Ruby, including module in current directory

Question

I am currently working through the Well Grounded Rubyist. Great book so far. I am stuck on something I don't quite get with ruby. I have two files

In ModuleTester.rb

class ModuleTester
  include MyFirstModule
end

mt = ModuleTester.new
mt.say_hello

In MyFirstModule.rb

module MyFirstModule
  def say_hello
    puts "hello"
  end
end

When I run 'ruby ModuleTester.rb', I get the following message:

ModuleTester.rb:2:in ': uninitialized constant ModuleTester::MyFirstModule (NameError) from ModuleTester.rb:1:in'

From what I have found online, the current directory isn't in the the namespace, so it can't see the file. But, the include statement doesn't take a string to let me give the path. Since the include statement and require statements do different things, I am absolutely lost as to how to get the include statement to recognize the module. I looked through other questions, but they all seem to be using the require statement. Any hints are greatly appreciated.

Ruby, including module in current directory

2 Answers