On Monday, November 2, 2015 at 12:21:53 PM UTC-5, Carlos Cesar Caballero
wrote:
>
> Antony, thanks for your answer, there were some things I did not know you
> could do, but there is just a problem with:
>
> db.define_table('review',
> Field('author'),
> Field('valuea', 'int'),
> Field('valueb', 'int'),
> Field('valuec', 'int'),
> Field('place','reference place'))
>
> def get_review_average(row):
> # all the code...
> # ...
> return value
> db.review.value = Field.Virtual('value', get_review_average),
>
> As you can see in https://github.com/web2py/pydal/issues/304 there is a
> problem setting method and field attributes directly.
>
The above will work, and there is no problem setting virtual field
attributes directly. The problem in the linked issue was only calling a
method field from within a virtual field (and I'm not sure ORMs tend to
have the equivalent of virtual fields anyway, so probably not much of a
limitation, especially given that there are simple workarounds).
One drawback of the above ordering, though, is that it removes the
"laziness" of the table definition (there is a workaround, but not quite as
pretty).
Anthony
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