Hi.

I'm using 2.7.4-stable+timestamp.2013.10.16.09.10.20

In db.py :
db.define_table('table',
    Field('a','double'),
    Field('b','double'),
    Field('c','double', compute=lambda r: r['a']+r['b'])
    )

In appadmin.py:
add record with values a=1, b=2 that right, produce c=3

But In controller: 
def sum():

   sum = db(db.table.id==1).select()
   sum.update_record(a=2)

    print sum ## wrong, that no update computed fields, c is still 3 when 
it should be 4

    message = 'Hello'
    return dict(message=message)

What is wrong?
Thanks.

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