rosa-build/app/models/avatar.rb

# -*- encoding : utf-8 -*-
class Avatar < ActiveRecord::Base
  self.abstract_class = true

  MAX_AVATAR_SIZE = 5.megabyte
  AVATAR_SIZES = {:micro => 16, :small => 30, :medium => 40, :big => 81}

  AVATAR_SIZES_HASH = {}.tap do |styles|
    AVATAR_SIZES.each do |name, size|
      styles[name] = { :geometry => "#{size}x#{size}#",  :format => :jpg, :convert_options => '-strip -background white -flatten -quality 70'}
    end
  end
  has_attached_file :avatar, :styles => AVATAR_SIZES_HASH
  validates_inclusion_of :avatar_file_size, :in => (0..MAX_AVATAR_SIZE), :allow_nil => true

  attr_accessible :avatar

end