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我的web應用程序使用機架1.4.0，西納特拉V1.2.6，薄v1.2.11，紅寶石v1.9.2p180錯誤與機架抓取基於會話cookie的
導航到頁面我在得到這個錯誤日誌：
TypeError - can't convert nil into String:
/usr/local/lib/ruby/gems/1.9.1/gems/rack-1.4.0/lib/rack/session/cookie.rb:152:in `hexdigest'
/usr/local/lib/ruby/gems/1.9.1/gems/rack-1.4.0/lib/rack/session/cookie.rb:152:in `generate_hmac'
/usr/local/lib/ruby/gems/1.9.1/gems/rack-1.4.0/lib/rack/session/cookie.rb:109:in `unpacked_cookie_data'
/usr/local/lib/ruby/gems/1.9.1/gems/rack-1.4.0/lib/rack/session/cookie.rb:99:in `extract_session_id'
/usr/local/lib/ruby/gems/1.9.1/gems/rack-1.4.0/lib/rack/session/abstract/id.rb:43:in `load_session_id!'
/usr/local/lib/ruby/gems/1.9.1/gems/rack-1.4.0/lib/rack/session/abstract/id.rb:32:in `[]'
/usr/local/lib/ruby/gems/1.9.1/gems/rack-1.4.0/lib/rack/session/abstract/id.rb:262:in `current_session_id'
/usr/local/lib/ruby/gems/1.9.1/gems/rack-1.4.0/lib/rack/session/abstract/id.rb:268:in `session_exists?'
/usr/local/lib/ruby/gems/1.9.1/gems/rack-1.4.0/lib/rack/session/abstract/id.rb:107:in `exists?'
/usr/local/lib/ruby/gems/1.9.1/gems/rack-1.4.0/lib/rack/session/abstract/id.rb:122:in `load_for_read!'
/usr/local/lib/ruby/gems/1.9.1/gems/rack-1.4.0/lib/rack/session/abstract/id.rb:59:in `[]'
/var/www/phrogz.net/routes/test.rb:8:in `logged_in?'
中的代碼test.rb 8號線是：
session[ :foo ] == "BAR"
什麼升級/降級來解決這個問題有什麼建議？
會話[：foo]是否存在？爲什麼不是session [：foo] && session [：foo] ==「BAR」 – three
@three與該更改相同的錯誤（正如人們希望的那樣）;不，在進行檢查時該會話變量不存在。 – Phrogz