Ruby `require': cannot load such file (LoadError)

Question

I have a directory structure that looks like this:

 - lib
   - yp-crawler (directory)
      - file-a.rb
      - file-b.rb
      - file-c.rb
   - yp-crawler.rb

My lib/yp-crawler.rb file looks like this:

require "yp-crawler/file-c"
require "yp-crawler/file-b"
require "yp-crawler/file-a"

module YPCrawler
end

When I try to run my file at the command line by doing this:

ruby lib/yp-crawler.rb

I get this error:

`require': cannot load such file -- yp-crawler/file-c (LoadError)
    from .rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from lib/yp-crawler.rb:1:in `<main>'

What could be causing this?

@davidhu2000 Bruv...perfect. That worked. Add it as an answer, and I will accept that. Thanks! — marcamillion
– marcamillion, Commented Sep 28, 2016 at 12:30

davidhu · Accepted Answer · 2016-09-28 12:32:27Z

5

According to API Dock, require_relative is what you need.

Ruby tries to load the library named string relative to the requiring file’s path. If the file’s path cannot be determined a LoadError is raised. If a file is loaded true is returned and false otherwise.

So all you have to do is

require_relative "file-a"
require_relative "file-b"
require_relative "file-c"

answered Sep 28, 2016 at 12:32

davidhu

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marcamillion Over a year ago

Out of curiosity, was this a new change since 1.8/1.9?

Aleksey · Accepted Answer · 2016-09-28 14:02:07Z

3

Another thing you can do is to add the directory to $LOAD_PATH (this is how most of the gems require files).
$LOAD_PATH (aka $:) is where ruby looks for a file when you call require.

So you can try this code

# lib/yp-crawler.rb

$LOAD_PATH.unshift File.expand_path('..', __FILE__)
# it can be $LOAD_PATH.push also

require "yp-crawler/file-c"
require "yp-crawler/file-b"
require "yp-crawler/file-a"

module YPCrawler
end

P.S. For example you can see how paperclip does the same thing.

edited Sep 28, 2016 at 14:02

answered Sep 28, 2016 at 13:35

Aleksey

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1 Comment

engineersmnky Over a year ago

I was just going to post this.

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