Rails 4 动态子域 [英] Rails 4 Dynamic Subdomains

问题描述

我正在学习 http://railscasts.com/episodes 上的教程/221-subdomains-in-rails-3 并试图使其适用于 rails 4.我遇到的问题是在我的控制器和 find_by_subdomain 中！标记，我已经阅读了大部分从 rails 4 中取出的 find_by 方法，并且想知道解决方法是什么.

Hi I am following the tutorial at http://railscasts.com/episodes/221-subdomains-in-rails-3 and trying to make it work for rails 4. The problem I encountered is in the my controller and with the find_by_subdomain! tag, I have read that most of the the find_by methods where taken out of rails 4, and was wondering what the work around was.

我的控制器目前看起来像

my controller currently looks like

def set_city
  @city = City.friendly.find_by_subdomain!(request.subdomain)
end

我得到的错误是

undefined method `find_by_subdomain!' 

此外，如果它有助于我目前的路线看起来像

Also in case it helps my routes currently look like

  get '/' => 'cities#show', :constraints => { :subdomain => /.+/ }

非常感谢任何帮助，如果需要，我很乐意澄清.

Any help would by greatly appreciated and I would be happy to clarify if needed.

推荐答案

find_by_* 方法在类本身上:

City.find_by_subdomain!(request.subdomain)

City.friendly 返回了什么?不管它是什么，我怀疑它是 City 类.

What is City.friendly returning? Whatever it is, I doubt it's the City class.

此外，您现在可以将 find_by 与哈希一起使用:

Also, you can use find_by with a hash now:

City.find_by subdomain: request.subdomain

http://guides.rubyonrails.org/active_record_querying.html#retrieving-a-single-对象

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