Ruby creating a new hash from an array of key, value

Question

first_response = [
  {"xId" => "123", "yId" => "321"}, 
  {"xId" => "x",   "yId" => "y"  }
]

first_response.each do |resp|
  x_id = resp['xId']
  y_id = resp['yId']
  puts x_id.to_s
  puts y_id.to_s
end

This gives me outputs

output hash I want to create is {123=>{321}, x=>{y}}

first service: I have an array of hash that has two different ids example:(x_id and y_id) (there would be multiple pairs like that in the response)

I want to create a hash that should contain the matching pair of x_id and y_ids that we get from the first service with x_id's as the key for all the pairs.

Do you have examples of the input and expected output, and what you've tried? — Sebastián Palma
– Sebastián Palma, Commented Dec 4, 2021 at 16:12
Hash[[[:a, 1], [:b, 2], [:c, 3]]] gives => {:a=>1, :b=>2, :c=>3} — max
– max, Commented Dec 4, 2021 at 16:19
{ "first_service": [ { "x": "string", "y": "string", "other": { "a": "string", "b": "string", "c": "string" }, "other-2": { "l": "CONFIRMED", "m": "2021-12-03T15:10:21.330Z", "n": "2021-12-03T15:10:21.330Z" } } ] } I want to group this as hash_ = { "x": { 'y': "y", } } — Dev
– Dev, Commented Dec 4, 2021 at 16:38
I can iterate through the first service and get the x and y separately in their own array by iterating through the first service one by one like belowfor both (x and y seperately), but not able to group them. # x = [].tap do |ids| # first.each do |element| # x = element['x'] # ids.push(x) unless x.nil? || ids.include?(x) # end # end — Dev
– Dev, Commented Dec 4, 2021 at 16:45

Sebastián Palma · Accepted Answer · 2021-12-04 18:28:04Z

2

If you know every hash in first_response is going to contain exactly two key/value pairs, you can extract their values and then convert that result into a hash (see Enumerable#to_h):

first_response.to_h(&:values)
# {"123"=>"321", "x"=>"y"}

answered Dec 4, 2021 at 18:28

Sebastián Palma

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2 Comments

Dev Over a year ago

so using the above approach that I shared I can get the output but I think I need to add another key inside of the first one and get the output like {"123"=>{"abc" =>321"}, "x"=>{"xyz"=>"y"}}, how can achieve that

Sebastián Palma Over a year ago

Can you update your question? I don't get how you come up with those abc/xyz keys there @Dev.

Sebastián Palma · Accepted Answer · 2021-12-04 18:28:35Z

1

Looks like this approach works, but I am not completely sure if that is right

first_response = [{"xId"=>"123","yId"=> "321"}, {"xId"=>"x","yId"=> "y"}]                         
h = {}.tap do |element|
  first_response.each do |resp|
    x_id = resp['xId']
    y_id = resp['yId']
    element[x_id] = y_id
  end
end
puts h.to_s
# {"123"=>"321", "x"=>"y"}

edited Dec 4, 2021 at 18:28

Sebastián Palma

33.6k6 gold badges45 silver badges65 bronze badges

answered Dec 4, 2021 at 18:04

Dev

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