如何在Ruby中不覆盖重复键的情况下合并两个哈希? [英] How can I merge two hashes without overwritten duplicate keys in Ruby?

问题描述

是否有一种简单或优雅的方式来合并两个散列而不覆盖重复键?

Is there an easy or elegant way to merge two hashes without overwriting duplicate keys?

也就是说，如果键存在于原始散列中，我不想更改其值.

That is, if the key is present in the original hash I don't want to change its value.

推荐答案

如果你有两个散列，options 和 defaults，并且你想合并 defaults 到 options 而不覆盖现有的键，你真正想要做的是相反的:将 options 合并到 defaults 中:

If you have two hashes, options and defaults, and you want to merge defaults into options without overwriting existing keys, what you really want to do is the reverse: merge options into defaults:

options = defaults.merge(options)

或者，如果您使用 Rails，您可以这样做:

Or, if you're using Rails you can do:

options.reverse_merge!(defaults)

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