Also, note that virtual fields (both the old style you have shown below and
the new style Field.Virtual) are designed to calculate values based on
other fields in the record. This happens at the time the records from the
database are parsed into a Rows object, so you cannot use these for
updating records by calling them at some later point. Instead, for this
purpose, you would have to use Field.Method, or if you want to use the old
style virtual fields, you would have to define the methods as "lazy" (as
described in the documentation). Field.Method and lazy virtual fields were
not really designed with this use in mind, but I suppose they can be used
this way. Here's an example:
db.define_table('mytable',
...,
Field.Method('change_name', lambda r, nome: r.mytable.update_record(nome
=nome)))
db.mytable(1).change_name(nome='Alessio')
Anyway, there are other ways to handle such things without resorting to
virtual fields or classes -- for example, just writing simple functions.
Anthony
On Saturday, December 5, 2015 at 5:24:28 PM UTC-5, Anthony wrote:
>
> On Saturday, December 5, 2015 at 11:37:01 AM UTC-5, Alessio Varalta wrote:
>>
>> Hi, I have a problem..I have controller with too much code..So I want to
>> use the logic of Java or Ruby. Have a class that represent the object of my
>> database and implement function in this class and use this class in the
>> Controller. The problem is that I try the VirtualField a part of web2py
>> guide
>>
>> in db file I create
>> class Layer_scheda(object):
>> def change_name(self,nome):
>> self.nome=nome
>> self.update.update_record()
>>
>
> It would just be self.update_record(), not self.update.update_record().
>
>
>> after in my Controller i try
>>
>> order_item.change_name
>> or order_item.change_name() but I have problem change_name is not
>> defined
>>
>
> What is order_item?
>
> Anthony
>
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