AttributeError: 'DatabaseWrapper' object has no attribute 'Database' about django-firebird HOT 6 CLOSED

# In router.py
class DatabaseRouter(object):

    def db_for_read(self, model, **hints):
        return 'legacy' if model._meta.app_label == 'legacy' else 'default'

    def db_for_write(self, model, **hints):
        return 'legacy' if model._meta.app_label == 'legacy' else 'default'

    def allow_relation(self, obj1, obj2, **hints):
        return None

    def allow_migrate(self, db, model):
        return None

# In settings.py
DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql_psycopg2',
        'NAME': '...',
        'USER': '...',
        'PASSWORD': '...',
        'HOST': '...',
        'PORT': '...'
    },
    'legacy': {
        'ENGINE': 'firebird',
        'NAME': '...',
        'USER': 'SYSDBA',
        'PASSWORD': 'masterkey',
        'HOST': 'localhost',
        'PORT': '3050',
        # 'OPTIONS': {'charset': 'ISO8859_1'},
    }
}

DATABASE_ROUTERS = ['...router.DatabaseRouter',]

>>> from django.db import connections
>>> c = connections['legacy'].cursor() # <= 'legacy' is the firebird db in settings.DATABASES
>>> c.execute('select 1')
/usr/local/lib/python2.7/dist-packages/django/db/backends/util.pyc in execute(self, sql, params)
     67         start = time()
     68         try:
---> 69             return super(CursorDebugWrapper, self).execute(sql, params)
     70         finally:
     71             stop = time()

/usr/local/lib/python2.7/dist-packages/django/db/backends/util.pyc in execute(self, sql, params)
     51                 return self.cursor.execute(sql)
     52             else:
---> 53                 return self.cursor.execute(sql, params)
     54 
     55     def executemany(self, sql, param_list):

/usr/local/lib/python2.7/dist-packages/django/db/utils.pyc in __exit__(self, exc_type, exc_value, traceback)
     84                 Error,
     85             ):
---> 86             db_exc_type = getattr(self.wrapper.Database, dj_exc_type.__name__)
     87             if issubclass(exc_type, db_exc_type):
     88                 # Under Python 2.6, exc_value can still be a string.


AttributeError: 'DatabaseWrapper' object has no attribute 'Database'

>>> Equipment.objects.count()

/usr/local/lib/python2.7/dist-packages/django/db/models/manager.pyc in count(self)
    134 
    135     def count(self):
--> 136         return self.get_queryset().count()
    137 
    138     def dates(self, *args, **kwargs):

/usr/local/lib/python2.7/dist-packages/django/db/models/query.pyc in count(self)
    289             return len(self._result_cache)
    290 
--> 291         return self.query.get_count(using=self.db)
    292 
    293     def get(self, *args, **kwargs):

/usr/local/lib/python2.7/dist-packages/django/db/models/sql/query.pyc in get_count(self, using)
    388 
    389         obj.add_count_column()
--> 390         number = obj.get_aggregation(using=using)[None]
    391 
    392         # Apply offset and limit constraints manually, since using LIMIT/OFFSET


/usr/local/lib/python2.7/dist-packages/django/db/models/sql/query.pyc in get_aggregation(self, using)
    354         query.related_select_cols = []
    355 
--> 356         result = query.get_compiler(using).execute_sql(SINGLE)
    357         if result is None:
    358             result = [None for q in query.aggregate_select.items()]

/usr/local/lib/python2.7/dist-packages/django/db/models/sql/compiler.pyc in execute_sql(self, result_type)
    779                 return
    780 
--> 781         cursor = self.connection.cursor()
    782         cursor.execute(sql, params)
    783 

/usr/local/lib/python2.7/dist-packages/django/db/backends/__init__.pyc in cursor(self)
    155         if (self.use_debug_cursor or
    156             (self.use_debug_cursor is None and settings.DEBUG)):
--> 157             cursor = self.make_debug_cursor(self._cursor())
    158         else:
    159             cursor = util.CursorWrapper(self._cursor(), self)

/usr/local/lib/python2.7/dist-packages/firebird/base.pyc in _cursor(self)
    112             self._db_charset = conn_params.get('charset')
    113             self.encoding = charset_map.get(self._db_charset, 'utf_8')
--> 114             self.connection = Database.connect(**conn_params)
    115             connection_created.send(sender=self.__class__)
    116 

/usr/local/lib/python2.7/dist-packages/fdb/fbcore.pyc in connect(dsn, user, password, host, port, database, sql_dialect, role, charset, buffers, force_write, no_reserve, db_key_scope, isolation_level, connection_class)
    643        con = fdb.connect(host='myhost', database='/path/database.fdb', user='sysdba', password='pass', charset='UTF8')
    644     """
--> 645     load_api()
    646     if connection_class == None:
    647         connection_class = Connection

/usr/local/lib/python2.7/dist-packages/fdb/fbcore.pyc in load_api()
    174 def load_api():
    175     if not api:
--> 176         setattr(sys.modules[__name__],'api',fbclient_API())
    177     return api
    178 

/usr/local/lib/python2.7/dist-packages/fdb/ibase.pyc in __init__(self)
   1153     def __init__(self):
   1154 
-> 1155         self.isc_attach_database = fb_library.isc_attach_database
   1156         self.isc_attach_database.restype = ISC_STATUS
   1157         self.isc_attach_database.argtypes = [POINTER(ISC_STATUS), c_short, STRING,

/usr/lib/python2.7/ctypes/__init__.pyc in __getattr__(self, name)
    376         if name.startswith('__') and name.endswith('__'):
    377             raise AttributeError(name)
--> 378         func = self.__getitem__(name)
    379         setattr(self, name, func)
    380         return func

/usr/lib/python2.7/ctypes/__init__.pyc in __getitem__(self, name_or_ordinal)
    381 
    382     def __getitem__(self, name_or_ordinal):
--> 383         func = self._FuncPtr((name_or_ordinal, self))
    384         if not isinstance(name_or_ordinal, (int, long)):
    385             func.__name__ = name_or_ordinal

AttributeError: python: undefined symbol: isc_attach_database