<%= form_for @plan do |form| %> <%= form.fields_for :meals do |meal| %> <% if meal.object.id == @meal.id %> <%= meal.fields_for :meal_portions do |mp| %> <% if mp.object.id == @meal_portion.id %> <%= render "plans/meals/portion_fields", child: mp, meal_id: @meal.id %> <% end %> <% end %> <% end %> <% end %> <% end %>