我正在使用 Rails 3.1.3。我有一个包含很多字段的表单。提交表单后，我收到此错误
ERROR RangeError: exceeded available parameter key space
/home/james/.rvm/gems/ruby-1.9.3-p0/gems/rack-1.3.6/lib/rack/utils.rb:99:in `block in parse_nested_query'
/home/james/.rvm/gems/ruby-1.9.3-p0/gems/rack-1.3.6/lib/rack/utils.rb:93:in `each'
/home/james/.rvm/gems/ruby-1.9.3-p0/gems/rack-1.3.6/lib/rack/utils.rb:93:in `parse_nested_query'
/home/james/.rvm/gems/ruby-1.9.3-p0/gems/rack-1.3.6/lib/rack/request.rb:302:in `parse_query'
/home/james/.rvm/gems/ruby-1.9.3-p0/gems/rack-1.3.6/lib/rack/request.rb:190:in `POST'
/home/james/.rvm/gems/ruby-1.9.3-p0/gems/rack-1.3.6/lib/rack/methodoverride.rb:15:in `call'
/home/james/.rvm/gems/ruby-1.9.3-p0/gems/rack-1.3.6/lib/rack/runtime.rb:17:in `call'
/home/james/.rvm/gems/ruby-1.9.3-p0/gems/activesupport-3.1.3/lib/active_support/cache/strategy/local_cache.rb:72:in `call'
/home/james/.rvm/gems/ruby-1.9.3-p0/gems/rack-1.3.6/lib/rack/lock.rb:15:in `call'
/home/james/.rvm/gems/ruby-1.9.3-p0/gems/actionpack-3.1.3/lib/action_dispatch/middleware/static.rb:53:in `call'
/home/james/.rvm/gems/ruby-1.9.3-p0/gems/railties-3.1.3/lib/rails/engine.rb:456:in `call'
/home/james/.rvm/gems/ruby-1.9.3-p0/gems/rack-1.3.6/lib/rack/content_length.rb:14:in `call'
/home/james/.rvm/gems/ruby-1.9.3-p0/gems/railties-3.1.3/lib/rails/rack/debugger.rb:21:in `call'
/home/james/.rvm/gems/ruby-1.9.3-p0/gems/railties-3.1.3/lib/rails/rack/log_tailer.rb:14:in `call'
/home/james/.rvm/gems/ruby-1.9.3-p0/gems/rack-1.3.6/lib/rack/handler/webrick.rb:59:in `service'
/home/james/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service'
/home/james/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run'
/home/james/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'
显然提交的 k/v 对太多了。解决这个问题的好方法是什么？我想我会用 javascript 拦截表单的提交，然后以某种方式对其进行编码，以便只有一对 k/v，然后将其解码为应用程序服务器上的普通参数哈希。任何有关此方法的指南或更好的方法将不胜感激。
这个问题是由 Rack 几个版本之前引入的。参考这些（1, 2）报告。
我通过将以下代码添加到初始化程序文件来解决该问题。
if Rack::Utils.respond_to?("key_space_limit=")
Rack::Utils.key_space_limit = 262144
end
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