ContextBuilder

This gem provides a way of extending modules with context attributes. Modules that extend Context will receive the class method :context_attr which is used to specify one or more context attributes that the extended module provides. Each of these attributes will be accessible by name on classes that include the extended module. The value of that method is determined as the first non-nil value from a hash provided to initialize_context or one of any number of lookup_NAME methods in the class or any module included by the class.

Add this line to your application's Gemfile:

gem 'context_builder'

And then execute:

$ bundle

Or install it yourself as:

$ gem install context_builder

module Personage

  extend ContextBuilder

  context_attr :name, :age
  context_attr(:race) { |options| options[:race] || options[:ethnicity] }

  def lookup_age
    ENV['AGE']
  end

end

class User

  include Personage

  def initialize(name)
    initialize_context(:name => name, :ethnicity => 'unknown')
  end

  def lookup_age
    'N/A' unless name == 'Greg'
  end

end

User.new('Fred').inspect
>> "#<User name=Fred age=N/A race=unknown>"

ENV['AGE'] = '27'
User.new('Greg').inspect
>> "#<User name=Greg age=27 race=unknown>"

It is important to place 'extend Context' AFTER any self.included methods defined on the extended module. Otherwise, the self.included method will overwrite the one from Context, rendering the 'extend' useless.

1. Fork it ( https://github.com/[my-github-username]/context_builder/fork )
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 a new Pull Request