Field('edits', 'integer', default=0, update=(lambda r: (r['edits'] or 0) +
1 ), writable=False)
On Saturday, 18 January 2014 21:27:06 UTC-6, Jaime Sempere wrote:
>
>
> I'm trying to automatically count each time a record is being updated. I
>> could make a lambda function that worked for a dictionary:
>> Field('edits', 'integer', compute=lambda r: int(r['edits'] or 0) + 1 ),
>>
>> However, I don't get this to work in practice. Can a lambda for edits not
>> use its own value?
>>
>
> I think you are right in that point, from book:
>
>
> - compute is an optional function. If a record is inserted or updated,
> the compute function will be executed and the field will be populated with
> the function result. The record is passed to the compute function as a
> dict, and *the dict will not include the current value of that, or any
> other compute field.*
>
>
> I think you will need to look for another solution.
>
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