [...]