def METHOD_NAME(self):
    """
    connect to mongo
    Standard URI format: mongodb://[dbuser:dbpassword@]host:port/dbname
    """
    self.mongo_uri = "mongodb://%s:%s/%s" % (self.host, self.port, self.database_name)
    try:
        self.client = pymongo.MongoClient(self.mongo_uri)
        self.current_database = self.client.get_default_database()
        if self.collection_name != u'':
            self.current_collection = self.current_database[self.collection_name]
        else:
            return " WARN - the collection has not been selected..."
    except Exception, e:
         assert False, " ERROR - Connecting to MongoDB...\n %s " % (str(e))