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2 changes: 2 additions & 0 deletions sqlalchemy_utils/listeners.py
Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,8 @@ def coercion_listener(mapper, class_):
"""
for prop in mapper.iterate_properties:
try:
if not prop.columns:
continue
listener = prop.columns[0].type.coercion_listener
except AttributeError:
continue
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