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module UsersHelper
def user_gravatar_image_tag(user, size = 64)
gravatar_image_tag user.email, :alt => "", :class => "preview", :gravatar => { :default => user_default_avatar , :size => size }
end
def user_default_avatar
return "#{authenticated_root_url}#{image_path('icons/user.png')}" if Rails.application.config.relative_url_root.blank?
relative_url_root = Rails.application.config.relative_url_root.gsub( /\//, '')
"#{authenticated_root_url}#{image_path('icons/user.png')}".
sub( Regexp.new("/#{relative_url_root}/#{relative_url_root}/"), "/#{relative_url_root}/").
sub( Regexp.new("/#{relative_url_root}//#{relative_url_root}/"), "/#{relative_url_root}/")
end
end
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