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铁路阵列的无损价值 3
原标题:Nil value for array in Rails 3

我觉得像一个老板提出这样的要求,但既然我给发展带来了新的希望,而且我现在坐在这里一小时做一件非常简单的工作,我需要问。

我愿向每个植被展示,但我仍然希望:

You have a nil object when you didn t expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.each

I Trial using <%= debug @widgets %>and <%= @widgets. 检查百分比;但我指挥中没有显示迅速或浏览器。

我正试图在

在我的控制人员中,我叫P-2职等的主计长:

def widgets_to_show
  @widgets = Widget.all
end 

我认为(pwidgets_to_show),我已经:

<% @widgets.each do |widget| %>
  <%= widget.title %>
<% end %>
  • I have a widget model
  • I also have values in the widgets table
  • and I have a title field, so I m not sure what I m doing wrong

我试图在一页上展示它,该页使用了高压胶合物(https://github.com/thoughtbot/high_voltage),这样会有所改变。

最佳回答

@Dave Newton建议从您的console(而不是 irb)处获取植被。 您的终点站的地址如下:

# from your rails project dir
$ rails c
$ w = Widgets.all
$ puts w
$ w.each { |n| puts n.title }

如果所有这些工作都如此,我们就更需要了解问题是什么。

<><>Edit>:

我的猜测是,在同一个网页上使用高压电能是一件事。 它为创建<>static网页提供了格言,从而干扰了展示你的植被,因为你所做的是dynamic

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