CODEWITHSUNDEEP
arraysrubyhash
Rakesh Verma
Rakesh Verma

Reputation: 9

Convert array of hash to single hash in ruby

I am trying to convert an array of hashes into a hash with key as one of the elements of hash in the array.

For example: a = [{"active_accounts": 3, "id": 5}, {"active_accounts": 6, "id": 1}

I want to convert this array to 

a = {5: {"active_accounts": 3}, 1: {"active_accounts": 6}}

I have tried doing it by looping over the array and accessing individual hash for a particular key but that doesn't seem to work. Any leads would be appreciated.

Upvotes: 0

Views: 236

Answers (3)

Oleksandr Holubenko
Oleksandr Holubenko

Reputation: 4440

One more possible solution)

a.map { |hash| [hash.delete(:id), hash] }.to_h
#=> {5=>{:active_accounts=>3}, 1=>{:active_accounts=>6}}

Upvotes: 1

Ranganath Nyamagoudar
Ranganath Nyamagoudar

Reputation: 81

a.each_with_object({}) {|obj , hash| hash.merge!(Hash[obj[:id], Hash["active_accounts",obj[:active_accounts]]])}

# {5=>{"active_accounts"=>3}, 1=>{"active_accounts"=>6}}

Hope it helps.

Upvotes: 2

Aleksei Matiushkin
Aleksei Matiushkin

Reputation: 121000

Safe variant, mapping to arrays (same "id" are expected and treated properly):

a.group_by { |e| e.delete("id") }

Exactly what you asked:

a.group_by { |e| e.delete("id") }
 .map { |k, v| [k, v.first] }
 .to_h

Upvotes: 1

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