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<%= error_messages_for :comment %> <% form_for(:comment, :url => collection_url) do |f| %>

Post
<%= f.text_field :post_id %>

Author
<%= f.text_field :author %>

Body
<%= f.text_area :body %>

<%= submit_tag "Create" %>

<% end %> <%= link_to 'Back', collection_url %>