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-rw-r--r--lib/sqlalchemy/orm/descriptor_props.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/sqlalchemy/orm/descriptor_props.py b/lib/sqlalchemy/orm/descriptor_props.py
index f43952279..6385d40e2 100644
--- a/lib/sqlalchemy/orm/descriptor_props.py
+++ b/lib/sqlalchemy/orm/descriptor_props.py
@@ -360,6 +360,8 @@ class SynonymProperty(DescriptorProperty):
if self.comparator_factory:
comp = self.comparator_factory(prop, mapper)
+ elif isinstance(prop, DescriptorProperty):
+ comp = prop._comparator_factory(mapper)
else:
comp = prop.comparator_factory(prop, mapper)
return comp