code: def dump_json(model, batch_len=200000, use_natural_keys=True, verbosity=1):
      
      model = get_model(model)
  
      N = model.objects.count()
  
      if verbosity > 0:
          widgets = [pb.Counter(), '/%d rows: ' % (N,), pb.Percentage(), ' ', pb.RotatingMarker(), ' ', pb.Bar(),' ', pb.ETA()]
          i, pbar = 0, pb.ProgressBar(widgets=widgets, maxval=N).start()
  
      JSONSerializer = serializers.get_serializer("json")
      jser = JSONSerializer()
  
      if verbosity > 0:
          pbar.update(0)
      for i, partial_qs in enumerate(util.generate_slices(model.objects.all(), batch_len=batch_len)):
          with open(model._meta.app_label.lower() + '--' + model._meta.object_name.lower() + '--%04d.json' % i, 'w') as fpout:
              if verbosity > 0:
                  pbar.update(i*batch_len)
              jser.serialize(partial_qs, indent=1, stream=fpout, use_natural_keys=use_natural_keys)
      if verbosity > 0:
          pbar.finish()
docs: Dump database records to .json Django fixture file, one file for each batch of `batch_len` records
  
      Files are suitable for loading with "python manage.py loaddata folder_name_containing_files/*".