if 语句 Ruby on Rails
我知道这可能相当微不足道，但我已经查看了之前的问题并尝试过它们，但不幸的是它们仍然发出错误：s
我的问题如下，我有一个 html.erb 文件，我想要一个特定的正文在给定条件或其他条件下显示的文本（如果条件为假）
我有
<% if [email protected] do %>
这里有更多代码
<% end %>
我尝试了很多组合，但最常见的错误是
当你没有预料到时，你得到了一个 nil 对象！ 评估 nil.nil 时发生错误
我不确定我做错了什么，这很可能很简单，但我找不到解决方法！
I know this is probably rather trivial but I have had a look at previous questions and I've tried them but they still issued an error unfortunately :s
My issue is the following, I have an html.erb file and I want a certain body text to be display given a condition or another if it is false
I have
<% if [email protected] do %>
more code goes here
<% end %>
I have tried many combinations but the most frequent error i keep getting is
You have a nil object when you didn't expect it!
The error occurred while evaluating nil.nil
I'm not sure what I'm doing wrong, this is most likely something very easy but I can't find my way through it!
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评论（4）
没有
.nil方法。您正在考虑.nil？。它应该是[电子邮件受保护]？。或者，您可以从
if @selector获得相同的结果，并且其计算结果将与if [电子邮件受保护]？。这是假设您没有引用布尔值。There's no
.nilmethod. You're thinking of.nil?. It should be[email protected]?.Or you could get the same result from
if @selectorand it will evaluate to be the same asif [email protected]?. This is assuming you not referring to a boolean.也许尝试.nil？或 == nil，或者仔细查看为 @selector 赋值的控制器代码。
Maybe try .nil? or == nil, or take a close look at your controller code that's assigning a value to @selector.
就
足够了
just
is enough
在 Rails 中，更惯用的方式是 <% if @selector.present?做%>或者用惯用的 Ruby <% 除非@selector.nil？做%>
In Rails, a more idiomatic way would be <% if @selector.present? do %> or in idiomatic Ruby <% unless @selector.nil? do %>