Question

I have an array like so:

[
    [0] {
        "Success" => true
    },
    [1] {
        "Success" => true
    },
    [2] {
        "Success" => true
    },
    [3] {
        "Success" => true
    }
]

Each number above has a much larger multidimensional array associated with it, but that is not my concern currently. I am wanting to rename the numbers [0..3] with new key values.

So it would look like this

[
    ["pop"] {
        "Success" => true
    },
    ["rock"] {
        "Success" => true
    },
    ["country"] {
        "Success" => true
    },
    ["soul/r&b"] {
        "Success" => true
    }
]

Thanks in advance!

Answer 1

if your input is really JSON, you need to first parse the JSON and convert it into a Ruby data structure:

require 'active_support'

json = "[[0,{\"Success\":true}],[1,{\"Success\":true}],[2,{\"Success\":true}],[3,{\"Success\":true}]]"

array = ActiveSupport::JSON.decode( json )
 => [ [0, { "Success" => true }], [1, { "Success" => true }], [2, { "Success" => true }], [3, { "Success" => true }] ]

Now your input is a Ruby Array…

I assume you have the new keys stored in an array somewhere like this:

new_keys = %w{pop rock country soul/r&b}
 => ["pop", "rock", "country", "soul/r&b"] 

Next step is to replace the first element of each of the sub-arrays in the JSON array with the new key:

result = Array.new
array.each do |value|
   i, rest = value
   result << [ new_keys[i], rest ]
end

json = result.to_json

  => "[[\"pop\",{\"Success\":true}],
       [\"rock\",{\"Success\":true}],
       [\"country\",{\"Success\":true}],
       [\"soul/r&b\",{\"Success\":true}]]"