> When I add code to display the contents 'Shortname: %s' %
> person.short_name
> (even after I have edited the table - which I understand should trigger
> the shortname update)
>
Updating the record will only trigger the compute field update if *all* the
fields needed by the function are included in the updated fields. The
compute function will not fetch non-updated fields from the database in
order to calculate the computed value.
> and for the seond method 'DisplayName: %s' % person.display_name
>
> I get an attribute error...
>
> Traceback (most recent call last):
> File "/home/peter/web2py/gluon/restricted.py", line 227, in restricted
> exec ccode in environment
> File
> "/home/peter/web2py/applications/PAPILLON_AIM/controllers/default.py", line
> 2256, in <module>
> File "/home/peter/web2py/gluon/globals.py", line 417, in <lambda>
> self._caller = lambda f: f()
> File "/home/peter/web2py/gluon/tools.py", line 4241, in f
> return action(*a, **b)
> File
> "/home/peter/web2py/applications/PAPILLON_AIM/controllers/default.py", line
> 305, in view_person
> 'DisplayName: %s' % person.display_name
> File "/home/peter/web2py/gluon/packages/dal/pydal/objects.py", line 90,
> in __getattr__
> raise AttributeError
> AttributeError
>
When defining a virtual field, inside the function, you must use
row.tablename.fieldname to refer to each field, not just row.fieldname.
As an aside, why not change the get_user_short_name function to take a
single row object rather than each of the individual field values? That
way, instead of having to do:
Field.Virtual('display_name', lambda row: get_user_short_name(...))
you can simply do:
Field.Virtual('display_name', get_user_short_name)
In other words, as long as you are creating a function solely for this
purpose, just give it the signature it needs without having to wrap it in a
lambda.
Anthony
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