How do I get the index of a field inside `inputs_for`?

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1 
<%= inputs_for f, :property, fn p_f -> %>
  <h1>property index: <%= "??" %></h1>
  <%= label p_f, :value %>
  <%= text_input p_f, :value %>
  <%= error_tag p_f, :value %>
<% end %>

how do I get the index of a field inside inputs_for?

2

p_f.index will hold the index

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