54 lines
1.3 KiB
Python
54 lines
1.3 KiB
Python
from models import User, Location, Order, OrderItem, Product
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from sqlalchemy.sql import func, desc
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class FatModel:
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@classmethod
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def all(cls):
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return cls.query.all()
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@classmethod
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def amount(cls):
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return cls.query.count()
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class FatLocation(Location, FatModel): pass
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class FatOrder(Order, FatModel):
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# It's hard to add the unique user constraint,
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# as DISTINCT seems to apply after a GROUP BY and aggregate
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# So DISTINCT ... count(user_id) ... will count all users,
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# even if they get reduced by the disctinct afterwards.
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@classmethod
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def items_per_order(cls):
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return Order.query.\
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join(OrderItem).\
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group_by(Order.id).\
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with_entities(Order.id, func.count(OrderItem.user_id).label('total'))
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class FatUser(User, FatModel): pass
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class FatOrderItem(OrderItem, FatModel): pass
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class FatProduct(Product, FatModel):
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@classmethod
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def top4(cls):
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top4 = OrderItem.query\
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.join(Product)\
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.join(Location)\
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.group_by(Product.id)\
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.with_entities(Product.name,
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Location.name,
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func.count(Product.id).label('count')
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)\
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.order_by(desc('count'))\
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.limit(4)
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for top in top4:
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print(top) |