sub-totals in tables

How can I get sub-totalling in tables?

I have an ActiveResource model which gets it's data from a legacy
Windows app via REST. The records are ordered by date. I need to display
subtotals by week number. It looks like I'll have to code something,
which isn't a problem, but this is such a common pattern someone must
have done something before me.

Any clues?

John Small

Can't you simply group them then use the sum rails Enumerable method?

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Have you looked at the group_by method of Enumerable?

"Collect an enumerable into sets, grouped by the result of a block.
Useful, for example, for grouping records by date."