是否可以分别对多个列进行GROUPBY并使用djangoORM通过其他列聚合它们中的每一个?
我知道如何GROUP BY汇总:
>>> from expenses.models import Expense
>>> from django.db.models import Sum
>>> qs = Expense.objects.order_by().values("is_fixed").annotate(is_fixed_total=Sum("price"))
>>> qs
<ExpenseQueryset [{'is_fixed': False, 'is_fixed_total': Decimal('1121.74000000000')}, {'is_fixed': True, 'is_fixed_total': Decimal('813.880000000000')}]>
但是,如果我想对其他两列做同样的事情,它只返回最后一个:
>>> qs = (
... Expense.objects.order_by()
... .values("is_fixed")
... .annotate(is_fixed_total=Sum("price"))
... .values("source")
... .annotate(source_total=Sum("price"))
... .values("category")
... .annotate(category_total=Sum("price"))
... )
>>> qs
<ExpenseQueryset [{'category': 'FOOD', 'category_total': Decimal('33.9000000000000')}, {'category': 'GIFT', 'category_total': Decimal('628')}, {'category': 'HOUSE', 'category_total': Decimal('813.880000000000')}, {'category': 'OTHER', 'category_total': Decimal('307')}, {'category': 'RECREATION', 'category_total': Decimal('100')}, {'category': 'SUPERMARKET', 'category_total': Decimal('52.8400000000000')}]>
可以只用一个查询而不是三个查询来完成我想要的吗?
预期结果:
<ExpenseQueryset [{'category': 'FOOD', 'total': Decimal('33.9000000000000')}, {... all other categories ...},
{'source': 'MONEY', 'total': Decimal('100')}, {... all other sources ...}, {'is_fixed': False, 'total': Decimal('1121.74000000000')}, {'is_fixed': True, 'total': Decimal('813.880000000000')}]>
最理想的情况是,它可以拆分为以下内容:
<ExpenseQueryset ['categories': [{'category': 'FOOD', 'total': Decimal('33.9000000000000')}, {... all other categories ...}],
'sources': [{'source': 'MONEY', 'total': Decimal('100')}, {... all other sources ...}], 'type': [{'is_fixed': False, 'total': Decimal('1121.74000000000')}, {'is_fixed': True, 'total': Decimal('813.880000000000')}]]>
但这只是一个很大的好处。
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