text: import os
  
  from io import StringIO
  
  from django.core.management import call_command
  from django.core.serializers import base, python
  
  
  class MigrationLoadFixture:
  
      def __init__(self, migration_file, fixture_dir=None, fixture_filename=None, fixture_type='json'):
          self.migration_file = migration_file
          self.fixture_dir = fixture_dir or os.path.abspath(os.path.join(os.path.dirname(migration_file), 'fixtures'))
          self.fixture_filename = fixture_filename or '%s.%s' % (
              os.path.basename(migration_file).rsplit('.', 1)[0], fixture_type
          )
  
      def __call__(self, apps, schema_editor):
          def _get_model(model_identifier):
              """
              Helper to look up a model from an "app_label.model_name" string.
              """
              try:
                  return apps.get_model(model_identifier)
              except (LookupError, TypeError):
                  raise base.DeserializationError("Invalid model identifier: '%s'" % model_identifier)
  
          get_model_tmp = python._get_model  # pylint: disable=W0212
          python._get_model = _get_model
          file = os.path.join(self.fixture_dir, self.fixture_filename)
          if not os.path.isfile(file):
              raise IOError('File "%s" does not exists' % file)
          call_command('loaddata', file, stdout=StringIO())
          python._get_model = get_model_tmp  # pylint: disable=W0212
  