Agile Web Development with Rails, Edition 4

8.5 Iteration C5 - Caching

Turn on caching in development

edit config/environments/development.rb

  config.action_controller.perform_caching = true

add a method to return the latest product

edit app/models/product.rb

  def self.latest

    Product.order(:updated_at).last

end

cache sections

edit app/views/store/index.html.erb

<p id="notice"><%= notice %></p>

<h1>Your Pragmatic Catalog</h1>

<% cache ['store', Product.latest] do %>

  <% @products.each do |product| %>

    <% cache ['entry', product] do %>

      <div class="entry">

        <%= image_tag(product.image_url) %>

        <h3><%= product.title %></h3>

        <%= sanitize(product.description) %>

        <div class="price_line">

          <span class="price"><%= number_to_currency(product.price) %></span>

        </div>

      </div>

    <% end %>

  <% end %>

<% end %>

Turn caching back off

edit config/environments/development.rb

  config.action_controller.perform_caching = false

rm -f public/assets/*

rm -rf tmp/*cache/*