images get ratios

app/models/merged/image.rb

@@ -1,3 +1,5 @@
+require "mini_magick"
+
 module Merged
   class Image
     include ActiveModel::API
@@ -15,18 +17,27 @@ module Merged
       end
     end
 
-
-    attr_reader :name , :type , :size , :created_at , :updated_at
+    attr_reader :name , :type , :size , :created_at , :height , :width
 
     def initialize(filename)
       @name , @type = filename.split(".")
-      file = File.new(Rails.root.join(Image.asset_root,filename))
+      fullname = Rails.root.join(Image.asset_root,filename)
+      file = File.new(fullname)
+      image = MiniMagick::Image.new(fullname)
+      @width = image.width
+      @height = image.height
       @created_at = file.birthtime
-      @updated_at = file.ctime
       @size = (file.size/1024).to_i
       @@all[@name] = self
     end
 
+    def aspect_ratio
+      ratio = @width.to_f / @height
+      ratios = (1..9).collect{ |i|  ((ratio * i) - (ratio * i).round(0)).abs }
+      min , min_index = ratios.each_with_index.min
+      [(ratio *  (min_index + 1) ).to_i , (min_index + 1) ]
+    end
+
     #save an io with given name (without ending, that is taken from io)
     def self.create_new(filename , io)
       original , ending = io.original_filename.split("/").last.split(".")