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Fixed #35614 -- Prevented SQLCompiler.as_subquery_condition() from mutating a query.

This commit is contained in:
Bendeguz Csirmaz 2024-07-18 18:33:09 +08:00 committed by Sarah Boyce
parent b21f6d7ee4
commit bdd538488c
2 changed files with 12 additions and 4 deletions
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9
django/db/models/sql/compiler.py
View File

@ -1616,14 +1616,15 @@ class SQLCompiler:
def as_subquery_condition(self, alias, columns, compiler):
qn = compiler.quote_name_unless_alias
qn2 = self.connection.ops.quote_name
query = self.query.clone()
for index, select_col in enumerate(self.query.select):
for index, select_col in enumerate(query.select):
lhs_sql, lhs_params = self.compile(select_col)
rhs = "%s.%s" % (qn(alias), qn2(columns[index]))
self.query.where.add(RawSQL("%s = %s" % (lhs_sql, rhs), lhs_params), AND)
query.where.add(RawSQL("%s = %s" % (lhs_sql, rhs), lhs_params), AND)
sql, params = self.as_sql()
return "EXISTS (%s)" % sql, params
sql, params = query.as_sql(compiler, self.connection)
return "EXISTS %s" % sql, params
def explain_query(self):
result = list(self.execute_sql())

7
tests/foreign_object/tests.py
View File

@ -223,6 +223,13 @@ class MultiColumnFKTests(TestCase):
[m2],
)
def test_query_does_not_mutate(self):
"""
Recompiling the same subquery doesn't mutate it.
"""
queryset = Friendship.objects.filter(to_friend__in=Person.objects.all())
self.assertEqual(str(queryset.query), str(queryset.query))
def test_select_related_foreignkey_forward_works(self):
Membership.objects.create(
membership_country=self.usa, person=self.bob, group=self.cia