Module: Cti::ActiveRecord::ActsAsHeir

Defined in:
lib/cti/active_record/acts_as_heir.rb

Defined Under Namespace

Modules: ClassMethods, InstanceMethods

Instance Method Summary collapse

Instance Method Details

#acts_as_heir_of(predecessor_symbol) ⇒ Object 



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# File 'lib/cti/active_record/acts_as_heir.rb', line 9

def acts_as_heir_of(predecessor_symbol)
  extend ClassMethods
  include InstanceMethods

  if predecessor_symbol.is_a?(String)
    predecessor_symbol = predecessor_symbol.to_sym
  end

  class_attribute :_predecessor_klass, :_predecessor_symbol
  self._predecessor_symbol = predecessor_symbol
  self._predecessor_klass = predecessor_symbol.to_s.camelize.constantize # Object.const_get(predecessor_symbol.to_s.capitalize)

  has_one :predecessor, :as => :heir, :class_name => predecessor_symbol.to_s.camelize, :autosave => true, :dependent => :destroy

  alias_method_chain :predecessor, :build

  # Expose columns from the predecessor
  begin
    self._predecessor_klass.columns.reject{|c| c.primary || c.name =~ /^heir_/}.map(&:name).each do |att|
      define_method(att) do
        predecessor.send(att)
      end
      define_method("#{att}=") do |val|
        predecessor.send("#{att}=",val)
      end
    end
  
  # Expose associations from the predecessor
    self._predecessor_klass.reflect_on_all_associations.reject{|a| a.name == :heir}.each do |association|
      define_method(association.name) do
        predecessor.send(association.name)
      end
      define_method("#{association.name}=") do |val|
        predecessor.send("#{association.name}=",val)
      end
    end
  
  # Include validations from the predecessor
    self._predecessor_klass.validators.each do |validator|
      self.validates_with(validator.class, :attributes => validator.attributes, :options => validator.options)
    end

  # Expose methods from predecessor
    self._predecessor_klass.get_heritage_exposed_methods.each do |method_symbol|
      define_method(method_symbol.to_s) do |*args|
        predecessor.send(method_symbol.to_s, *args)
      end
    end
  rescue
    Rails.logger.error "Databse not set up yet"
  end

  # We need to make sure that updated_at values in the predecessor table is updated when the heir is saved.
  before_update :touch_predecessor, :unless => lambda { predecessor.changed? }

  # This piece deals with errors names
  # and simply strips "predecessor." part from all the predecessor errors.
  after_validation do
    new_errors = {}
    keys_to_delete = []
    errors.each do |e|
      if e =~ /^predecessor/
        new_e = e.to_s.sub("predecessor.", '')
        new_errors[new_e] = errors[e].first
        keys_to_delete << e
      end
    end
    keys_to_delete.each { |k|   errors.delete(k) }
    new_errors.each     { |k,v| errors.add(k, v) }
  end
end

#child_of(parent_symbol) ⇒ Object 



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# File 'lib/cti/active_record/acts_as_heir.rb', line 5

def child_of(parent_symbol)
  acts_as_heir_of(parent_symbol)
end