Ruby on rails 安全警告：没有为Rack:：Session:：Cookie提供机密选项

当Rails Webrick的服务器启动时，请帮助我解决这个安全问题

rails 3.2.0 ruby 1.9.3p545

prompt>> ~/work/depot$ rails s
=> Booting WEBrick
=> Rails 3.2.0 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
    SECURITY WARNING: No secret option provided to Rack::Session::Cookie.
    This poses a security threat. It is strongly recommended that you
    provide a secret to prevent exploits that may be possible from crafted
    cookies. This will not be supported in future versions of Rack, and
    future versions will even invalidate your existing user cookies.

从：/home/fernando/.rvm/gems/ruby-1.9.3调用-p545@pickaxe/gems/actionpack-3.2.0/lib/action\u dispatch/middleware/session/abstract\u store.rb:28:in'initialize'

这些是我的宝贝

    *** LOCAL GEMS ***

    actionmailer (3.2.0)
    actionpack (3.2.0)
    activemodel (3.2.0)
    activerecord (3.2.0)
    activeresource (3.2.0)
    activesupport (3.2.0)
    arel (3.0.3)
    bigdecimal (1.1.0)
    builder (3.0.4)
    bundler (1.5.3)
    bundler-unload (1.0.2)
    coffee-rails (3.2.2)
    coffee-script (2.2.0)
    coffee-script-source (1.7.0)
    erubis (2.7.0)
    execjs (2.0.2)
    executable-hooks (1.3.1)
    gem-wrappers (1.2.4)
    hike (1.2.3)
    i18n (0.6.9)
    io-console (0.3)
    journey (1.0.4)
    jquery-rails (3.1.0)
    json (1.8.1, 1.5.5)
    mail (2.4.4)
    mime-types (1.25.1)
    minitest (2.5.1)
    multi_json (1.10.1)
    polyglot (0.3.4)
    rack (1.4.5, 1.4.1)
    rack-cache (1.2)
    rack-ssl (1.3.4)
    rack-test (0.6.2)
    rails (3.2.0)
    railties (3.2.0)
    rake (10.3.2, 0.9.2.2)
    rdoc (3.12.2, 3.9.5)
    rubygems-bundler (1.4.2)
    rvm (1.11.3.9)
    sass (3.3.7)
    sass-rails (3.2.6)
    sprockets (2.1.3)
    sqlite3 (1.3.9)
    thor (0.14.6)
    tilt (1.4.1)
    treetop (1.4.15)
    tzinfo (0.3.39)
    uglifier (2.5.0)

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看来谢谢你。这解决了errorrails更新到3.2.13的问题，可以解决这个问题。