Ruby 'require' error: cannot load such file

Question

I\'ve one file, main.rb with the following content:

require \"tokenizer.rb\"

The tokenizer.rb file is in the same directory and it

Answer 1

The problem is that require does not load from the current directory. This is what I thought, too but then I found this thread. For example I tried the following code:

irb> f = File.new('blabla.rb')
=> #<File:blabla.rb>
irb> f.read
=> "class Tokenizer\n    def self.tokenize(string)\n        return string.split(
\" \")\n    end\nend\n"
irb> require f
LoadError: cannot load such file -- blabla.rb
        from D:/dev/Ruby193/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `req
uire'
        from D:/dev/Ruby193/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `req
uire'
        from (irb):24
        from D:/dev/Ruby193/bin/irb:12:in `<main>'

As it can be seen it read the file ok, but I could not require it (the path was not recognized). and here goes code that works:

irb f = File.new('D://blabla.rb')
=> #<File:D://blabla.rb>
irb f.read
=> "class Tokenizer\n    def self.tokenize(string)\n        return string.split(
\" \")\n    end\nend\n"
irb> require f
=> true

As you can see if you specify the full path the file loads correctly.

Answer 2

I used jruby-1.7.4 to compile my ruby code.

require 'roman-numerals.rb' 

is the code which threw the below error.

LoadError: no such file to load -- roman-numerals
  require at org/jruby/RubyKernel.java:1054
  require at /Users/amanoharan/.rvm/rubies/jruby-1.7.4/lib/ruby/shared/rubygems/custom_require.rb:36
   (root) at /Users/amanoharan/Documents/Aptana Studio 3 Workspace/RubyApplication/RubyApplication1/Ruby2.rb:2

I removed rb from require and gave

require 'roman-numerals' 

It worked fine.

Answer 3

I just tried and it works with require "./tokenizer". Hope this helps.

Answer 4

Ruby 1.9 has removed the current directory from the load path, and so you will need to do a relative require on this file, as David Grayson says:

require_relative 'tokenizer'

There's no need to suffix it with .rb, as Ruby's smart enough to know that's what you mean anyway.

Answer 5

Another nice little method is to include the current directory in your load path with

$:.unshift('.')

You could push it onto the $: ($LOAD_PATH) array but unshift will force it to load your current working directory before the rest of the load path.

Once you've added your current directory in your load path you don't need to keep specifying

 require './tokenizer' 

and can just go back to using

require 'tokenizer'

Answer 6

For those who are absolutely sure their relative path is correct, my problem was that my files did not have the .rb extension! (Even though I used RubyMine to create the files and selected that they were Ruby files on creation.)

Double check the file extensions on your file!