Made small improvement to docs/topics/db/multi-db.txt.
@@ -373,8 +373,8 @@ from::
Relations between objects are allowed if both objects are
in the primary/replica pool.
"""
- db_list = ('primary', 'replica1', 'replica2')
- if obj1._state.db in db_list and obj2._state.db in db_list:
+ db_set = {'primary', 'replica1', 'replica2'}
+ if obj1._state.db in db_set and obj2._state.db in db_set:
return True
return None
