jquery - convert to string to array in ruby or javascript to be in used in an SQL query -

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i trying convert string array either in ruby on rails or in javascript or jquery.

in code, values of strings select option. on option selected, capture value returns string 

var lenders = $(this).val();

this string returns. line of id numbers separated commas "15,16,17" , want convert array [15, 16, 17] either in ruby or in javascript.

how achieve this?

i have tried doing 

"15,16,17".split(',')

i have tried doing "15,16,17".to_a

but no avail

"15,16,17".split(',').map(&:to_i) trick


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