CODEWITHSUNDEEP
rubyoop
George Ananda Eman
George Ananda Eman

Reputation: 3352

How do i require and include a module in the initialize method

Im trying to dynamically require and then include modules inside a initialize method.

# file: object.rb

class Object

  attr_accessor :array

  def initialize array
    @array = array
    @array.each do |f|
      require_relative "#{f}"
      include f.capitalize # the method name is the same as the filename
      puts @variable # property from included method
    end
  end
end

object = Object.new ['a','b','c']

with these module files

# file: a.rb

module A
  @variable = 'string A'
end

and so on for b and c

i keep getting an error :

`block in initialize': undefined method `include'

What am i doing wrong here and is there a better way to achieve what i'm trying to do?

Upvotes: 1

Views: 1673

Answers (2)

undur_gongor
undur_gongor

Reputation: 15954

require_relative "#{f}"

Note the quotation marks. '#{f}' is not interpolated.

Upvotes: 2

sepp2k
sepp2k

Reputation: 370357

The reason that you can't call include in initialize like that is that include is a method that's only defined on classes and modules, but inside of an instance method like initialize the implicit receiver is an object of your class, not the class itself.

Since you only need the methods to be available on the newly created object, you can just use extend instead of include. extend is like a per-object version of include in that it adds the methods of the given module as singleton methods to an object rather than adding them as instance methods to a module or class.

Upvotes: 2

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