Rails 5，“nil 不是有效的资产来源"

问题描述

我刚刚升级到 Rails 5，但在尝试显示图像时遇到了一个奇怪的问题.

I have just upgraded to Rails 5 and I have a weird issue while trying to show an image.

我有 Rails 4 的确切代码:

I have the exact code I had for Rails 4:

<%= image_tag article.image_url(:thumb) %>

但升级后我得到:

nil is not a valid asset source

在升级到 Rails 5 之前，我没有遇到任何类似的问题.

Before upgrading to Rails 5, I didn't have any similar issue.

这里可能有什么问题?会不会是其他原因而不是 Rails 升级问题?

What could be at fault here? Can it be something else and not a Rails upgrade issue?

推荐答案

问题是我试图显示不存在的图像.

The problem was that I was trying to show an image that did not exist.

添加除非 article.image.blank? 解决了:

<%= image_tag article.image_url(:thumb) unless article.image.blank? %>

在 Rails 4 中，这只会在没有错误的情况下呈现任何内容，而在Rails 5 它引发了一个错误.所以这实际上是一个升级问题.

In Rails 4, this would have just rendered nothing without errors, while inRails 5 it raises an error. So it was, in fact, an upgrade issue.

非常感谢@BookOfGreg 指出这一点.

Big thanks to @BookOfGreg for pointing this out.

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