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module UserHelper
def user_avatar_url(user = nil, size = nil, default = 'identicon')
size = 40 if size.nil? || size <= 0
if user.blank? || user.avatar_url.blank?
'no_avatar.png'
elsif /^(http(s?):\/\/(www|secure)\.gravatar\.com\/avatar\/(\w*))/ =~ user.avatar_url
Regexp.last_match[0] + "?s=#{size}&d=#{default}"
else
user.avatar_url
end
end
end
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