def connect(self): 
        try:
            self.connection = pymongo.Connection(self.host, self.port)
            self.db = self.connection[self.name]
        except AutoReconnect:
            raise DatabaseException("It's not possible connect to the database")
def abs(self, f):
        """Convert a repo path back to path that is relative to the root of the
        matcher."""
        return f