content: from django.db import migrations, models
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ('contenttypes', '0002_remove_content_type_name'),
          ('extras', '0126_exporttemplate_file_name'),
          ('ipam', '0080_populate_service_parent'),
      ]
  
      operations = [
          migrations.RemoveField(
              model_name='service',
              name='device',
          ),
          migrations.RemoveField(
              model_name='service',
              name='virtual_machine',
          ),
          migrations.AlterField(
              model_name='service',
              name='parent_object_id',
              field=models.PositiveBigIntegerField(),
          ),
          migrations.AlterField(
              model_name='service',
              name='parent_object_type',
              field=models.ForeignKey(
                  on_delete=models.deletion.PROTECT, related_name='+', to='contenttypes.contenttype'
              ),
          ),
          migrations.AddIndex(
              model_name='service',
              index=models.Index(
                  fields=['parent_object_type', 'parent_object_id'], name='ipam_servic_parent__563d2b_idx'
              ),
          ),
      ]
  
  
  def oc_service_remove_fields(objectchange, reverting):
      for data in (objectchange.prechange_data, objectchange.postchange_data):
          if data is not None:
              data.pop('device', None)
              data.pop('virtual_machine', None)
  
  
  objectchange_migrators = {
      'ipam.service': oc_service_remove_fields,
  }
  