On Saturday, August 5, 2017 at 4:12:43 PM UTC-4, Vic Ding wrote:
> Thanks for the help, it works. However, this alters the table definition. 
> 1) Is there a way that the value is only set temporarily ?

You can set db.customer._format and db.sales_order.customer.requires 
anywhere you want.

> 2) When the address field is empty, can I use other fields , like city, 
> country and etc?

The "_format" attribute and the third argument to IS_IN_DB can be a 
function that takes a row object and returns whatever you want:

def represent_customer(row):
    return something

db.customer._format = represent_customer


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