This is my model code, its basically what you did: I am getting this error
*<type 'exceptions.SyntaxError'> invalid table "fuelLogging" attributes:
set(['before_update'])*
*MODEL CODE*
def fuelLogging_before_update(*args, **kwargs):
db.fuelLogging.compute = lambda r: (db.fuelLogging.ODO_Reading * -1) + r
.ODO_Reading
db.define_table('fuelLogging',
Field('Quantity', 'integer', requires=IS_NOT_EMPTY()),
Field('Rate', 'integer', requires=IS_NOT_EMPTY()),
Field('Total', compute=lambda r:r['Quantity']*r['Rate']),
Field('ODO_Reading', 'integer', requires=IS_NOT_EMPTY()),
Field('Fuel_Usage', compute=lambda r: r['Delta']/r[
'Quantity']),
Field('Delta', default=0),
before_update=fuelLogging_before_update)
I guess i am doing something wrong somewhere!
On Monday, January 14, 2019 at 11:37:10 PM UTC+2, Anthony wrote:
>
> On Monday, January 14, 2019 at 2:23:32 AM UTC-5, mostwanted wrote:
>>
>> I am trying your formula but my Delta field is not getting updated. It is
>> supposed to change as i enter a different value in ODO_Reading.
>>
>
> Please show your exact code. Note, if you are using .update_record, the
> Row returned by that method will not contain the updated Delta value, as
> that value is calculated in the database. To get the updated value, you
> would need to fetch the record from the database.
>
> Anthony
>
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