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I'm a little confused about why my project can't load the files it needs, it's a really simple project tree:
processor/ bin/ lib/ processor.rb processor/ mapper.rb reducer.rb and my processor.rb file looks like
require 'processor/mapper' require 'processor/reducer' class Processor end And just for testing it that file mapper looks like:
class Mapper def run puts "running map" end end But running ruby lib/processor.rb results in:
<internal:lib/rubygems/custom_require>:29:in `require': no such file to load -- processor/mapper (LoadError) from <internal:lib/rubygems/custom_require>:29:in `require' from lib/processor.rb:3:in `<class:Processor>' from lib/processor.rb:2:in `<main>' 
407
Ruby by default has a list of directories it can look through when you ask it to load a specific file. This is stored in a variable: $: This is the load path. It initially includes the libdir, archdir, sitedir, vendordir and some others and is information Ruby holds about itself. If you type ruby -e 'puts $LOAD_PATH'
$LOAD_PATH is an array of absolute paths i.e it stores the exact location of all the dependencies in the project. The require keyword searches for the dependencies in the array $LOAD_PATH and tries to load it for the file that has a dependency on certain library.
You should use load function mainly for the purpose of loading code from other files that are being dynamically changed so as to get updated code every time. Require reads the file from the file system, parses it, saves to the memory, and runs it in a given place.
Ruby's $LOAD_PATH will not include your lib directory by default (even though that's where the file you're running is located).
You can either tell the ruby interpreter to include it:
ruby -Ilib lib/processor.rb Or you can add the lib folder to the load path:
$LOAD_PATH.unshift(File.dirname(__FILE__)) require 'processor/mapper' ... If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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