app/views/boards/_form.html.erb
<%= form_for @board, html: { multipart: true } do |f| %>
<% if @board.errors.any? %>
<div id="error_explanation">
<h2><%="Uh oh, you got" + pluralize(@board.errors.count, "error!")%></h2>
<ul>
<% @board.errors.full_messages.each do |msg| %>
<li><%=msg%></li>
<% end %>
</ul>
</div>
<% end %>
<table>
<tr>
<td class="fieldlabel">Name</td>
<td class="field"><%= f.text_field :name %></td>
</tr>
<tr>
<td class="fieldlabel">Banner</td>
<td class="field"><%= f.file_field :banner %></td>
</tr>
<tr>
<td class="fieldlabel">Password</td>
<td class="field"><%= password_field_tag :password %>
</tr>
</table>
<%= f.submit value: 'Create board', id: 'submit' %>
<% end %>