Finalizable

This gem makes the specified method non-overridable in Ruby.

• I found the awesome question in stack overflow.
• In the answer section, Original page is intrudoced.
• Original page is not accessible now (2020-02-23).
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Installation

Add this line to your application's Gemfile:

gem 'finalizable'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install finalizable

Usage

see lib/finalizable/example/

Example of parent class which is using final and somewhat_final.

class ParentClass
  include ::Finalizable
  final :final_method_defined_in_parent_class
  somewhat_final :somewhat_final_method_defined_in_parent_class

  def final_method_defined_in_parent_class
    :return_value_from_parent_class
  end

  def somewhat_final_method_defined_in_parent_class
    :return_value_from_parent_class
  end

  def overridable_method_defined_in_parent_class
    :return_value_from_parent_class
  end
end

• If subclass overrides the method final_method_defined_in_parent_class, you will get Finalizable::OverrideError on loading time not runtime.
• If subclass overrides the method somewhat_final_method_defined_in_parent_class, you will get a Kernel#.warn message.

WARNING: Child class 'Finalizable::Example::AClassSomeMethodsAreNotAllowedOverriding' should not override parent class method 'Finalizable::Example::ParentClass.somewhat_final_method_defined_in_parent_class'.

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/[USERNAME]/finalizable.

License

The gem is available as open source under the terms of the MIT License.