Ruby on rails 3.2 Omniauth YouTube帮助解析响应

我已经正确设置了omniauth，并且我能够解析其他几个提供商的响应，包括YouTube用户的一些属性，但是我无法获取YouTube用户到他们频道的链接。下面是响应的样子，我正在尝试获取最后一行的链接：

--- !ruby/hash:OmniAuth::AuthHash
provider: youtube
uid: http://gdata.youtube.com/feeds/api/users/DLjkduRouoiweRktkkl
info: !ruby/hash:OmniAuth::AuthHash::InfoHash
  uid: http://gdata.youtube.com/feeds/api/users/DLjkduRouoiweRktkkl
  nickname: Example User
  email: exampleuser@gmail.com
  first_name: Example
  last_name: User
  image: http://lh3.googleusercontent.com/-7vCkdsSDAfsU/AAAAAAAAAAA/kjRe3kjk/s88-c-k/photo.jpg
  description: 
  location: Example City CA, US
  channel_title: Example User
  subscribers_count: '66'
credentials: !ruby/hash:Hashie::Mash
  token: kh58.lkjASDF93-W2-ADFJkjfdo498_W8IWnjWTWY
  expires_at: 1354004818
  expires: true
extra: !ruby/hash:Hashie::Mash
  user_hash: !ruby/hash:Hashie::Mash
    xmlns: http://www.w3.org/2005/Atom
    xmlns$media: http://search.yahoo.com/mrss/
    xmlns$gd: http://schemas.google.com/g/2005
    xmlns$yt: http://gdata.youtube.com/schemas/2007
    id: !ruby/hash:Hashie::Mash
      $t: http://gdata.youtube.com/feeds/api/users/DLjkduRouoiweRktkkl
    published: !ruby/hash:Hashie::Mash
      $t: '2012-02-14T23:39:43.000Z'
    updated: !ruby/hash:Hashie::Mash
      $t: '2012-11-27T06:07:22.000Z'
    category:
    - !ruby/hash:Hashie::Mash
      scheme: http://schemas.google.com/g/2005#kind
      term: http://gdata.youtube.com/schemas/2007#userProfile
    title: !ruby/hash:Hashie::Mash
      $t: Example User
      type: text
    content: !ruby/hash:Hashie::Mash
      $t: Example user channel description
      type: text
    link:
    - !ruby/hash:Hashie::Mash
      rel: alternate
      type: text/html
      href: http://www.youtube.com/channel/kljasdSDAF98324
      .
      .
      .

通过在我的用户模型中执行以下操作，我可以在顶部使用昵称：

def add_omniauth(auth)
  user.name = auth["info"]["nickname"]
end

但我到底怎样才能找到最底层的URL呢？我试过：

user.link = auth["extra"]["user_hash"]["link"]["href"]

---

但是没有用。作为一名rails和ruby新手，我感谢您的帮助

好吧，事实证明，youtube响应中的link:是一个数组。您可以分辨，因为它旁边没有列为哈希。我和我的一个朋友在这里谈过之后才知道。因此，为了获得响应底部的链接：

self.url = auth["extra"]["user_hash"]["link"].first["href"]