How to replace a hash key with another key

Question

I have a condition where, I get a hash

  hash = {\"_id\"=>\"4de7140772f8be03da000018\", .....}

and I want this hash as

Answer 1

Answering exactly what was asked:

hash = {"_id"=>"4de7140772f8be03da000018"}
hash.transform_keys { |key| key[1..] }
# => {"id"=>"4de7140772f8be03da000018"}

The method transform_keys exists in the Hash class since Ruby version 2.5.

https://blog.bigbinary.com/2018/01/09/ruby-2-5-adds-hash-transform_keys-method.html