如何在Elixir/Phoenix模板中处理空案例？

Question

在模板中,我在行程中的某些天进行了迭代:

<%= 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 %>

在没有时间的情况下,我希望有一个不同的信息.我怎样才能做到这一点？

Answer 1

你可以在for理解之前或之后把它放在:

<%= if Enum.empty?(@days) do %>
  No days yet.
<% end %>