Rails: fields_for with index?

by

The answer is quite simple as the solution is provided within Rails. You can use f.options params. So, inside your rendered _some_form.html.erb,

Index can be accessed by:

<%= f.options[:child_index] %>

You don’t need to do anything else.

Update: It seems that my answer wasn’t clear enough…

Original HTML File:

<!-- Main ERB File -->
<% f.fields_for :questions do |builder| %>  
  <%= render 'some_form', :f => builder %>
<% end %>

Rendered Sub-Form:

<!-- _some_form.html.erb -->
<%= f.options[:child_index] %>

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