new_contents: """This prints the state of a logical file.
  
  * By default, prints errors on stdout.
  * Optional argument --log: logs output to system log.
  """
  
  from django.core.management.base import BaseCommand
  from hs_core.models import BaseResource, ResourceFile
  
  
  def debug_resource(short_id):
      """ Debug view for resource depicts output of various integrity checking scripts """
  
      try:
          res = BaseResource.objects.get(short_id=short_id)
      except BaseResource.DoesNotExist:
          print("{} does not exist".format(short_id))
  
      resource = res.get_content_model()
      assert resource, (res, res.content_model)
  
      if resource.resource_type == 'CompositeResource':
          istorage = resource.get_irods_storage()
          resource.create_aggregation_xml_documents()
          print("resource {}".format(resource.short_id))
          for f in ResourceFile.objects.filter(object_id=resource.id):
              if f.has_logical_file and f.logical_file.is_single_file_aggregation:
                  print("  {} is single file aggregation".format(f.short_path))
  
  
  class Command(BaseCommand):
      help = "Print debugging information about logical files."
  
      def add_arguments(self, parser):
  
          # a list of resource id's: none does nothing.
          parser.add_argument('resource_ids', nargs='*', type=str)
  
          # Named (optional) arguments
          parser.add_argument(
              '--log',
              action='store_true',  # True for presence, False for absence
              dest='log',           # value is options['log']
              help='log errors to system log',
          )
  
      def handle(self, *args, **options):
          if len(options['resource_ids']) > 0:  # an array of resource short_id to check.
              for rid in options['resource_ids']:
                  debug_resource(rid)
          else:
              for r in BaseResource.objects.filter(resource_type="CompositeResource"): 
                  debug_resource(r.short_id)
  
              print("No resources to check.")
  
subject: Debug the contents of composite resources after conversion.