[Rails] Re: Re: Calculate methods on attr_accessor objects

[François Montel]

Ah of course, I figured there was a simple Rails way but hadn't found 
it. Why didn't I try that? :-)

The kind of thing that would be handy to add to the documentation.

By the way, there used to be annotated documentation at 
rails.outertrack.com but it's down these days. Has it moved elsewhere? I 
could add a comment on this to it.

Rick Olson wrote:
>> Item.count_by_sql("select sum(cost_unit * amount) from items")
> 
> Item.sum 'cost_unit * amount'


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