Good point.
On Saturday, February 23, 2013 12:48:04 PM UTC-5, Niphlod wrote:
>
> While update()ing fields are translated to column names, so you don't have
> to fetch the record just to increment it.
>
> >>>db.define_table('myupdates', Field('quantity', 'integer'))
> >>>db(db.myupdates.id == 1)._update(quantity=db.myupdates.quantity + 1)
> 'UPDATE myupda SET quantity=(myupda.quantity + 1) WHERE (myupda.id = 1);'
>
>
> That piece of code (updating the product) is correct.
>
> On Saturday, February 23, 2013 5:22:04 PM UTC+1, Anthony wrote:
>>
>> db(db.product.id==key).update(quantity=db.product.quantity -
>>> value)
>>
>>
>> Here you probably want:
>>
>> db(db.product.id==key).update(quantity=db.product(key).quantity -value
>> )
>>
>> db.product.quantity is a Field object, but you want to get the value of
>> that field for the particular record, which is db.product(key).quantity.
>>
>> Anthony
>>
>
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