when the item in the database table commented as {'migrated':1}, guest_list will report out of index error.
This is because the operation self._GuestDbOperator.get_migrated_guest_list() is "SELECT userid FROM guests " , but should be "SELECT * FROM guests ".
when the item in the database table commented as {'migrated':1}, guest_list will report out of index error. erator. get_migrated_ guest_list( ) is "SELECT userid FROM guests " , but should be "SELECT * FROM guests ".
This is because the operation self._GuestDbOp
use "SELECT * FROM guests " will fix this.