Question

当我需要一个文件时，例如（名为st.rb）：

require 'rubygems'
require 'mongrel'

class TestHandler < Mongrel::HttpHandler

  def process(request, response)
    response.start(200) do |head, out|
      head["Content-Type"] = "text/html"
      out.write "Hello, World!\n"
    end
  end

end

in irb我得到：

>> require 'st.rb'
LoadError: cannot load such file -- st.rb
    from /usr/local/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from /usr/local/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from (irb):3
    from /usr/local/bin/irb:12:in `<main>'

我可能有一个线索，但这只是猜测。我的ruby版本/安装位置是：

/usr/local/bin/ruby和ruby 1.9.3p0

然而，ruby gems在/usr/local/lib/ruby/1.9.1，它正在谈论版本1.9.1。这可能是原因吗？

谢谢！

更新很奇怪，当我在IRB中键入'put RUBY_VERSION'时，我得到了这个：

puts RUBY_VERSION
1.9.3
NoMethodError: undefined method `write' for nil:NilClass
    from /usr/local/lib/ruby/1.9.1/irb.rb:311:in `printf'
    from /usr/local/lib/ruby/1.9.1/irb.rb:311:in `output_value'
    from /usr/local/lib/ruby/1.9.1/irb.rb:160:in `block (2 levels) in eval_input'
    from /usr/local/lib/ruby/1.9.1/irb.rb:273:in `signal_status'
    from /usr/local/lib/ruby/1.9.1/irb.rb:156:in `block in eval_input'
    from /usr/local/lib/ruby/1.9.1/irb/ruby-lex.rb:243:in `block (2 levels) in each_top_level_statement'
    from /usr/local/lib/ruby/1.9.1/irb/ruby-lex.rb:229:in `loop'
    from /usr/local/lib/ruby/1.9.1/irb/ruby-lex.rb:229:in `block in each_top_level_statement'
    from /usr/local/lib/ruby/1.9.1/irb/ruby-lex.rb:228:in `catch'
    from /usr/local/lib/ruby/1.9.1/irb/ruby-lex.rb:228:in `each_top_level_statement'
    from /usr/local/lib/ruby/1.9.1/irb.rb:155:in `eval_input'
    from /usr/local/lib/ruby/1.9.1/irb.rb:70:in `block in start'
    from /usr/local/lib/ruby/1.9.1/irb.rb:69:in `catch'
    from /usr/local/lib/ruby/1.9.1/irb.rb:69:in `start'
    from /usr/local/bin/irb:12:in `<main>'
Maybe IRB bug!
>>

Answer 1

st.rb所居住的目录很可能不在您的加载路径上。

假设st.rb位于名为lib的目录中，相对于您调用irb的位置，可以将该lib目录添加到ruby使用的目录列表中用这个加载类或模块：

$: << 'lib'

例如，为了调用位于lib目录中的名为'foobar'（foobar.rb）的模块，我需要先将lib目录添加到加载列表中路径。在这里，我只是将lib目录附加到我的加载路径：

irb(main):001:0> require 'foobar'
LoadError: no such file to load -- foobar
        from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
        from /usr/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
        from (irb):1
irb(main):002:0> $:
=> ["/usr/lib/ruby/gems/1.8/gems/spoon-0.0.1/lib", "/usr/lib/ruby/gems/1.8/gems/interactive_editor-0.0.10/lib", "/usr/lib/ruby/site_ruby/1.8", "/usr/lib/ruby/site_ruby/1.8/i386-cygwin", "/usr/lib/ruby/site_ruby", "/usr/lib/ruby/vendor_ruby/1.8", "/usr/lib/ruby/vendor_ruby/1.8/i386-cygwin", "/usr/lib/ruby/vendor_ruby", "/usr/lib/ruby/1.8", "/usr/lib/ruby/1.8/i386-cygwin", "."]
irb(main):004:0> $: << 'lib'
=> ["/usr/lib/ruby/gems/1.8/gems/spoon-0.0.1/lib", "/usr/lib/ruby/gems/1.8/gems/interactive_editor-0.0.10/lib", "/usr/lib/ruby/site_ruby/1.8", "/usr/lib/ruby/site_ruby/1.8/i386-cygwin", "/usr/lib/ruby/site_ruby", "/usr/lib/ruby/vendor_ruby/1.8", "/usr/lib/ruby/vendor_ruby/1.8/i386-cygwin", "/usr/lib/ruby/vendor_ruby", "/usr/lib/ruby/1.8", "/usr/lib/ruby/1.8/i386-cygwin", ".", "lib"]
irb(main):005:0> require 'foobar'
=> true

修改对不起，我完全错过了你使用ruby 1.9.x的事实。所有帐户都会报告您的current working directory has been removed from LOAD_PATH for security reasons，因此您必须执行irb中的操作：

$: << "."

Answer 2

为安全起见其他原因，ruby默认情况下不包含load_path中的当前目录。您可能需要查看此内容以获取更多详细信息 - Why does Ruby 1.9.2 remove "." from LOAD_PATH, and what's the alternative?

Answer 3

如果指定路径，问题就解决了。

e.g。

“require'st.rb'” - ＆gt; “require'./st.rb'”

查看您的问题是否得到解决。

Answer 4

我刚遇到类似的问题。尝试

require './st.rb'

这应该可以解决问题。

Answer 5

我创建了自己的Gem，但是我在加载路径之外的目录中创建了它：

$ pwd
/Users/myuser/projects
$ gem build my_gem/my_gem.gemspec

然后我运行irb并尝试加载宝石：

> require 'my_gem'
LoadError: cannot load such file -- my_gem

我使用全局变量$：检查我的加载路径，并且意识到我正在使用RVM。 rvm在我的加载路径$:中有特定的目录。这些目录都不包含我创建自定义gem的〜/ projects目录。

因此，一种解决方案是修改加载路径本身：

$: << "/Users/myuser/projects/my_gem/lib"

请注意，lib目录位于路径中，该路径包含my_gem.rb文件，该文件在irb中是必需的：

> require 'my_gem'
 => true

现在，如果要在RVM路径中安装gem，则需要运行：

$ gem install my_gem

但是它必须位于rubygems.org之类的存储库中。

$ gem push my_gem-0.0.0.gem
Pushing gem to RubyGems.org...
Successfully registered gem my_gem

ruby LoadError：无法加载此类文件

5 个答案: