Module: XmlActive::ClassMethods

Defined in:
lib/xml_active.rb

Instance Method Summary collapse

Instance Method Details

#many_from_xml(source_xml, options = []) ⇒ Object 



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# File 'lib/xml_active.rb', line 17

def many_from_xml(source_xml, options = [])
  @data_active_options = options
  many_from root_node_in source_xml
end

#one_from_xml(source_xml, options = []) ⇒ Object 



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# File 'lib/xml_active.rb', line 22

def one_from_xml(source_xml, options = [])
  @data_active_options = options

  current_node = root_node_in source_xml

  if current_node.name.underscore.eql?(self.name.underscore)
    # Load or create a new record
    pk_node = current_node.xpath self.primary_key.to_s

    active_record = find_record_based_on(pk_node)

    unless active_record.nil?
      # Process the attributes
      if options.include? :update or options.include? :sync or options.include? :create
        assign_attributes_from current_node, :to => active_record
        if options.include? :fail_on_invalid and !active_record.valid?
          messages = active_record.errors.messages.map {|attribute, messages| "#{attribute} #{messages.map{|message| message }.join(', ')}"}.join(', ')
          raise "Found an invalid #{active_record.class.name} with the following errors: #{messages}. Source: #{current_node.to_s}"
        end
      end

      # Check through associations and apply sync appropriately
      self.reflect_on_all_associations.each do |association|
        foreign_key = foreign_key_from(association)
        klass = association.klass

        case
          when association.macro == :has_many, association.macro == :has_and_belongs_to_many
            instances = instances_for association, :from => current_node, :for => active_record

            child_ids = []
            instances.each do |instance|
              new_record = klass.one_from_xml(instance, options)
              if new_record != nil
                child_ids << new_record[klass.primary_key]
                active_record.__send__(klass.name.underscore.pluralize.to_sym) << new_record
              end
            end

            unless active_record.new_record?
              if options.include?(:sync) or options.include?(:destroy)
                if child_ids.length > 0
                  klass.destroy_all [klass.primary_key.to_s + " not in (?) and #{foreign_key} = ?", child_ids.collect, active_record.attributes[self.primary_key.to_s]]
                else
                  klass.destroy_all
                end
              end
            end

          when association.macro == :has_one
            pk_value = active_record.new_record? ? 0 : active_record.attributes[self.primary_key.to_s]
            single_objects = current_node.xpath("//#{self.name.underscore}[#{self.primary_key}=#{pk_value}]/#{association.name}")
            klass = association.klass
            record = klass.where(foreign_key => active_record.attributes[self.primary_key.to_s]).all
            if single_objects.count == 1
              # Check to see if the already record exists
              if record.count == 1
                db_pk_value = record[0][klass.primary_key]
                xml_pk_value = Integer(single_objects[0].element_children.xpath("//#{self.name.underscore}/#{klass.primary_key}").text)

                if db_pk_value != xml_pk_value
                  # Different record in xml
                  if options.include?(:sync) or options.include?(:destroy)
                    # Delete the one in the database
                    klass.destroy(record[0][klass.primary_key])
                  end
                end
              elsif record.count > 1
                raise "Too many records for one to one association in the database. Found #{record.count} records of '#{association.name}' for association with '#{self.name}'"
              end

              if options.include?(:create) or options.include?(:update) or options.include?(:sync)
                new_record = klass.one_from_xml(single_objects[0], options)
                if new_record != nil
                  new_record[foreign_key.to_sym] = active_record[self.primary_key.to_s]
                  new_record.save!
                end
              end
            elsif single_objects.count > 1
              # There are more than one associations
              raise "Too many records for one to one association in the provided XML. Found #{single_objects.count} records of '#{association.name}' for association with '#{self.name}'"
            else
              # There are no records in the XML
              if record.count > 0 and options.include?(:sync) or options.include?(:destroy)
                # Found some in the database: destroy then
                klass.destroy_all("#{foreign_key} = #{active_record.attributes[self.primary_key.to_s]}")
              end
            end

          when association.macro == :belongs_to

          else
            raise "unsupported association #{association.macro} for #{association.name  } on #{self.name}"
        end
      end

      # Save the record
      if options.include? :sync
        # Doing complete synchronisation with XML
        active_record.save
      elsif options.include?(:create) and active_record.new_record?
        active_record.save
      elsif options.include?(:update) and not active_record.new_record?
        active_record.save
      end
    end

    active_record
  else
    raise "The supplied XML (#{current_node.name}) cannot be mapped to this class (#{self.name})"
  end
end