Thanks for the help. I found the solution in this document
https://drive.google.com/file/d/0B1MqW7JZ47SybHNnMFdPWmNQcHc/view?usp=drive_web
where there is a explanation for create a class
On Sunday, 6 December 2015 19:59:20 UTC+1, Anthony wrote:
>
> On Sunday, December 6, 2015 at 9:49:49 AM UTC-5, Alessio Varalta wrote:
>>
>> This solution for me is not good. Ok in this case work but virtual field
>> allows only simple operation on the single filed of a table.
>>
>
> A virtual/method field can be as complex as you want it to be, and it does
> not operate on only a single field of a record. Rather, an entire record is
> passed to it. Furthermore, method fields can take additional arguments and
> of course have access to any global objects as well. Perhaps you are
> confused because the functions of virtual/method fields are often defined
> using lambdas, but you could instead define a separate function using "def"
> and then specify that function in the definition of the virtual field.
>
>
>> I want class with function where i can use cicle and where i can use
>> another dal object..This is present for all frameworks
>> java-ruiby!!!!!!!!!!!!!!! for exmpale
>>
>
> I don't see how you would *need* a class for anything you want to do. You
> could simply create functions and pass the records to the functions (the
> DAL method fields are just a convenient way to attach such functions as
> pseudo-methods of the record). If you want a way to organize a set of
> related functions, you could still create a class and just define a set of
> static methods.
>
> If you want an ORM, you might try the weppy ORM or SQLAlchemy or another
> framework altogether, but the web2py DAL is simply not an ORM and is not
> going to be. Nevertheless, it is not clear why you would need an ORM or
> classes to do what you want to do.
>
>
>> Class Person extend Model
>> string name,
>> int age ecc..
>> function calculateNationOfPerson(id){
>> Nation nation=new Nation('all')
>> return nation.find_nation_of_person(id)
>> }
>> }
>>
>
> I don't know exactly what the above is attempting to do, as the data model
> of nation is not clear (i.e., is "id" the id of the Person record, and if
> so, how does the Nation object use that to find the person's nation?), so I
> won't attempt any web2py code. But in principle, I don't see why you
> couldn't define a similar function and just pass a web2py Row object to it
> (and optionally, attach it as a method via a method field).
>
> Anthony
>
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