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copied!<p>All,</p> <p><a href="https://stackoverflow.com/users/155351/hakunin">Hakunin</a> was on the money. I was calling the partial in more than one spot. The second spot was in my helper method "link_to_add_fields." I use this to add fields using javascript.</p> <p>The method looked like this:</p> <pre><code># generates add fields on a dynamic form def link_to_add_fields(name, f, association, locals={}) new_object = f.object.class.reflect_on_association(association).klass.new fields = f.fields_for(association, new_object, :child_index => "new_#{association}") do |builder| render(association.to_s.singularize + "_fields", :f => builder) end link_to(name, "#", :class => "dynamic_add", 'data-association' => "#{association}", 'data-content' => "#{fields}") end </code></pre> <p>Notice that this does not allow any locals to be passed to the render method. I changed it like so:</p> <pre><code># generates add fields on a dynamic form def link_to_add_fields(name, f, association, locals={}) new_object = f.object.class.reflect_on_association(association).klass.new fields = f.fields_for(association, new_object, :child_index => "new_#{association}") do |builder| render(association.to_s.singularize + "_fields", locals.merge!(:f => builder)) end link_to(name, "#", :class => "dynamic_add", 'data-association' => "#{association}", 'data-content' => "#{fields}") end </code></pre> <p>Now my link_to_add_fields call in my _form partial looks like this:</p> <pre><code><%= link_to_add_fields "Add a comment", f, :comments, :tester => true %> </code></pre> <p>...and I can dynamically add fields to my form AND pass additional locals. Hopefully, this will help someone else out.</p>

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