How do I convert a Ruby hash so that all of its keys are symbols?

Question

I have a Ruby hash which looks like:

{ \"id\" => \"123\", \"name\" => \"test\" }

I would like to convert it to:

{ :id         


        

Answer 1

Starting with Ruby 2.5 you can use the transform_key method.

So in your case it would be:

h = { "id" => "123", "name" => "test" }
h.transform_keys!(&:to_sym)      #=> {:id=>"123", :name=>"test"}

Note: the same methods are also available on Ruby on Rails.

Answer 2

Try this:

hash = {"apple" => "banana", "coconut" => "domino"}
 # => {"apple"=>"banana", "coconut"=>"domino"} 

hash.tap do |h|
  h.keys.each { |k| h[k.to_sym] = h.delete(k) }
end
 # => {:apple=>"banana", :coconut=>"domino"} 

This iterates over the keys, and for each one, it deletes the stringified key and assigns its value to the symbolized key.

Answer 3

If you're using Rails (or just Active Support):

{ "id" => "123", "name" => "test" }.symbolize_keys