如果 flash name == 'notice' 在 rails 视图中不起作用 [英] if flash name == 'notice' not working in rails view

问题描述

<% flash.each do |key, msg| %>
  <% if key == 'notice' %>
      <%= content_tag :div, "<button type='button' class='close' data-dismiss='alert' aria-hidden='true'>&times;</button> #{key}".html_safe, class: 'alert alert-success alert-dismissable' %>
  <% elsif key == 'alert' %>
      <%= content_tag :div, "<button type='button' class='close' data-dismiss='alert' aria-hidden='true'>&times;</button> #{msg}".html_safe, class: 'alert alert-danger alert-dismissable' %>
  <% end %>
<% end %>

不适合我.

• 当我执行 <% if true %> 时，它会起作用.
• 当我输出 key 时，它会显示 notice.

• When I do <% if true %> it works.
• When I output the key, it says notice.

为什么它不起作用?

推荐答案

对于 Rails 4 及以下，flash key 是一个 Symbol 和对于Rails 4.1，flash key 是一个String.我想您正在使用 Rails 4 或以下 并与它们的 String 等效项进行比较，这是您问题的根源.

For Rails 4 and under, flash key is a Symbol and for Rails 4.1, flash key is a String. I suppose you are using Rails 4 or under and comparing against their String equivalents which is root of your problem.

您可以通过两种方式解决:

You can resolve it in two ways:

1. 将密钥从 Symbol 转换为 String，然后将其与 String notice 或 alert 进行比较.这种方式更好，因为稍后当您将 Rails 版本升级到 4.1 时，您将不会再遇到当前的问题.

1. Convert the key from Symbol to String and then compare it against String notice or alert. This way is better because later when you upgrade the Rails version to 4.1 you won't face the current problem again.

<% if key.to_s == 'notice' %>
  <%# .. %>
<% elsif key.to_s == 'alert' %>
  <%# ..%>
<% end %> 

直接与符号:notice 和:alert 进行比较.这暂时有效，但在升级 Rails 版本时无效.

Directly compare with the symbols :notice and :alert. This will work for now but would not work when you upgrade the Rails version.

<% if key == :notice %>
  <%# .. %>
<% elsif key == :alert %>
  <%# ..%>
<% end %> 

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