Shallow dasherizing and underscoring

What's Changed

• Add options to transform field keys non-recursively (#132) by @protestContest in #310

There are now two new values for the config option transform_fields:

• camelize_shallow: Like camelize, but only affects the relationship and attribute keys, not their values.
• dasherize_shallow: Like dasherize, but only affects the relationship and attribute keys, not their values.

New Contributors

• @protestContest made their first contribution in #310

Full Changelog: 1.6.3...1.7.0