title: Undefined method 'name' for nil:NilClass
body: <p>I'm getting some kind of nil error; this tells me it's calling <code>nil</code> on <code>'name'</code>, but it does not show me where.</p>
  
  <p>Here are my routes:</p>
  
  <pre><code># Mobile api
    map.namespace :mobile_api do |api|
      api.resources :updates, :only =&gt; [ :index ]
      api.resources :checkouts, :collection =&gt; { :reading_progress =&gt; :put }
    end
  </code></pre>
  
  <p>I am using postman to debug the api call.</p>
  
  <p>Here is the data I send with postman as Raw, JSON as a <code>PUT</code> to the url
  <code>localhost:3000/mobile_api/checkouts/reading_progress</code>:</p>
  
  <pre><code>{"title":"Awesome post!", "tags": ["blue", "jeans"] }
  </code></pre>
  
  <p>When I remove the JSON data and make the request with no data it goes through to the controller.</p>
  
  <pre><code>class MobileApi::CheckoutsController &lt; ApplicationController
    def reading_progress
      binding.pry
    end
  end
  </code></pre>
  
  <p>As soon as I add any data to postman to send, I get this error:</p>
  
  <pre><code>|ruby-1.8.7-p371| ubuntu-francois in ~/sites/mds
  ± |old-state ✗| → ./script/server
  =&gt; Booting Mongrel
  =&gt; Rails 2.3.17 application starting on http://0.0.0.0:3000
  /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/rubyzip2-2.0.2/lib/zip/version.rb:2: warning: already initialized constant VERSION
  =&gt; Call with -d to detach
  =&gt; Ctrl-C to shutdown server
    SQL (0.1ms)   SET NAMES 'utf8'
    SQL (0.1ms)   SET SQL_AUTO_IS_NULL=0
  Error occurred while parsing request parameters.
  Contents:
  
  {"title":"Awesome post!", "tags": ["blue", "jeans"] }
  /!\ FAILSAFE /!\  Mon Jul 15 17:26:37 +0200 2013
    Status: 500 Internal Server Error
    undefined method `name' for nil:NilClass
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/activesupport-2.3.17/lib/active_support/whiny_nil.rb:52:in `method_missing'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/activesupport-2.3.17/lib/active_support/xml_mini/rexml.rb:29:in `merge_element!'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/activesupport-2.3.17/lib/active_support/xml_mini/rexml.rb:18:in `parse'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/activesupport-2.3.17/lib/active_support/xml_mini.rb:12:in `__send__'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/activesupport-2.3.17/lib/active_support/xml_mini.rb:12:in `parse'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/activesupport-2.3.17/lib/active_support/core_ext/hash/conversions.rb:171:in `from_xml'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/actionpack-2.3.17/lib/action_controller/params_parser.rb:34:in `parse_formatted_parameters'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/actionpack-2.3.17/lib/action_controller/params_parser.rb:11:in `call'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/actionpack-2.3.17/lib/action_controller/session/abstract_store.rb:177:in `call'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/activerecord-2.3.17/lib/active_record/query_cache.rb:29:in `call'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/activerecord-2.3.17/lib/active_record/connection_adapters/abstract/query_cache.rb:34:in `cache'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/activerecord-2.3.17/lib/active_record/query_cache.rb:9:in `cache'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/activerecord-2.3.17/lib/active_record/query_cache.rb:28:in `call'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/activerecord-2.3.17/lib/active_record/connection_adapters/abstract/connection_pool.rb:361:in `call'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/actionpack-2.3.17/lib/action_controller/failsafe.rb:26:in `call'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/rack-1.1.6/lib/rack/lock.rb:11:in `call'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/rack-1.1.6/lib/rack/lock.rb:11:in `synchronize'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/rack-1.1.6/lib/rack/lock.rb:11:in `call'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/actionpack-2.3.17/lib/action_controller/dispatcher.rb:114:in `call'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/actionpack-2.3.17/lib/action_controller/reloader.rb:34:in `run'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/actionpack-2.3.17/lib/action_controller/dispatcher.rb:108:in `call'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/rails-2.3.17/lib/rails/rack/static.rb:31:in `call'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/rack-1.1.6/lib/rack/urlmap.rb:47:in `call'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/rack-1.1.6/lib/rack/urlmap.rb:41:in `each'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/rack-1.1.6/lib/rack/urlmap.rb:41:in `call'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/rails-2.3.17/lib/rails/rack/log_tailer.rb:17:in `call'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/rack-1.1.6/lib/rack/content_length.rb:13:in `call'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/rack-1.1.6/lib/rack/chunked.rb:15:in `call'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/rack-1.1.6/lib/rack/handler/mongrel.rb:67:in `process'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/mongrel-1.1.5/lib/mongrel.rb:159:in `process_client'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/mongrel-1.1.5/lib/mongrel.rb:158:in `each'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/mongrel-1.1.5/lib/mongrel.rb:158:in `process_client'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `run'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `initialize'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `new'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `run'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/mongrel-1.1.5/lib/mongrel.rb:268:in `initialize'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/mongrel-1.1.5/lib/mongrel.rb:268:in `new'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/mongrel-1.1.5/lib/mongrel.rb:268:in `run'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/rack-1.1.6/lib/rack/handler/mongrel.rb:38:in `run'
      /home/francois/.rvm/gems/ruby-1.8.7-p371/gems/rails-2.3.17/lib/commands/server.rb:111
      ./script/server:3:in `require'
      ./script/server:3
  </code></pre>
  
  <p>Hope you can help out.</p>