在Ruby中将哈希数组映射到键控哈希

Question

I have an array of hashes that looks like this:

   array= [
      {
        "id"=> 101,
        "first_name"=> "xxx",
        "last_name"=> "G",
        "email"=> "xxx@yyyy.com",
        "phone_number"=> "555-555-5555"
      },
      {
        "id"=> 102,
        "first_name"=> "Jen",
        "last_name"=> "P",
        "email"=> "jen.p@example.com",
        "phone_number"=> "555-555-5555"
      }
    ]

I want to convert it to a hash that looks like this:

   array = {
          "101"=> 
          {
            "first_name"=> "xxx",
            "last_name"=> "G",
            "email"=> "xxx@yyyy.com",
            "phone_number"=> "555-555-5555"
          },
          "102"=>
          {
            "first_name"=> "Jen",
            "last_name"=> "P",
            "email"=> "jen.p@example.com",
            "phone_number"=> "555-555-5555"
          }
       }

I have tried this but it does not work:

    array.each do |a|
      a.map{|x| x[:id]}
    end

How can I do this in Ruby? I am looking at the map function, but not sure how to implement it in this case. Please help!

Answer 1

This works(desctructive):

>> Hash[array.map { |x| [x.delete("id"), x] }]
=>{
    101=>{
        "first_name"=>"xxx",
        "last_name"=>"G",
        "email"=>"xxx@yyyy.com",
        "phone_number"=>"555-555-5555"
    },
    102=>{
        "first_name"=>"Jen",
        "last_name"=>"P",
        "email"=>"jen.p@example.com",
        "phone_number"=>"555-555-5555"
    }
}

Answer 2

Try this:

array_h = Hash.new
array.each{|a| array_h[a["id"]] = a.reject{|e| e=='id' }}

#Output of array_h:
{
  101=>
    {
      "first_name"=>"xxx", 
      "last_name"=>"G", 
      "email"=>"xxx@yyyy.com", 
      "phone_number"=>"555-555-5555"
    }, 
  102=>
    {
      "first_name"=>"Jen", 
      "last_name"=>"P", 
      "email"=>"jen.p@example.com", 
      "phone_number"=>"555-555-5555"
    }
}

Note: This will not modify your original Array.

Answer 3

Non-destructive variant (preserves array ) while removing "id" :

{}.tap { |h| array.each { |a| nh = a.dup; h[nh.delete('id')] = nh } }
# => {101=>{"first_name"=>"xxx", "last_name"=>"G", "email"=>"xxx@yyyy.com", "phone_number"=>"555-555-5555"}, 102=>{"first_name"=>"Jen", "last_name"=>"P", "email"=>"jen.p@example.com", "phone_number"=>"555-555-5555"}} 
array
# => [{"id"=>101, "first_name"=>"xxx", "last_name"=>"G", "email"=>"xxx@yyyy.com", "phone_number"=>"555-555-5555"}, {"id"=>102, "first_name"=>"Jen", "last_name"=>"P", "email"=>"jen.p@example.com", "phone_number"=>"555-555-5555"}]