migration error "geo_db_type" when using postgres as second database for geodjango

Hi, 

I use mysql as default database and postgres for geodjango related appliction.  

    

my settings:

DATABASE_ROUTERS = ['world.routers.GisRouter',

                    'rest_shop.routers.ShopRouter',

                    'rest_client.routers.ClientRouter']

DATABASES = {

    'default': {

        'ENGINE': 'django.db.backends.mysql',

        'NAME': 'fddd',

        'USER': ******,

        'PASSWORD': ******,

        'HOST': SERVER_HOST,

        'PORT': '3306',

    },

    'geodjango': {

        'ENGINE': 'django.contrib.gis.db.backends.postgis',

        'NAME': 'geo',

        'USER': *****,

        'PASSWORD': *******,

        'HOST': SERVER_HOST,

    }

}

during migration, error raised:

Traceback (most recent call last):

  File "C:\Program Files (x86)\JetBrains\PyCharm 4.5.4\helpers\pycharm\django_manage.py", line 41, in <module>

    run_module(manage_file, None, '__main__', True)

  File "C:\Python27\lib\runpy.py", line 176, in run_module

    fname, loader, pkg_name)

  File "C:\Python27\lib\runpy.py", line 82, in _run_module_code

    mod_name, mod_fname, mod_loader, pkg_name)

  File "C:\Python27\lib\runpy.py", line 72, in _run_code

    exec code in run_globals

  File "D:\src\fddd_backend\manage.py", line 10, in <module>

    execute_from_command_line(sys.argv)

  File "C:\Python27\lib\site-packages\django-1.8.4-py2.7.egg\django\core\management\__init__.py", line 338, in execute_from_command_line

    utility.execute()

  File "C:\Python27\lib\site-packages\django-1.8.4-py2.7.egg\django\core\management\__init__.py", line 330, in execute

    self.fetch_command(subcommand).run_from_argv(self.argv)

  File "C:\Python27\lib\site-packages\django-1.8.4-py2.7.egg\django\core\management\base.py", line 393, in run_from_argv

    self.execute(*args, **cmd_options)

  File "C:\Python27\lib\site-packages\django-1.8.4-py2.7.egg\django\core\management\base.py", line 443, in execute

    self.check()

  File "C:\Python27\lib\site-packages\django-1.8.4-py2.7.egg\django\core\management\base.py", line 481, in check

    include_deployment_checks=include_deployment_checks,

  File "C:\Python27\lib\site-packages\django-1.8.4-py2.7.egg\django\core\checks\registry.py", line 72, in run_checks

    new_errors = check(app_configs=app_configs)

  File "C:\Python27\lib\site-packages\django-1.8.4-py2.7.egg\django\core\checks\model_checks.py", line 28, in check_all_models

    errors.extend(model.check(**kwargs))

  File "C:\Python27\lib\site-packages\django-1.8.4-py2.7.egg\django\db\models\base.py", line 1205, in check

    errors.extend(cls._check_fields(**kwargs))

  File "C:\Python27\lib\site-packages\django-1.8.4-py2.7.egg\django\db\models\base.py", line 1282, in _check_fields

    errors.extend(field.check(**kwargs))

  File "C:\Python27\lib\site-packages\django-1.8.4-py2.7.egg\django\db\models\fields\__init__.py", line 207, in check

    errors.extend(self._check_backend_specific_checks(**kwargs))

  File "C:\Python27\lib\site-packages\django-1.8.4-py2.7.egg\django\db\models\fields\__init__.py", line 306, in _check_backend_specific_checks

    return connection.validation.check_field(self, **kwargs)

  File "C:\Python27\lib\site-packages\django-1.8.4-py2.7.egg\django\db\backends\mysql\validation.py", line 18, in check_field

    field_type = field.db_type(connection)

  File "C:\Python27\lib\site-packages\django-1.8.4-py2.7.egg\django\contrib\gis\db\models\fields.py", line 247, in db_type

    return connection.ops.geo_db_type(self)

AttributeError: 'DatabaseOperations' object has no attribute 'geo_db_type'

Is there something wrong with my settings?

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