Ruby - Generate array of comma separated arrays -


i'm trying create google chart using googlevisualr.

this input works:

data_table.add_rows([       ['04/14', 1],         ['04/15', 2],        ['04/16', 3],        ['04/17', 4],        ['04/18', 5],        ['04/19', 1],        ['04/20', 12],        ['04/21', 13],        ['04/24', 14],        ['04/14', 15],        ['04/24', 16],        ['04/22', 17],        ['04/14', 18],        ['04/4', 19],      ])

i using: 

product.find(:all, :order => "created_at asc").each |p|     data_table.add_rows([      [p.created_at.strftime("%m/%d"), p.rating]     ])

which returns:

01/13 2 01/20 3 02/22 2 03/14 2 03/19 2 04/14 1 04/15 2 04/17 2 05/14 2 05/14 2 05/14 2 05/14 2...

how can format array match googlevisualr requires:

[ [data, value], [date, value]...]

no need use loop, use map:

rows = product.all.order("created_at asc").map |p|   [p.created_at.strftime("%m/%d"), p.rating] end data_table.add_rows(rows)

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