Use memcache on repetitive avatar requests in Rails

avatar-caching

def avatar(options = {})
    key = "avatar-#{nickname}-#{options.map {|k,v| "#{k}:#{v}" }.join("-")}"
    cached_avatar = Rails.cache.fetch(key)
    return cached_avatar if cached_avatar
    options.reverse_merge!({size: 48})
    unless model.nil?
      avatar = h.link_to(h.person_path(model)) do
        h.image_tag(avatar_address,
                    class: 'avatar__img',
                    data: { src: avatar_address },
                    alt: nickname,
                    title: nickname,
                    height: options[:size],
                    width: options[:size])
      end
      Rails.cache.write(key, avatar)
      avatar
    end
  end