Ruby on rails: store all specific key values from a hash into an array

Question

How can I create an array of all "name_printed" keys in the following hash with nil safe navigation?

 {
  "show_data_on_file": "Yes",
  "employees_names_printed_on_badges": [
    {
      "name_printed": "John",
      "badge_id": 12160060
    },
    {
      "name_printed": "Tom",
      "badge_id": 12160080
    }
  ]
}

Sebastián Palma · Accepted Answer · 2021-11-22 22:05:31Z

1

You could use Enumerable#pluck. In the case employees_names_printed_on_badges returns a falsy value, you invoke pluck on an empty array:

(data[:employees_names_printed_on_badges] || []).pluck(:name_printed)
# ["John", "Tom"]

Or use &, which would result in nil if data[:employees_names_printed_on_badges]& is nil.

data[:employees_names_printed_on_badges]&.pluck(:name_printed)

answered Nov 22, 2021 at 22:05

Sebastián Palma

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2 Comments

Vinirdishtith Rana Over a year ago

I was wondering if we could directly dig : name_printed key form this hash without looking at : employees_names_printed_on_badges

Sebastián Palma Over a year ago

You need to reference first employees_names_printed_on_badges, that would be the point of using a Hash. Or you could map each name_printed from the values that are an array.

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