How to get hash from array of hashes using a find?

Question

I have a hash set in my code that declares an elegibility scale:

eligibility_scale = [{family_size: 2, minimum_income: 20161, maximum_income: 38200},
                     {family_size: 3, minimum_income: 25393, maximum_income: 43000},
                     {family_size: 4, minimum_income: 30613, maximum_income: 47750},
                     {family_size: 5, minimum_income: 35845, maximum_income: 51600},
                     {family_size: 6, minimum_income: 41065, maximum_income: 55400},
                     {family_size: 7, minimum_income: 46297, maximum_income: 59250},
                     {family_size: 8, minimum_income: 51517, maximum_income: 63050}]

I'm trying to get the hash result using the family_size as the search parameter.

income_bracket = eligibility_scale.select{|h| h["family_size"] == 4 }
# Expecting: {family_size: 4, minimum_income: 30613, maximum_income: 47750}

After running this code I'm getting an empty array.

Any suggestions on what I'm doing wrong?

falsetru · Accepted Answer · 2014-05-30 13:15:25Z

2

Hash keys in the question are symbols, not strings.

You need to specify the key as symbol:

Replace following:

h["family_size"]

with:

h[:family_size]

answered May 30, 2014 at 13:15

falsetru

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Cereal · Accepted Answer · 2014-05-30 13:52:22Z

1

Using select will return an array, first of all, so if your family_size is unique, you can just use find. Otherwise, use select in the same way, but expect to have an array of hashes returned.

Second of all, your hashes are using symbols, not string. Ideally, you're looking at writing something like this:

eligibility_scale.find { |i| i[:family_size] == 4 }
# => {family_size: 4, minimum_income: 30613, maximum_income: 47750}

This is assuming your family size is unique.

answered May 30, 2014 at 13:52

Cereal

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dax · Accepted Answer · 2014-05-30 13:31:26Z

0

You've defined your hash using the key: value syntax which is shorthand for :key => value - meaning the keys are symbols and not strings

eligibility_scale.select {|h| h[:family_size] == 4 }

edited May 30, 2014 at 13:31

answered May 30, 2014 at 13:14

dax

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