Gravatar with options

gistfile1.rb

  require 'digest/md5'
  
  def gravatar(user, options = {})
    email_address = user.email.downcase
    hash = Digest::MD5.hexdigest(email_address)
    image_src = "http://www.gravatar.com/avatar/#{hash}"
    unless options.empty?
      query_string = options.map {|key, value| "#{key}=#{value}"}
      image_src << "?" << query_string.join("&")
    end
    image_tag(image_src)
  end

  <%= gravatar(current_user, { :size => 50, :default => 'identicon' }) %>