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

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
    }
  ]
}

CodePudding user response：

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)