Module: ActiveRecord::Base::DeepCloneable

Included in:
ActiveRecord::Base
Defined in:
lib/deep_cloneable.rb

Defined Under Namespace

Classes: AssociationNotFoundException

Instance Method Summary collapse

Instance Method Details

#deep_clone(*args, &block) ⇒ Object

Deep dups an ActiveRecord model. See README.rdoc



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# File 'lib/deep_cloneable.rb', line 7

def deep_clone *args, &block
  options = args[0] || {}

  dict = options[:dictionary]
  dict ||= {} if options.delete(:use_dictionary)

  kopy = unless dict
    dup()
  else
    find_in_dict_or_dup(dict)
  end

  block.call(self, kopy) if block

  deep_exceptions = {}
  if options[:except]
    exceptions = options[:except].nil? ? [] : [options[:except]].flatten
    exceptions.each do |attribute|
      dup_default_attribute_value_to(kopy, attribute, self) unless attribute.kind_of?(Hash)
    end
    deep_exceptions = exceptions.select{|e| e.kind_of?(Hash) }.inject({}){|m,h| m.merge(h) }
  end

  deep_onlinesses = {}
  if options[:only]
    onlinesses = options[:only].nil? ? [] : [options[:only]].flatten
    object_attrs = kopy.attributes.keys.collect{ |s| s.to_sym }
    exceptions = object_attrs - onlinesses
    exceptions.each do |attribute|
      dup_default_attribute_value_to(kopy, attribute, self) unless attribute.kind_of?(Hash)
    end
    deep_onlinesses = onlinesses.select{|e| e.kind_of?(Hash) }.inject({}){|m,h| m.merge(h) }
  end

  if options[:include]
    normalized_includes_list(options[:include]).each do |association, conditions_or_deep_associations|
      conditions = {}

      if association.kind_of? Hash
        conditions_or_deep_associations = association[association.keys.first]
        association = association.keys.first
      end

      if conditions_or_deep_associations.kind_of?(Hash)
        conditions[:if]     = conditions_or_deep_associations.delete(:if)     if conditions_or_deep_associations[:if]
        conditions[:unless] = conditions_or_deep_associations.delete(:unless) if conditions_or_deep_associations[:unless]
      elsif conditions_or_deep_associations.kind_of?(Array)
        conditions_or_deep_associations.delete_if {|entry| conditions.merge!(entry) if entry.is_a?(Hash) && (entry.key?(:if) || entry.key?(:unless)) }
      end

      dup_options = {}
      dup_options.merge!(:include => conditions_or_deep_associations) if conditions_or_deep_associations.present?
      dup_options.merge!(:except => deep_exceptions[association]) if deep_exceptions[association]
      dup_options.merge!(:only => deep_onlinesses[association]) if deep_onlinesses[association]
      dup_options.merge!(:dictionary => dict) if dict
      dup_options.merge!(:skip_missing_associations => options[:skip_missing_associations]) if options[:skip_missing_associations]

      if association_reflection = self.class.reflect_on_association(association)
        if options[:validate] == false
          kopy.instance_eval do
            # Force :validate => false on all saves.
            def perform_validations(options={})
              options[:validate] = false
              super(options)
            end
          end
        end

        association_type = association_reflection.macro
        association_type = "#{association_type}_through" if association_reflection.is_a?(ActiveRecord::Reflection::ThroughReflection)

        duped_object = send(
          "dup_#{association_type}_association",
          { :reflection => association_reflection, :association => association, :copy => kopy, :conditions => conditions, :dup_options => dup_options },
          &block
        )

        kopy.send("#{association}=", duped_object)
      elsif !options[:skip_missing_associations]
        raise AssociationNotFoundException.new("#{self.class}##{association}")
      end
    end
  end

  return kopy
end