Converting nested hash keys from CamelCase to snake_case in Ruby

Question

I\'m trying to build an API wrapper gem, and having issues with converting hash keys to a more Rubyish format from the JSON the API returns.

The JSON contains multip

Answer 1

Use deep_transform_keys for recursive conversion.

transform_keys only convert it in high level

hash = { camelCase: 'value1', changeMe: {nestedMe: 'value2'} }

hash.transform_keys { |key| key.to_s.underscore }
# => { "camel_case" => "value1", "change_me" => {nestedMe: 'value2'} }

deep_transform_keys will go deeper and transform all nested hashes as well.

hash = { camelCase: 'value1', changeMe: {nestedMe: 'value2'} }

hash.deep_transform_keys { |key| key.to_s.underscore }
# => { "camel_case" => "value1", "change_me" => {nested_me: 'value2'} }