Integrating avatar in Rails

avatar_rails.rb

#- add gem avatar in Gemfile

gem 'avatar', :git => 'git@github.com:yunjian/avatar.git'


#- add sized gravatar source in
# {RAILS_ROOT}/lib/sized_gravatar_source.rb

require 'avatar/source/gravatar_source'

class SizedGravatarSource < Avatar::Source::GravatarSource
  alias_method :parse_options_without_size, :parse_options
  
  def self.sizes
    { :small => 50, :medium => 100, :large => 150, :big => 150 }
  end
  
  def parse_options(profile, options)
    #pass :gravatar_size through, but translate :size or :s to a number if possible
    parsed_options = parse_options_without_size(profile, options)
    [:size, :s].each do |k|
      parsed_options[k] = self.class.sizes[options[k]] if self.class.sizes.has_key?(options[k])
    end
    parsed_options
  end
end


#- add config/initializers/avatar_sources.rb

require 'avatar'
require 'avatar/source/paperclip_source'
require 'avatar/source/source_chain'
require 'avatar/source/static_url_source'
require 'avatar/source/wrapper/rails_asset_source_wrapper'
require 'avatar/source/wrapper/string_substitution_source_wrapper'
require 'sized_gravatar_source'

default = Avatar::Source::Wrapper::RailsAssetSourceWrapper.new(
  Avatar::Source::Wrapper::StringSubstitutionSourceWrapper.new(
    Avatar::Source::StaticUrlSource.new('/images/avatar_default_#{size}.png'),
    {:size => :small}
  )
)

chain = Avatar::Source::SourceChain.new
chain << Avatar::Source::PaperclipSource.new(:icon)
chain << Avatar::Source::TwitterSource.new(:twitter_name)
chain << SizedGravatarSource.new(default, :email)

Avatar::source = chain


#- add helper function

require 'avatar/view/action_view_support'
include Avatar::View::ActionViewSupport
def icon profile, size = :small, img_opts = {}
  return "" if profile.nil?
  img_opts = {:title => profile.name, :alt => profile.name, :class => size}.merge(img_opts)
  link_to(avatar_tag(profile, {:size => size, :paperclip_style => size}, img_opts), profile_path(profile)) rescue ''
end


#- in view
<div class="avatar"><%= icon @lesson, :big %></div>