Rails - Oct 2011 - how to do sum of two columns and store in another column in database

Hai friends.......

 My question is I have one table in that three columns a, b and  c..

a=7 and b=10 given input now c value must be store as a+b means 7+10=17.

Please can anybody tell me solution...

Tahnk you.........

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On 11 October 2011 07:35, chand syed
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>
wrote:
> Hai friends.......
>
>  My question is I have one table in that three columns a, b and  c..
>
> a=7 and b=10 given input now c value must be store as a+b means 7+10=17.
Don''t do it, there is no need as you can work it out whenever you need
it.  So do not have a column c in the database, just provide method c
in the model:
def c
  a+b
end

Then you can use your_object.c just as if it were a column in the db.

Colin

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