Rails 单行 if else 语句 [英] Rails single line if else statement

问题描述

我正在尝试在视图中编写一行 if else 语句.

I'm trying to write a single line if else statement in a view.

<%= collection.name ? collection.name : @miniature.name %>

如果存在 collection.name，我希望它放，否则我希望它放 @miniature.name

I want it to put collection.name if one exists, otherwise I want it to put @miniature.name

推荐答案

为了更清楚，你可以使用逻辑 OR 和 ActiveSupport's Object#presence(仅在 collection.name 存在且不为空时才放入):

To make it even clearer, you can use logical OR and ActiveSupport's Object#presence (to put collection.name only if it exists and isn't blank):

<%= collection.name.presence || @miniature.name %>

如果你想显示 collection.name 如果它不是 nil，但它是空白的(空字符串或只包含空格的字符串)，它就足够了:

If you want to display collection.name if it's not nil, but it's blank (empty string or string containing only whitespace), it will be enough to have:

<%= collection.name || @miniature.name %>

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