Hexadecimal color changed to capital letters

The default colors in event_types and difficulty levels are in capital letters and the ones that comes from the color picker were not. Now colors are capitalized before saving the track, level or type. A rake task has also been created to capitalize color from old tracks, levels or types.

app/models/track.rb

@@ -4,7 +4,9 @@ class Track < ActiveRecord::Base
 
   before_create :generate_guid
   validates :name, presence: true
-  validates :color, format: /\A#[0-9a-fA-F]{6}\z/
+  validates :color, format: /\A#[0-9A-F]{6}\z/
+
+  before_validation :capitalize_color
 
   private
 
@@ -15,4 +17,8 @@ class Track < ActiveRecord::Base
 #     end while Person.where(:guid => guid).exists?
     self.guid = guid
   end
+
+  def capitalize_color
+    self.color = color.upcase if color.present?
+  end
 end