Question

我知道之前已经回答了这个问题，但是我已经阅读了大部分内容，但我仍然无法弄明白。有人知道会发生什么事吗？

<% if current_user.try(:email) == Join.all(:email) %>
      <div class="panel-default">
        <div class="panel-body">
          You're already signed up for this month! Thanks!
        </div>
      </div>
    <% else %>
      <% if user_signed_in? %>
        <%= form_for @join do |f| %>
          <%= f.email_field :email, value: current_user.email, class: "form-control input-lg", id: "join" %> <br>
          <%= f.submit "Join This Month's Rewards", class: "btn btn-success btn-lg" %>
        <% end %>
      <% end %>
    <% else %>
      <div class="panel panel-default">
      <div class="panel-body">
        Sorry, you're not currently signed in, so you can't sign up for our rewards. You can sign in <a href="/users/sign_in">here.</a>
      </div>
      </div>
  <% end %>

以下是完整错误：/Users/Sam/Documents/workspace/rewardsApp/app/views/joins/new.html.erb:19: syntax error, unexpected keyword_else, expecting keyword_end else ^错误位于第29行，即<% else %>之后的<% end %> 非常感谢帮助！

Answer 1

您的if / else设置似乎过早结束，以便考虑视图的三种状态。

<% if current_user.try(:email) == Join.all(:email) %>
      <div class="panel-default">
        <div class="panel-body">
          You're already signed up for this month! Thanks!
        </div>
      </div>
    <% else %>
      <% if user_signed_in? %>
        <%= form_for @join do |f| %>
          <%= f.email_field :email, value: current_user.email, class: "form-control input-lg", id: "join" %> <br>
          <%= f.submit "Join This Month's Rewards", class: "btn btn-success btn-lg" %>
      <% else %>
          <div class="panel panel-default">
          <div class="panel-body">
            Sorry, you're not currently signed in, so you can't sign up for our rewards. You can sign in <a href="/users/sign_in">here.</a>
          </div>
          </div>
      <% end %>
  <% end %>

Answer 2

这可能是为什么适当地缩进代码非常有用的一个很好的例子。一旦这样做，很明显你有第二个else条款。

<% if current_user.try(:email) == Join.all(:email) %>
  <div class="panel-default">
    <div class="panel-body">
      You're already signed up for this month! Thanks!
    </div>
  </div>
<% else %>
  <% if user_signed_in? %>
    <%= form_for @join do |f| %>
      <%= f.email_field :email, value: current_user.email, class: "form-control input-lg", id: "join" %> <br>
      <%= f.submit "Join This Month's Rewards", class: "btn btn-success btn-lg" %>
    <% end %>
  <% end %>
<% else %> <%# <= Uh oh, second else clause %>
  <div class="panel panel-default">
    <div class="panel-body">
      Sorry, you're not currently signed in, so you can't sign up for our rewards. You can sign in <a href="/users/sign_in">here.</a>
    </div>
  </div>
<% end %>

语法错误，意外的keyword_else，期望输入结束否则^

2 个答案: