如何删除 Rails 初始值设定项中常量的尾随符号？
如果它位于 config/environment.rb 文件中，如何正确删除以下句子中的尾随字符。
KEY = ENV['KEY'].delete "\r"
它会产生以下错误：
undefined method `delete' for nil:NilClass (NoMethodError)
它在 IRB 中运行良好，但在环境中不起作用。rb
已解决
Aptana Studio 3 在最新更新后停止加载 .bashrc。感谢姆拉登和马克的帮助。
How does one remove trailing character correctly in the following sentence if it's in config/environment.rb file.
KEY = ENV['KEY'].delete "\r"
It produces the following error:
undefined method `delete' for nil:NilClass (NoMethodError)
It works well in IRB, but not in environment.rb
Solved
Aptana Studio 3 stopped to load .bashrc after the latest update. Thanks to Mladen and Mark for help.
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String#chop返回以下内容的副本删除最后一个字符的字符串。它有一个对应的String#chop!，它也会改变字符串。但是，您的特定错误（nil:NilClass 的未定义方法“删除”）意味着
ENV['KEY']返回nil，这当然不会响应 <代码>删除消息。您可以尝试将其强制为字符串。
nil.to_s返回空字符串，并且"".delete x仍将是""。另一方面，如果ENV['KEY']确实正确返回字符串，则与不包含to_s时不会发生任何不同的情况。String#chopreturns a copy of the string with the last character removed. And it has a counterpartString#chop!which mutates the string as well.However, your particular error (undefined method 'delete' for nil:NilClass) means that
ENV['KEY']returnednil, which of course does not respond to thedeletemessage. You could tryto coerce it to a string.
nil.to_sreturns the empty string, and"".delete xwill still be"". On the other hand ifENV['KEY']does correctly return a string, nothing different will happen than if you didn't includeto_s.