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