Domainic::Attributer

Domainic::Attributer is a powerful toolkit that brings clarity and safety to your Ruby class attributes. Ever wished your class attributes could:

• Validate themselves to ensure they only accept correct values?
• Transform input data automatically into the right format?
• Have clear, enforced visibility rules?
• Handle their own default values intelligently?
• Tell you when they change?
• Distinguish between required arguments and optional settings?

That's exactly what Domainic::Attributer does! It provides a declarative way to define and manage attributes in your Ruby classes, ensuring data integrity and clear interfaces. It's particularly valuable for:

• Domain models and value objects
• Service objects and command patterns
• Configuration objects
• Any class where attribute behavior matters

Think of it as giving your attributes a brain - they know what they want, how they should behave, and they're not afraid to speak up when something's not right!

class SuperDev
  include Domainic::Attributer

  argument :code_name, String
  option :power_level, Integer, default: 9000

  option :favorite_gem do
    validate_with ->(val) { val.to_s.end_with?('ruby') }
    coerce_with ->(val) { val.to_s.downcase }
    non_nilable
  end
end

dev = SuperDev.new('RubyNinja', favorite_gem: 'RAILS_RUBY')
dev.favorite_gem  # => "rails_ruby"
dev.power_level = 9001
dev.power_level = 'over 9000'  # Raises ArgumentError: invalid value for Integer

Add this line to your application's Gemfile:

gem 'domainic-attributer'

Or install it yourself as:

gem install domainic-attributer

For detailed usage instructions and examples, see USAGE.md.

We welcome contributions! Please see our Contributing Guidelines for:

• Development setup and workflow
• Code style and documentation standards
• Testing requirements
• Pull request process

Before contributing, please review our Code of Conduct.

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