自由課題、画像クリックで add_to_cart アクションを呼び出す

link_to "innerHTML", { :action => "foo" }, { html_options }

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

@@ -2,7 +2,7 @@
 
 <% for product in @products -%>
 <div class="entry">
-  <%= image_tag(product.image_url) %>
+  <%= link_to image_tag(product.image_url), { :action => "add_to_cart" }, { :method => "post" } %>
   <h3><%=h product.title %></h3>
   <%= product.description %>
   <div class="price-line">