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Contents
module Zena
module Use
module Kpath
module ClassMethods
# kpath selector for the current class
def ksel
self.to_s[0..0]
end
# Replace Rails subclasses normal behavior
def type_condition
" #{table_name}.kpath LIKE '#{kpath}%' "
end
end # ClassMethods
module InstanceMethods
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
private
def set_kpath
self[:kpath] = self.vclass.kpath if vclass_id_changed? or type_changed?
true
end
end # InstanceMethods
end # Kpath
end # Use
end # Zena
Version data entries
17 entries across 17 versions & 1 rubygems