升级到 Rails 2.3.11 时出错（HashWithIndifferentAccess 错误）答案

【问题标题】：Error while upgrading to Rails 2.3.11 (HashWithIndifferentAccess error)升级到 Rails 2.3.11 时出错（HashWithIndifferentAccess 错误）
【发布时间】：2012-07-13 15:23:18
【问题描述】：

每当我尝试创建或更新我们的应用使用的环境时，我都会得到以下信息：

NoMethodError (undefined method `base_url' for #<HashWithIndifferentAccess:0x107162f08>):
  app/controllers/environments_controller.rb:64:in `check_base_url_for_https'
  app/controllers/environments_controller.rb:56:in `update'
  haml (3.0.22) lib/sass/plugin/rack.rb:41:in `call'
  airbrake (3.0.4) lib/airbrake/rack.rb:27:in `call'
  airbrake (3.0.4) lib/airbrake/user_informer.rb:12:in `call'
  /Users/jasonbodak/.rvm/rubies/ree-1.8.7-2011.03/lib/ruby/1.8/webrick/httpserver.rb:104:in `service'
  /Users/jasonbodak/.rvm/rubies/ree-1.8.7-2011.03/lib/ruby/1.8/webrick/httpserver.rb:65:in `run'
  /Users/jasonbodak/.rvm/rubies/ree-1.8.7-2011.03/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'
  /Users/jasonbodak/.rvm/rubies/ree-1.8.7-2011.03/lib/ruby/1.8/webrick/server.rb:162:in `start'
  /Users/jasonbodak/.rvm/rubies/ree-1.8.7-2011.03/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'
  /Users/jasonbodak/.rvm/rubies/ree-1.8.7-2011.03/lib/ruby/1.8/webrick/server.rb:95:in `start'
  /Users/jasonbodak/.rvm/rubies/ree-1.8.7-2011.03/lib/ruby/1.8/webrick/server.rb:92:in `each'
  /Users/jasonbodak/.rvm/rubies/ree-1.8.7-2011.03/lib/ruby/1.8/webrick/server.rb:92:in `start'
  /Users/jasonbodak/.rvm/rubies/ree-1.8.7-2011.03/lib/ruby/1.8/webrick/server.rb:23:in `start'
  /Users/jasonbodak/.rvm/rubies/ree-1.8.7-2011.03/lib/ruby/1.8/webrick/server.rb:82:in `start'

正如我在标题中所说，我最近升级到 Rails 2.3.11。这个错误以前从未发生过。这是我的environments_controller.rb中发生错误时正在执行的代码：

def check_base_url_for_https
  @environment = params[:environment]
  if /^https:\/\//i =~ @environment.base_url 
    @ajax_flash = "<ul class='notice'><li>The website you are trying to test is a secure site.  If you are using self-signed SSL certificates please see our <a href='http://support.janova.us'>Support Site</a> and search for SSL for important tips on how to access your site.</li></ul>"
  end
end

有谁知道为什么这段代码（特别是 if /^https:\/\//i =~ @environment.base_url 行不再适用于 Rails 2.3.11？

我想补充一点，我的 app/models/environment.rb 中的代码似乎也很合理：

def base_url 
  self[:base_url].try(:gsub, /\$/, '') 
end

有人看到上面的代码有什么问题吗？

【问题讨论】：

你能用root_url代替吗？
我确实尝试了 root_url 并得到了同样的错误。
您是否真正检查过@environment 变量包含的内容？错误消息表明它是HashWithIndifferentAccess 的一个实例，并且该类没有base_url 方法，这似乎很合理。尝试将@environment.inspect 打印到日志中，看看会发生什么。
是的，我确实查看了@environment 中包含的内容。在我看来是对的。这是@environment.inspect 返回的：{"name"=>"Janova HTML Reference", "dns_mapping_domain_name"=>"", "ssh_user"=>"", "ssh_host"=>"", "default"=>"0", "ssh_port"=>"", "base_url"=>"http://janova-reference.heroku.com", "dns_mapping_ip_address"=>""}

标签： ruby-on-rails upgrade url-validation

【解决方案1】：

我想通了：params[:environment] 被定义为哈希。谢谢你，弗罗斯特，强迫我看到这个。因此，我将行 @environment = params[:environment] 更改为 @environment = Environment.new(params[:environment]) 并且它起作用了。

【讨论】：