Hi,
I think you'd better reference your store_registration table once by id in
the temperature table.
Field('store_registration_id', 'reference store_registration', writable=
False),
In that way you comply with the rule of single_point-of_definition. The way
you define your temperatures
table, when a user updates his contact_number it has to cascade to the
temperatures table.
What you want can be achieved by 'reference store_registration' you could
remove the reference and
replace it with an IS_IN_DB() validator for instance for Cell_No:
IS_IN_DB(db, 'store_registration.contact_number', '%(contact_number)s')
and then write your own ON UPDATE CACADE functions
Kind regards,
Annet
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