LoadError上需要终端

Question

'./primes.rb' 当我需要 './primes.rb' 在IRB我得到这个：

1.9.3-p392 :004 > require './primes.rb' 
LoadError: cannot load such file -- ./primes.rb 
    from /Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require' 
    from /Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require' 
    from (irb):4 
    from /Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/bin/irb:16:in `<main>' 

这里是primes.rb文件：

# primes.rb 
require 'debugger' 

def prime?(num) 
debugger 
    (1..num).each do |i| 
    if (num % i) == 0 
     return false 
    end 
    end 
end 

def primes(num_primes) 
    ps = [] 
    num = 1 
    while ps.count < num_primes 
    primes << num if prime?(num) 
    end 
end 

if __FILE__ == $PROGRAM_NAME 
    puts primes(100) 
end 

任何有关如何得到这个工作的建议将不胜感激！

当我确实需要相对它给了我这样的：

1.9.3-p392 :010 > require_relative 'primes.rb' 
LoadError: cannot infer basepath 
    from (irb):10:in `require_relative' 
    from (irb):10 
    from /Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/bin/irb:16:in `<main>' 

当我这样做在它下面的第二个解决方案给了我这样的：

1.9.3-p392 :013 > $LOAD_PATH << "." 
=> ["/Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby/1.9.1", "/Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby/1.9.1/x86_64-darwin11.4.2", "/Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby", "/Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/vendor_ruby/1.9.1", "/Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/vendor_ruby/1.9.1/x86_64-darwin11.4.2", "/Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/vendor_ruby", "/Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1", "/Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/x86_64-darwin11.4.2", "."] 
1.9.3-p392 :014 > require 'primes.rb' 
LoadError: cannot load such file -- primes.rb 
    from /Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require' 
    from /Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require' 
    from (irb):14 
    from /Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/bin/irb:16:in `<main>' 
1.9.3-p392 :015 > 

当我尝试在撬：

[4] pry(main)> require_relative 'primes.rb' 
LoadError: cannot infer basepath 
from (pry):2:in `require_relative' 
[5] pry(main)> require 'primes.rb' 
LoadError: cannot load such file -- primes.rb 
from /Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require' 
[6] pry(main)> .ls 
Applications  Movies   git-completion.bash 
Desktop   Music   rails_projects 
Documents  Pictures  ruby 
Downloads  Public   runwithfriends 
Dropbox   code   shopify 
Library   dev   sites 
[7] pry(main)> require 'ruby/app_acad_mini_curriculum/debugging/primes.rb' 
LoadError: cannot load such file -- ruby/app_acad_mini_curriculum/debugging/primes.rb 
from /Users/RBonhardt/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require' 

Answer 1

尝试require_relative

require_relative 'primes.rb' 

编辑： 请注意，这将只能在脚本内工作。如果您要将此脚本require转换为irb会话，则需要提供primes.rb的完整路径。原因是irb的位置在哪里。例如，在irb中尝试Dir.pwd，您会看到require_relative正试图搜索primes.rb。

有几个事情可以做：

# Just need to require the one file. 
require_relative File.join('users', 'yourusername', 'prime_folder', 'prime.rb') 

# Many files in the same folder 
$LOAD_PATH << File.join('users', 'yourusername', 'prime_folder') 
require 'prime.rb' 
require 'another_file.rb' 

另一种选择，一个是我用的，是Pry。它就像irb，很容易从脚本中调用。这是一个宝石如此：

gem install pry 

在脚本的末尾，你可以这样做：

if $0 == __FILE__ 
    require 'pry' 
    binding.pry 
end 

你可以这样落入像REPL的IRB在那里你可以测试和调试方法。没有它我就无法生存。

Answer 2

不像红宝石1.8，你不能要求在同一个文件夹中的文件，因为当前文件夹不再处于加载路径上。

为了模拟红宝石1.8的行为，你可以尝试

$LOAD_PATH << "." 
require 'primes.rb' 

但是，正确的方式在Ruby 1.9的做，因为@CharlesCaldwell指出，使用relative_require。

这是一个good discussion的最佳处理方法。

请注意，relative_require不适用于irb。你可以检查@CharlesCaldwell答案的动机。

但看在你的任务的问题，你不应该使用内部评级法，你应该使用撬：

We're going to use two gems. One is called Pry, which is a replacement for irb. You'll have to gem install pry. It's not essential for debugging that you use Pry, but it will make life nicer.

下面是使用一个例子相对要求：

[fotanus@thing ~]$ cat primes.rb 
# primes.rb 

def prime?(num) 
    (1..num).each do |i| 
    if (num % i) == 0 
     return false 
    end 
    end 
end 

def primes(num_primes) 
    ps = [] 
    num = 1 
    while ps.count < num_primes 
    primes << num if prime?(num) 
    end 
end 

if __FILE__ == $PROGRAM_NAME 
    puts primes(100) 
end 
[fotanus@thing ~]$ cat a.rb 
require_relative 'primes.rb' 
[fotanus@thing ~]$ ruby a.rb