Memoize dragonfly image dimensions

user.rb

class User < ActiveRecord::Base
  image_accessor :avatar

  serialize :avatar_geometries, Hash

  def avatar_dimensions(geometry)
    unless avatar_geometries.has_key?(geometry)
      thumb = avatar.thumb(geometry)

      avatar_geometries[geometry] = {
        width: thumb.width,
        height: thumb.height
      }

      save
    end

    OpenStruct.new(avatar_geometries[geometry])
  end
end

I believe geometries on lines 10 & 18 should be avatar_geometries no?

@kayluhb Fixed, thanks!