Rails core - Aug 2006 - Model.sum returns nil when no rows are selected. Intentional?

Is it intended that the AR sum method return nil rather than 0 (int) or
0.0 (float) when no rows match the conditions? This is the result I get
using MySQL.

I can''t find any mention of this issue in either Trac or the mailing
list archives, so I''ll make up a patch if there''s confirmation
this is
not the desired behaviour.


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