SQLAlchemy 是否有相當於 Django 的 get_or_create?

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如果它已經存在(基於提供的參數),我想從數據庫中獲取一個對象,如果它不存在,我想創建它。

Django"s get_or_create(或 source) 這樣做。SQLAlchemy 中是否有等效的快捷方式?

我目前正在像這樣明確地寫出來:

def get_or_create_instrument(session, serial_number): instrument = session.query(Instrument).filter_by(serial_number=serial_number)。 first() if instrument: return instrument else: instrument = Instrument(serial_number) session.add(instrument) return instrument 

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