Module: Zena::Use::Kpath::InstanceMethods

Included in:
Node
Defined in:
lib/zena/use/kpath.rb

Overview

ClassMethods

Class Method Summary collapse

Class Method Details

.included(base) ⇒ Object 



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# File 'lib/zena/use/kpath.rb', line 17

def self.included(base)
  base.class_eval do
    extend ClassMethods
    
    before_validation :set_kpath
  end
  
  class << base
    # The kpath must be set in the class's metaclass so that each sub-class has its own
    # @kpath.
    
    # kpath is a class shortcut to avoid tons of 'OR type = Page OR type = Document'
    # we build this path with the first letter of each class. The example bellow
    # shows how the kpath is built:
    #           class hierarchy
    #                Node --> N
    #       Note --> NN          Page --> NP
    #                    Document   Form   Section
    #                       NPD      NPF      NPP
    # So now, to get all Pages, your sql becomes : WHERE kpath LIKE 'NP%'
    # to get all Documents : WHERE kpath LIKE 'NPD%'
    # all pages without Documents : WHERE kpath LIKE 'NP%' AND NOT LIKE 'NPD%'
    attr_accessor :kpath

    def kpath
      @kpath ||= make_kpath
    end

    private
      def make_kpath
        superclass.respond_to?(:kpath) ? (superclass.kpath + ksel) : ksel
      end
  end
end