old_contents: from django.db.models import signals
  from django.apps import AppConfig
  
  
  class ConstanceConfig(AppConfig):
      name = 'constance'
      verbose_name = 'Constance'
  
      def ready(self):
          super(ConstanceConfig, self).ready()
          signals.post_migrate.connect(self.create_perm,
                                       dispatch_uid='constance.create_perm')
  
      def create_perm(self, using=None, *args, **kwargs):
          """
          Creates a fake content type and permission
          to be able to check for permissions
          """
          from django.conf import settings
          from django.contrib.auth.models import Permission
          from django.contrib.contenttypes.models import ContentType
  
          constance_dbs = getattr(settings, 'CONSTANCE_DBS', None)
          if constance_dbs is not None and using not in constance_dbs:
              return
          if ContentType._meta.installed and Permission._meta.installed:
              content_type, created = ContentType.objects.using(using).get_or_create(
                  app_label='constance',
                  model='config',
              )
  
              permission, created = Permission.objects.using(using).get_or_create(
                  name='Can change config',
                  content_type=content_type,
                  codename='change_config')
  
new_contents: from django.db.models import signals
  from django.apps import AppConfig
  
  
  class ConstanceConfig(AppConfig):
      name = 'constance'
      verbose_name = 'Constance'
  
      def ready(self):
          super(ConstanceConfig, self).ready()
          signals.post_migrate.connect(self.create_perm,
                                       dispatch_uid='constance.create_perm')
  
      def create_perm(self, using=None, *args, **kwargs):
          """
          Creates a fake content type and permission
          to be able to check for permissions
          """
          from django.conf import settings
          from django.contrib.auth.models import Permission
          from django.contrib.contenttypes.models import ContentType
  
          constance_dbs = getattr(settings, 'CONSTANCE_DBS', None)
          if constance_dbs is not None and using not in constance_dbs:
              return
          if ContentType._meta.installed and Permission._meta.installed:
              content_type, created = ContentType.objects.using(using).get_or_create(
                  app_label='constance',
                  model='config',
              )
  
              permission, created = Permission.objects.using(using).get_or_create(
                  content_type=content_type,
                  codename='change_config',
                  defaults={'name': 'Can change config'})
  
subject: fix bug of can't change permission chang_config's name