ROR: Mapping array to get value

Question

I need a small help on ROR.

I have a return from a query and when I do puts result.to_a, I have got:

{"clazz_id"=>1, "staff_id"=>1}
{"clazz_id"=>2, "staff_id"=>1}
{"clazz_id"=>3, "staff_id"=>1}

I have like to convert it to an array of [1, 2, 3] from clazz_id and how can I achieve that?

How did you get this result and how do you intend to use it? Generally speaking this would not be the outcome of a query so a better understanding might result in far better answers. — engineersmnky
– engineersmnky, Commented Feb 8, 2022 at 1:02
@engineersmnky, for now I will just use the the answer provided below. I am very new to ruby. — Daryl Wong
– Daryl Wong, Commented Feb 8, 2022 at 2:30

Talaat Magdy · Accepted Answer · 2022-02-08 00:46:12Z

1

if use Active record query can make this direct pluck

results.pluck(:clazz_id)

if you need deal with array of hash can use map or map! like

p results.to_a.map{|e| e["clazz_id"] }

or can use collect

p results.to_a.collect{|e| e["clazz_id"] }

answered Feb 8, 2022 at 0:46

Talaat Magdy

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