Don't initialize PostGIS-specific stuff for non-db connections

from django.db.backends.creation import NO_DB_ALIAS

from django.db.backends.postgresql_psycopg2.base import DatabaseWrapper as Psycopg2DatabaseWrapper

from django.contrib.gis.db.backends.postgis.creation import PostGISCreation

from django.contrib.gis.db.backends.postgis.introspection import PostGISIntrospection

class DatabaseWrapper(Psycopg2DatabaseWrapper):

    def __init__(self, *args, **kwargs):

        super(DatabaseWrapper, self).__init__(*args, **kwargs)

        if kwargs.get('alias', '') != NO_DB_ALIAS:

            self.creation = PostGISCreation(self)

            self.ops = PostGISOperations(self)

            self.introspection = PostGISIntrospection(self)

# The prefix to put on the default database name when creating

# the test database.

TEST_DATABASE_PREFIX = 'test_'

NO_DB_ALIAS = '__no_db__'

class BaseDatabaseCreation(object):

        backend = load_backend(settings_dict['ENGINE'])

        nodb_connection = backend.DatabaseWrapper(

             settings_dict,

             alias='__no_db__',

             alias=NO_DB_ALIAS,

             allow_thread_sharing=False)

        return nodb_connection