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This commit is contained in:
collerek
2021-03-07 16:53:38 +01:00
parent 037fc418a4
commit 9c46383130
1 changed files with 17 additions and 12 deletions
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29
ormar/queryset/query.py
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@ -172,26 +172,31 @@ class Query:
pk_alias = self.model_cls.get_column_alias(self.model_cls.Meta.pkname)
pk_aliased_name = f"{self.table.name}.{pk_alias}"
qry_text = sqlalchemy.text(f"{pk_aliased_name} as limit_column")
# maxes = dict()
# for order in list(self.sorted_orders.keys()):
# if order is not None and order.get_field_name_text() != pk_aliased_name:
# aliased_col = order.get_field_name_text()
# maxes[aliased_col] = sqlalchemy.text(aliased_col)
maxes = dict()
for ind, order in enumerate(list(self.sorted_orders.keys())):
if order is not None and order.get_field_name_text() != pk_aliased_name:
aliased_col = order.get_field_name_text()
maxes[aliased_col] = sqlalchemy.text(f"{aliased_col} as col{ind}")
limit_qry = sqlalchemy.sql.select([qry_text])
limit_qry = sqlalchemy.sql.select([qry_text] + list(maxes.values()))
limit_qry = limit_qry.select_from(self.select_from)
limit_qry = self._apply_expression_modifiers(limit_qry)
limit_qry = FilterQuery(filter_clauses=self.filter_clauses).apply(limit_qry)
limit_qry = FilterQuery(filter_clauses=self.exclude_clauses,
exclude=True).apply(limit_qry)
limit_qry = limit_qry.group_by(sqlalchemy.text(f"{pk_aliased_name}"))
exclude=True).apply(
limit_qry
)
limit_qry = OrderQuery(sorted_orders=self.sorted_orders).apply(limit_qry)
limit_qry = LimitQuery(limit_count=self.limit_count).apply(limit_qry)
limit_qry = OffsetQuery(query_offset=self.query_offset).apply(limit_qry)
limit_qry = limit_qry.alias("limit_query")
limit_qry = limit_qry.alias("inner_limit_query")
outer_text = sqlalchemy.text(f"distinct limit_column")
outer_qry = sqlalchemy.sql.select([outer_text])
outer_qry = outer_qry.select_from(limit_qry)
outer_qry = LimitQuery(limit_count=self.limit_count).apply(outer_qry)
outer_qry = OffsetQuery(query_offset=self.query_offset).apply(outer_qry)
outer_qry = outer_qry.alias("limit_query")
on_clause = sqlalchemy.text(
f"limit_query.limit_column={self.table.name}.{pk_alias}")
return limit_qry, on_clause
return outer_qry, on_clause
def _apply_expression_modifiers(
self, expr: sqlalchemy.sql.select