self_preserved.rb

#
#   Simple Context Example:
#
$LOAD_PATH.unshift File.expand_path(File.join(File.dirname(__FILE__), "..", "lib"))

require 'hybrid_dci'

class Foo 
  include HybridDCI::Data
  attr_reader :name ,:children
  
  def initialize(name)
    @name = name
    @children = []
  end
  
end

class SelfPreserve
  include HybridDCI::Context

  role :parent do
    contract :children

    def add_child(child)
      self.children << child
    end
  end

  role :new_child do
    contract :name

    def add_to_parent
      ctx.parent(:call).add_child(self)
      p "#{self.name}: I've been added!"
    end
  end

  def initialize
    @a_foo = Foo.new("Arthur")
    @another_foo = Foo.new("Marvin")
    p "Object ID of another_foo (which will play the role of child): #{@another_foo.object_id}"
    bind_roles(:parent => @a_foo, :new_child=> @another_foo)
  end

  def execute
    in_context do
      new_child(:call).add_to_parent
      p "Object ID of object in parents children array: #{parent.children.map(&:object_id)}"
      p "Object ID of child object #{new_child.object_id}"
    end    
  end
end

context = SelfPreserve.new
context.execute 


# => nil

# >> "Object ID of another_foo (which will play the role of child): 70149730664240"
# >> "Marvin: I've been added!"
# >> "Object ID of object in parents children array: [70149730664240]"
# >> "Object ID of child object 70149730664240"