如何检查哈希中是否存在特定密钥? [英] How to check if a specific key is present in a hash or not?

问题描述

我要检查会话哈希中是否存在用户"键.我该怎么办?

I want to check whether the "user" key is present or not in the session hash. How can I do this?

请注意，我不想检查键的值是否为nil.我只想检查用户" 键是否存在.

Note that I don't want to check whether the key's value is nil or not. I just want to check whether the "user" key is present.

推荐答案

Hash的key?方法告诉您是否存在给定密钥.

Hash's key? method tells you whether a given key is present or not.

session.key?("user")

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