在一个模板中,我在某个行程中进行了几天的迭代:
<%= for day <- @days do %>
<tr>
<td><%= day.number %></td>
<td><%= day.main_event_time %></td>
<td><%= day.main_event %></td>
<td><%= day.location %></td>
<td><%= day.who %></td>
<td><%= day.summary %></td>
<td><%= day.lodging %></td>
<td><%= link "Show", to: day_path(@conn, :show, day) %></td>
<td><%= link "Edit", to: day_path(@conn, :edit, day) %></td>
<td><%= link "Delete", to: day_path(@conn, :delete, day), method: :delete %></td>
</tr>
<% end %>
在没有日子的情况下,我想有不同的消息。我怎样才能做到这一点?