[英]How can I create declarative relationship to multiple tables in SQLAlchemy (polimorphic)
[英]How can I query multiple tables relationship in SQLalchemy?
我有這張表有多個表關系
class _FoodsInStock(Base):
__tablename__ = 'FoodsInStock'
date = Column(String, primary_key=True)
breakfasts = relationship('_BreakfastsInStock')
lunch = relationship('_LunchInStock')
snacks = relationship('_SnacksInStock')
cereals = relationship('_CerealsInStock')
fruits = relationship('_FruitsInStock')
cookies = relationship('_CookiesInStock')
chocolates = relationship('_ChocolatesInStock')
others = relationship('_OtherFoodsInStock')
我正在嘗試獲取與_FoodsInStock
表相關的特定表
我知道我可以做這樣簡單的事情:
table = _FoodInStock.query.get(id).breakfasts
這工作得很好,但我需要根據一些輸入來獲得相關的表格,這樣做需要我每行寫下那一行
有什么辦法可以根據輸入使表格相關聯嗎? 像字典里的東西:
tables = ['breakfasts', 'lunch', 'snacks', 'cereals', 'fruits', 'cookies', 'chocolates', 'others']
for table in tables:
q = _FoodInStock.query.get(id)[table]
謝謝!
由於這些是屬性,您應該能夠使用getattr
來實現這一點:
tables = ['breakfasts', 'lunch', 'snacks', 'cereals', 'fruits', 'cookies', 'chocolates', 'others']
for table in tables:
q = getattr(_FoodInStock.query.get(id), table)
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