index.html.erb

<div id='search-form'>
  <%= form_tag(root_path, method: :get) do %>
    <%= search_field_tag :looking_for, nil, placeholder: "Book Title..." %>
    <%= submit_tag 'Search', id: 'submit-button' %>
  <% end %>
</div>

<% if @books.empty? %>

No books found matching '<%= @search_term %>'

<% else %>

<table border="1">
  <tr>
    <th>Image</th>
    <th>Title</th>
    <th>Author</th>
    <th>Description</th>
    <th></th>
  </tr>
  <% @books.each do |book| %>
    <tr class=<%= cycle('even', 'odd') %>>
      <td><%= link_to image_tag(book["volumeInfo"]["imageLinks"]["smallThumbnail"], class: "linked-image"),
                book["volumeInfo"]["previewLink"] if book["volumeInfo"]["imageLinks"]%></td>
      <td><%= link_to(book["volumeInfo"]["title"], book["volumeInfo"]["previewLink"]) %></td>
      <td><%= book["volumeInfo"]["authors"].join(',') if book["volumeInfo"]["authors"] %></td>
      <td><%= sanitize(book["volumeInfo"]["description"]) %></td>
      <td><%= link_to("Buy on Amazon", "https://www.amazon.com/dp/#{book['isbn10']}?tag=#{@amazon_tag}") if book['isbn10'] %></td>
    </tr>
  <% end %>
</table>

<% end %>