content: import django.db.models.deletion
  from django.db import migrations, models
  
  
  class Migration(migrations.Migration):
      dependencies = [
          ('core', '0010_gfk_indexes'),
          ('extras', '0110_remove_eventrule_action_parameters'),
      ]
  
      operations = [
          # Custom fields
          migrations.RenameField(
              model_name='customfield',
              old_name='content_types',
              new_name='object_types',
          ),
          migrations.AlterField(
              model_name='customfield',
              name='object_types',
              field=models.ManyToManyField(related_name='custom_fields', to='core.objecttype'),
          ),
          migrations.AlterField(
              model_name='customfield',
              name='object_type',
              field=models.ForeignKey(
                  blank=True, null=True, on_delete=django.db.models.deletion.PROTECT, to='contenttypes.contenttype'
              ),
          ),
          migrations.RunSQL((
              'ALTER TABLE IF EXISTS extras_customfield_content_types_id_seq '
              'RENAME TO extras_customfield_object_types_id_seq'
          )),
          # Pre-v2.10 sequence name (see #15605)
          migrations.RunSQL((
              'ALTER TABLE IF EXISTS extras_customfield_obj_type_id_seq '
              'RENAME TO extras_customfield_object_types_id_seq'
          )),
          # Custom links
          migrations.RenameField(
              model_name='customlink',
              old_name='content_types',
              new_name='object_types',
          ),
          migrations.AlterField(
              model_name='customlink',
              name='object_types',
              field=models.ManyToManyField(related_name='custom_links', to='core.objecttype'),
          ),
          migrations.RunSQL(
              'ALTER TABLE extras_customlink_content_types_id_seq RENAME TO extras_customlink_object_types_id_seq'
          ),
          # Event rules
          migrations.RenameField(
              model_name='eventrule',
              old_name='content_types',
              new_name='object_types',
          ),
          migrations.AlterField(
              model_name='eventrule',
              name='object_types',
              field=models.ManyToManyField(related_name='event_rules', to='core.objecttype'),
          ),
          migrations.RunSQL(
              'ALTER TABLE extras_eventrule_content_types_id_seq RENAME TO extras_eventrule_object_types_id_seq'
          ),
          # Export templates
          migrations.RenameField(
              model_name='exporttemplate',
              old_name='content_types',
              new_name='object_types',
          ),
          migrations.AlterField(
              model_name='exporttemplate',
              name='object_types',
              field=models.ManyToManyField(related_name='export_templates', to='core.objecttype'),
          ),
          migrations.RunSQL(
              'ALTER TABLE extras_exporttemplate_content_types_id_seq RENAME TO extras_exporttemplate_object_types_id_seq'
          ),
          # Saved filters
          migrations.RenameField(
              model_name='savedfilter',
              old_name='content_types',
              new_name='object_types',
          ),
          migrations.AlterField(
              model_name='savedfilter',
              name='object_types',
              field=models.ManyToManyField(related_name='saved_filters', to='core.objecttype'),
          ),
          migrations.RunSQL(
              'ALTER TABLE extras_savedfilter_content_types_id_seq RENAME TO extras_savedfilter_object_types_id_seq'
          ),
          # Image attachments
          migrations.RemoveIndex(
              model_name='imageattachment',
              name='extras_imag_content_94728e_idx',
          ),
          migrations.RenameField(
              model_name='imageattachment',
              old_name='content_type',
              new_name='object_type',
          ),
          migrations.AddIndex(
              model_name='imageattachment',
              index=models.Index(fields=['object_type', 'object_id'], name='extras_imag_object__96bebc_idx'),
          ),
      ]
  