[web2py] Table field: compute with 'id' ?

[dederocks]

Hello,

I am trying to generate a field with a default value based on the
record id -- but it doesn't work. For example:

db.define_table('article',
    Field('designation', type='string', length=200, required=True,
requires=IS_NOT_EMPTY()),
    Field('details', type='string', length=2000),
    Field('intcodebarre', type='string', length=50, compute=lambda r:
"SolA%-.6d" % r['id']),
    format='%(designation)s')

Is not accepted (but works for a declared field). For a future patch
or bad design on my side?

BR, Andre