edit.rhtml

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<h1>Editing product</h1>

<%= error_messages_for :product %>

<% form_for(:product, :url => product_path(@product), :html => { :method => :put }) do |f| %>
  <p>
    <b>Name</b><br />
    <%= f.text_field :name %>
  </p>

  <p>
    <b>Category</b><br />

    <% @categories = Category.find(:all, :include => "products") %>
    <select>
      <%= option_groups_from_collection_for_select(@categories, :products, :name, :id, :name) %>
    </select>
  
  </p>

  <p>
    <%= submit_tag "Update" %>
  </p>
<% end %>

<%= link_to 'Show', product_path(@product) %> |
<%= link_to 'Back', products_path %>