Module: NestedAttributeReassignable::ClassMethods

Defined in:
lib/nested_attribute_reassignable.rb

Overview

Yes, this could use refactoring love, I do not have time right now D: Just go by the tests.

Instance Method Summary collapse

Instance Method Details

#reassignable_nested_attributes_for(association_name, *args) ⇒ Object 



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# File 'lib/nested_attribute_reassignable.rb', line 55

def reassignable_nested_attributes_for(association_name, *args)
  options = args.extract_options!.symbolize_keys
  options.update({ :allow_destroy => true })
  nonexistent_id = options.delete(:nonexistent_id) || :raise

  accepts_nested_attributes_for(association_name, options.except(:lookup_key))

  define_method "#{association_name}_attributes=" do |attributes|
    reflection_klass  = self.class._reflect_on_association(association_name)
    association_klass = reflection_klass.klass
    association       = association(association_name)
    lookup_key        = options[:lookup_key] || association.klass.primary_key

    Helper.symbolize_keys!(attributes)

    if attributes.is_a?(Array)
      id_attribute_sets = attributes.select { |a| a.has_key?(:id) }

      ids = attributes.map { |a| a[:id] }
      children = association_klass.where(lookup_key => ids)

      # If we're deleting or destroying, we want to validate the record in question
      # is actually part of this relationship
      if id_attribute_sets.any? { |set| Helper.has_destroy_flag?(set) || Helper.has_delete_flag?(set) }
        existing_associated = association.scope.where(lookup_key => ids)
      end

      id_attribute_sets.each do |id_attributes|
        if existing_record = children.find { |c| c.send(lookup_key).to_s == id_attributes[:id].to_s }
          if Helper.has_destroy_flag?(id_attributes)
            if record = existing_associated.find { |e| e.send(lookup_key).to_s == id_attributes[:id].to_s }
              record.mark_for_destruction
              association.add_to_target(record, :skip_callbacks)
            else
              raise_nested_attributes_record_not_found!(association_name, id_attributes[:id])
            end
          elsif Helper.has_delete_flag?(id_attributes)
            if record = existing_associated.find { |e| e.send(lookup_key).to_s == id_attributes[:id].to_s }
              association.add_to_target(record, :skip_callbacks)
              send(association_name).delete(record)
            else
              raise_nested_attributes_record_not_found!(association_name, id_attributes[:id])
            end
          else
            id_attributes[lookup_key] = id_attributes[:id]
            existing_record.assign_attributes(id_attributes.except(:id))
            self.send(association_name).concat(existing_record)
          end
        else
          if nonexistent_id == :create
            new_record = association_klass.new(lookup_key => id_attributes[:id])
            self.send(association_name).concat(new_record)
          else
            raise_nested_attributes_record_not_found!(association_name, id_attributes[:id])
          end
        end
      end
      non_id_attribute_sets = attributes.reject { |a| a.has_key?(:id) }
      non_id_attribute_sets.each do |non_id_attributes|
        self.send(association_name).build(non_id_attributes)
      end
      self.association(association_name).loaded!
    else
      if attributes[:id]
        if Helper.has_destroy_flag?(attributes)
          self.send(association_name).mark_for_destruction
        elsif Helper.has_delete_flag?(attributes)
          send("#{association_name}=", nil)
        elsif existing_record = association_klass.find_by(lookup_key => attributes[:id])
          attributes[lookup_key] = attributes.delete(:id)
          existing_record.assign_attributes(attributes)
          self.send("#{association_name}=", existing_record)
        else
          if nonexistent_id == :create
            new_record = association_klass.new(lookup_key => attributes[:id])
            self.send("#{association_name}=", new_record)
          else
            raise_nested_attributes_record_not_found!(association_name, attributes[:id])
          end
        end
      else
        reflection  = self.class._reflect_on_association(association_name)
        if reflection.has_one? and send(association_name).present?
          raise RelationExists.new(self, association_name)
        else
          super(attributes)
        end
      end
    end
  end
end