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我是ROR noob誰繼承了一個項目（Ruby版本1.9.3p0，Rails版本3.0.6，rake版本0.9.2），它執行一個耙子作爲cronjob的一部分。這已將「rake aborted！undefined method [] ='for nil：NilClass」輸出到其日誌文件中。當我執行跟蹤我得到以下輸出：當在cron作業中運行rake時，「rake aborted！undefined method`[] ='for nil：NilClass」消息
rake aborted!
undefined method `[]=' for nil:NilClass
/var/www/nostos-source-illiad/lib/nostos-source-illiad/record.rb:48:in `block in charge!'
(eval):22:in `form_with'
/var/www/nostos-source-illiad/lib/nostos-source-illiad/record.rb:47:in `charge!'
/var/www/nostos/app/models/transaction.rb:65:in `block (2 levels) in sync!'
/var/www/nostos/app/models/transaction.rb:58:in `each'
/var/www/nostos/app/models/transaction.rb:58:in `block in sync!'
/var/www/nostos/app/models/transaction.rb:57:in `each'
/var/www/nostos/app/models/transaction.rb:57:in `sync!'
/var/www/nostos/lib/tasks/nostos.rake:17:in `block (2 levels) in <top (required)>'
/home/deployer/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/rake-0.9.2/lib/rake/task.rb:205:in `call'
/home/deployer/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/rake-0.9.2/lib/rake/task.rb:205:in `block in execute'
/home/deployer/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/rake-0.9.2/lib/rake/task.rb:200:in `each'
/home/deployer/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/rake-0.9.2/lib/rake/task.rb:200:in `execute'
/home/deployer/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/rake-0.9.2/lib/rake/task.rb:158:in `block in invoke_with_call_chain'
/home/deployer/.rbenv/versions/1.9.3-p0/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
/home/deployer/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/rake-0.9.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
/home/deployer/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/rake-0.9.2/lib/rake/task.rb:144:in `invoke'
/home/deployer/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:112:in `invoke_task'
/home/deployer/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:90:in `block (2 levels) in top_level'
/home/deployer/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:90:in `each'
/home/deployer/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:90:in `block in top_level'
/home/deployer/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:129:in `standard_exception_handling'
/home/deployer/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:84:in `top_level'
/home/deployer/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:62:in `block in run'
/home/deployer/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:129:in `standard_exception_handling'
/home/deployer/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:59:in `run'
/home/deployer/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/gems/rake-0.9.2/bin/rake:32:in `<top (required)>'
/home/deployer/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/bin/rake:19:in `load'
/home/deployer/.rbenv/versions/1.9.3-p0/lib/ruby/gems/1.9.1/bin/rake:19:in `<main>'
Tasks: TOP => nostos:cron
我無法確定究竟是什麼導致了此問題，並正在尋找一些建議/方向。我不認爲這是由here報道的同一問題引起的，但我不確定。任何幫助，將不勝感激。謝謝！
編輯： 代碼爲nostos:rake可以找到here。
代碼transaction.rb可以找到here。
你能提供'nostos.rake'的代碼嗎？ – 2012-07-11 17:13:51
也可能需要源自nostos-source-illiad的'transaction.rb'和'record.rb'的代碼。答案可以從'transaction.rb'行65找到。 – Mika 2012-07-11 17:25:33
record.rb的代碼可以在[這裏]找到（https://github.com/bricestacey/nostos-source-illiad/blob/master/lib/nostos -source-illiad/record.rb）（我只能添加2個以上的鏈接作爲新用戶 - 對不起！） – jables 2012-07-11 20:31:13