apps/web/templates/books/_form.html.erb
<% unless params.valid? %>
<div class="errors">
<h3>There was a problem with your submission</h3>
<ul>
<% params.error_messages.each do |message| %>
<li><%= message %></li>
<% end %>
</ul>
</div>
<% end %>
<%=
form_for form, {} do
div class: 'input' do
label :title
text_field :title
end
div class: 'input' do
label :author
text_field :author
end
div class: 'controls' do
submit submit_label
end
end
%>