ProtectedConstructor

Provides a module that may be included in a Ruby class, that protects the constructor; good for enforcing instantiation of classes using, for instance, a class factory. The code itself is not mine, I just wrapped it in a gem and provided the examples; sorry, I don't remember the origin of the code to give credit.

Add this line to your application's Gemfile:

gem 'ProtectedConstructor'

And then execute:

$ bundle

Or install it yourself as:

$ gem install ProtectedConstructor

require 'protected_constructor'

class Klass
  include ProtectedConstructor

  def initialize
  end
end

module KlassFactory
  class << self
    public
    def create
      Klass.send(:new)
    end
  end
end

# Constructor is protected.
klass = Klass.new # NoMethodError

# Example using factory...
klass = KlassFactory::create # works
klass.nil?  # false
klass.is_a?(Klass) # true

# Example just using  #send...
klass = Klass.send(:new)  # works
klass.nil?  # false
klass.is_a?(Klass)  # true

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request