Add existing classes into a module

Question

I have some existing ruby classes in a app/classes folder:

class A
   ...
end

class B
   ...
end

I\'d like to group those classes in a mod

Answer 1

If you do want to put them in a module I don't see the point of first including them in the global namespace and then aliasing them inside the module. I think what you want to do (although I doubt it is a good thing to do) is something like this:

file classes/g1.rb

class A1
  def self.a
    "a1"
  end
end

class B1
  def self.b
    "b1"
  end
end

file classes/g2.rb

class A2
  def self.a
    "a2"
  end
end

class B2
  def self.b
    "b2"
  end
end

file imp.rb

module MyModule
  ["g1.rb", "g2.rb"].each do |file|
    self.class_eval open("classes/#{file}"){ |f| f.read }
  end
end

puts defined? MyModule
puts defined? A1
puts defined? MyModule::A1

puts MyModule::A1.a
puts MyModule::B2.b

outputs

constant
nil
constant
a1
b2

I can think of a few disadvantages of this approach (harder to debug for one thing, and probably a bit slower to load although I am only guessing).

Why don't you just do something like this:

Dir["classes/*.rb"].each do |file|
  contents = open(file) { |f| f.read }
  open(file, "w") do |f| 
    f.puts "module MyModule\n"
    contents.each { |line| f.write "  #{line}" }
    f.puts "\nend"
  end
end

That'll fix your classes to be in your module since in ruby you can reopen a module at any time. Then just include them like you do normally.