"ActionView :: Template :: Error(未预编译)"在"image_tag nil"上引发 [英] "ActionView::Template::Error ( isn't precompiled)" raised on "image_tag nil"

问题描述

如果我不能正确处理视图，生产环境将显示500.

If I don't handle view correctly, Production environment show 500.

<%= image_tag post.user.image_url %>

可能是

<%= image_tag post.user.image_url if post.user && post.user.image_url %>

但是我有点粗心，忘记了几次这个问题.

but I am little careless and forgot this issue several times.

如何防止这种情况?如何在生产环境中使用<%= image_tag nil %>而不提高500?

How can I prevent this? How can I use <%= image_tag nil %> in production environment without raising 500?

推荐答案

image_tag必须有一个源，Rails不能执行任何操作，但是会引发异常.

image_tag must have a source, Rails can do nothing with it, but raise an exception.

您可以像这样编写一个助手:

You can write a helper like this:

module ApplicationHelper
  def safe_image_tag(source, options = {})
    source ||= "default.jpg"
    image_tag(source, options)
  end
end

或直接在视图中直接检查nil.无论如何，您都必须做些 来防止错误.

or simply check for nil directly in a view. Anyway you have to do something to prevent an error.

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