DCI for a CMS

gistfile1.rb

# Data: Simple classes that encapsulate properties and associations.
# The only valid operations for a data object, is modify properties
# and associations.
class Site

  attr_reader :content_items

  def initialize
    @content = []
  end

  def create_content(attributes)
    content_items << Content.new(attributes)
  end
end

# Another Data Object
class Content

  attr_reader :title, :child

  def initialize(args)
    @title = args.fetch(:title)
  end

  def add_child(child)
    @child = child
  end
end

# Context: Representing a business concern. All the context does is modify
# attributes or modify associations
class CreatingContent

  # Roles: actors participating in the business concern
  attr_reader :content_repository

  def initialize(content_repository)
    @content_repository = args.fetch(:content_repository)
  end

  def call(attributes)
    content_repository.create_content(attributes)
  end
end

# Another Context
class Publishing
  
  # Roles: actors participating in the business concern
  attr_reader :parent_content, :child_content

  def initialize(args)
    @parent_content = args.fetch(:parent_content)
    @child_content  = args.fetch(:child_content)
  end

  def call
    parent_content.add_child(@child_content)
  end
end

site = Site.new
creating_content = CreatingContent.new(site)
parent = creating_content.call(title: "Parent Content")
child = creating_content.call(title: "Child Content")

publishing = Publishing.new(parent_content: parent, child_content: child)
publishing.call