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module ApplicationHelper
def avatar_url(user)
default_url = "http://c-walkculture.com/public/style_images/elegant-blue/_custom/welcome_guest.png"
gravatar_id = Digest::MD5.hexdigest(user.email.downcase)
"http://gravatar.com/avatar/#{gravatar_id}.png?s=48&d=#{CGI.escape(default_url)}"
end
end
是,这个头像是用户托管在 Gravatar 的,和 email 对应的。