30 lines
1.2 KiB
Python
30 lines
1.2 KiB
Python
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from django.db.models.expressions import OrderByList
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class OrderableAggMixin:
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def __init__(self, *expressions, ordering=(), **extra):
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if isinstance(ordering, (list, tuple)):
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self.order_by = OrderByList(*ordering)
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else:
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self.order_by = OrderByList(ordering)
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super().__init__(*expressions, **extra)
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def resolve_expression(self, *args, **kwargs):
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self.order_by = self.order_by.resolve_expression(*args, **kwargs)
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return super().resolve_expression(*args, **kwargs)
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def get_source_expressions(self):
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if self.order_by.source_expressions:
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return super().get_source_expressions() + [self.order_by]
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return super().get_source_expressions()
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def set_source_expressions(self, exprs):
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if isinstance(exprs[-1], OrderByList):
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*exprs, self.order_by = exprs
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return super().set_source_expressions(exprs)
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def as_sql(self, compiler, connection):
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order_by_sql, order_by_params = compiler.compile(self.order_by)
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sql, sql_params = super().as_sql(compiler, connection, ordering=order_by_sql)
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return sql, (*sql_params, *order_by_params)
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