Have you ever needed to automatically convert Rubyish snake_case to JSON-style camelBack or CamelCase hash keys?

Awrence to the rescue!

This gem recursively converts all snake_case keys in a hash structure to camelBack or CamelCase.

• Ruby >= 3.0

For Ruby < 3.0 use version 2.0.1

Add this to your Gemfile:

gem "awrence"

Or install it yourself as:

gem install awrence

my_hash = {"first_key" => 1, "foo_bars" => [{"baz_baz" => "value"}, {"blah_blah" => "value"}]}
camel_hash = my_hash.to_camel_keys
# => {"FirstKey" => 1, "FooBars" => [{"BazBaz" => "value"}, {"BlahBlah" => "value"}]}

# OR

camel_hash = my_hash.to_camelback_keys
# => {"firstKey" => 1, "fooBars" => [{"bazBaz" => "value"}, {"blahBlah" => "value"}]}

Awrence works on either string keys or symbolized keys. It has no dependencies, as it has its own camelize method lifted out of ActiveSupport.

You can set acronyms that Awrence will now check against when converting the keys.

Awrence.acronyms = { "url" => "URL", "id" => "ID" }

my_hash = { "user_url" => "http://a.com", "user_id" => 2 }
camel_hash = my_hash.to_camel_keys
# => { "UserURL" => "http://a.com", "UserID" => 2 }

camel_hash = my_hash.to_camelback_keys
# => { "userURL" => "http://a.com", "userID" => 2 }

The acronym will be ignored when it's the first word and to_camelback_keys is called.

Awrence.acronyms = { "id" => "ID" }

my_hash = { "id" => 2 }
camel_hash = my_hash.to_camel_keys
# => { "ID" => 2 }

camel_hash = my_hash.to_camelback_keys
# => { "id" => 2 }

• There is no Hash#to_camel_keys! form.

If you've already got CamelCase and need to snake_case it, you are encouraged to try the Plissken gem.

Bug reports and pull requests are welcome on GitHub at https://github.com/technicalpanda/awrence. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

The gem is available as open source under the terms of the MIT License.

Everyone interacting with this project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.