[web2py] Re: built-in lazy virtual fields

[Carlos]

Hi Massimo,

So far this is great !

But, while we're on the lazy fields topic, can you implement the following 
specialized VirtualCommand (maybe named Virtual*Row*Command)?:

    class VirtualRowCommand(object):
        def __init__(self, method, row):
            self.method = method
            if len(row) != 1:
                a + b # raise an error.
            self.row = *row.values()[0]*
        def __call__(self, *args, **kwargs):
            return self.method(self.row, *args, **kwargs)

In my case, all my rows are a single item (whith is the table name), so it 
would be much better and simpler to use 'self' for the direct row (see 
"row.values()[0]" above).

This way I can use virtual fields as follow:

    class VirtualTest(object):
        def x_id(vv, self):
            return *self*.id

Note that 'vv' (or any other name) is the VirtualTest instance (which I 
don't really care about), and 'self' is the actual specific row.

Can you please consider this approach or something similar that accomplishes 
the same thing?.

Thanks!,

   Carlos