No nested attributes

[wheeyls]

I'm using Negative Captcha for a pretty complex form, and had a need to support nested attributes; something in the form of:

= form_for user do |f|
  = f.fields_for :details do |ff|
    = f.text_field :location

I've cut a branch that lets you do this:

NegativeCaptcha.new fields: [:user, details: [:location]]

Unfortunately, in my project I'm not using your helpers, and because there are not any tests for them I wasn't able to make sure that they work without changing the API.

My code is here: https://github.com/G2Labs-net/negative-captcha/tree/nested-params

Do you know if there is a simpler way to achieve this?