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下面是我创建的一个 gem,目的是打开一个 text/README.md 文件并拉出第一行和最后一行。gem 构建正确,但是如果我尝试运行一个单独的文件来调用我构建的 gem,我会收到以下错误消息:

/usr/local/rvm/gems/ruby-1.9.3-p194/gems/nrodruck_test_gem-0.0.1/bin/test_gem:8:in 
`<top (required)>': uninitialized constant TestGem::Myfile (NameError)
    from /usr/local/rvm/gems/ruby-1.9.3-p194/bin/test_gem:19:in `load'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/bin/test_gem:19:in `<main>'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/bin/ruby_noexec_wrapper:14:in `eval'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/bin/ruby_noexec_wrapper:14:in `<main>'

下面是我试图用来运行我的 gem 的文件。该文件需要一个命令行,您可以在其中指定您希望我的 gem 读取的文件。

#!/usr/bin/env ruby

require 'test_gem'

puts "test_gem script executing"
puts ARGV[0]

puts TestGem::MyFile.first( ARGV[0] )

这是宝石:

$LOAD_PATH.unshift File.expand_path("../test_gem", __FILE__)

require 'version'
require 'hello'

module TestGem

  puts "module TestGem defined"

  class MyFile

    def self.first(filename)
        File.open(filename, "r") {|f| f.readline}
    end

    def self.last(filename)
        File.open(filename, "r")[-1]
    end 
  end   
end

编辑

根据评论修复了错字,仍然收到相同的错误消息。

/usr/local/rvm/gems/ruby-1.9.3-p194/gems/nrodruck_test_gem-0.0.1/bin/test_gem:8:
in `<top (required)>': uninitialized constant TestGem::Myfile (NameError)
    from /usr/local/rvm/gems/ruby-1.9.3-p194/bin/test_gem:19:in `load'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/bin/test_gem:19:in `<main>'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/bin/ruby_noexec_wrapper:14:in `eval'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/bin/ruby_noexec_wrapper:14:in `<main>'
4

1 回答 1

0

这是一个错字。您Myfile在尝试调用它时输入了它,而不是MyFile常量的名称。

于 2013-02-17T21:43:00.583 回答