Formtastic::FormBuilder#semantic_fields_for

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This is a wrapper around Rails' `ActionView::Helpers::FormBuilder#fields_for`, originally
provided to ensure that the `:builder` from `semantic_form_for` was passed down into
the nested `fields_for`. Our supported versions of Rails no longer require us to do this,
so this method is provided purely for backwards compatibility and DSL consistency.

When constructing a `fields_for` form fragment *outside* of `semantic_form_for`, please use
`Formtastic::Helpers::FormHelper#semantic_fields_for`.

@see http://api.rubyonrails.org/classes/ActionView/Helpers/FormBuilder.html#method-i-fields_for ActionView::Helpers::FormBuilder#fields_for
@see http://api.rubyonrails.org/classes/ActionView/Helpers/FormHelper.html#method-i-fields_for ActionView::Helpers::FormHelper#fields_for
@see Formtastic::Helpers::FormHelper#semantic_fields_for

@example
  <% semantic_form_for @post do |post| %>
    <% post.semantic_fields_for :author do |author| %>
      <% author.inputs :name %>
    <% end %>
  <% end %>

  <form ...>
    <fieldset class="inputs">
      <ol>
        <li class="string"><input type='text' name='post[author][name]' id='post_author_name' /></li>
      </ol>
    </fieldset>
  </form>

@todo is there a way to test the params structure of the Rails helper we wrap to ensure forward compatibility?
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