On Mar 9, 10:47 pm, partydrone <[email protected]> wrote:
> I want to pull data from the database once, but do multiple sorts on
> different columns.
>
> I'm pulling a list of products from the database. In my view, I want
> to create two select lists: one sorted by the product name; one sorted
> by part number. I know I can map the values into a new array or use
> "options_from_collection_for_select," but I'm having a little trouble
> with sorting.
>
> >> products.map { |p| [p.id, p.name] }.sort
sort takes a block - you can make it compare anyway you want with that
block, eg [1,2,3].sort {|x,y| x <=> y} is the same as [1,2,3] but
[1,2,3].sort {|x,y| y <=> x } would sort in opposite order and
[1,2,3,4,5,6,7,8].sort {|x,y| (x%5) <=> (y%5)} sorts according to
residue mod 5.
Fred
>
> => [[7, "DataCollector"], [8, "DataTranslator"], [9, "DataMonitor"],
> [10, "DataExpress"], [11, "DataView"]]
>
> The "sort" command sorts by the first item in each array, as can be
> seen by switching the values:
>
> >> products.map { |p| [p.name, p.id] }.sort
>
> => [["DataCollector", 7], ["DataExpress", 10], ["DataMonitor", 9],
> ["DataTranslator", 8], ["DataView", 11]]
>
> So, how do I get the sort order I want from the second example, but
> keep the structure from the first example so the select list will
> display correctly?
>
> Thanks.
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