text: from django.db import models
  from south.db import DEFAULT_DB_ALIAS
  
  # If we detect Django 1.7 or higher, then exit
  # Placed here so it's guaranteed to be imported on Django start
  import django
  if django.VERSION[0] > 1 or (django.VERSION[0] == 1 and django.VERSION[1] > 6):
      raise RuntimeError(
          "South does not support Django 1.7 or higher. Please use native Django migrations.")
  
  
  class MigrationHistory(models.Model):
      app_name = models.CharField(max_length=255)
      migration = models.CharField(max_length=255)
      applied = models.DateTimeField(blank=True)
  
      @classmethod
      def for_migration(cls, migration, database):
          try:
              # Switch on multi-db-ness
              if database != DEFAULT_DB_ALIAS:
                  # Django 1.2
                  objects = cls.objects.using(database)
              else:
                  # Django <= 1.1
                  objects = cls.objects
              return objects.get(
                  app_name=migration.app_label(),
                  migration=migration.name(),
              )
          except cls.DoesNotExist:
              return cls(
                  app_name=migration.app_label(),
                  migration=migration.name(),
              )
  
      def get_migrations(self):
          from south.migration.base import Migrations
          return Migrations(self.app_name)
  
      def get_migration(self):
          return self.get_migrations().migration(self.migration)
  
      def __str__(self):
          return "<%s: %s>" % (self.app_name, self.migration)
  