(Ruby) how to insert a pair into an array

Question

I have a 2D array that is to have the name and slug of each school in a database, as pairs. I want to start this array off empty and then add each school one-by-one to it.

This is what I have tried:

<% schoolSelect = [] %>
<% @schools.each { |x| schoolSelect += [x.name, x.slug] } %>

However, this adds the name and slug of a school into the array in session, instead of two-dimensional.

what is inside the @schools and what you want in output plz tell — Tushar Pal
– Tushar Pal, Commented Jul 4, 2016 at 15:23
You are still using the code snippet instead of normal code block. Please stop using it unless you have a runnable exemple to show. — Marc-Andre
– Marc-Andre, Commented Jul 4, 2016 at 15:23
Why do you want to do that? It feels to me like you are going to use that array in a select? If that is the case there might be better solutions, since there are quite clever form builder methods. — spickermann
– spickermann, Commented Jul 4, 2016 at 15:24
@Marc-Andre apologies, edited above, let me know if it's correct now. — keyan.r
– keyan.r, Commented Jul 4, 2016 at 15:26
@keyan.r It's correct, thank you for modifying it. It take less space in your question now. — Marc-Andre
– Marc-Andre, Commented Jul 4, 2016 at 15:27

spickermann · Accepted Answer · 2016-07-04 15:27:59Z

3

Use << instead of +=:

schoolSelect = []
@schools.each { |x| schoolSelect << [x.name, x.slug] }

Or even better use the Ruby idiom map:

schoolSelect = @schools.map { |s| [s.name, s.slug] }

This works, because map already returns an array.

edited Jul 4, 2016 at 15:27

answered Jul 4, 2016 at 15:21

spickermann

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