检查 nil 警告有关意外 nil 的信息 [英] Check for nil warns about unexpected nil

问题描述

我对 nil 进行了以下检查:

I have the following check for nil:

client = !deal['deal']['party']['party'].nil? ? deal['deal']['party']['party']['company_id'] : ""

但我仍然得到:

当你没想到的时候，你得到了一个 nil 对象！您可能期望有一个 ActiveRecord::Base 实例.评估 nil 时发生错误.[]

You have a nil object when you didn't expect it! You might have expected an instance of ActiveRecord::Base. The error occurred while evaluating nil.[]

我怎样才能防止这种情况发生?

How can I prevent this?

推荐答案

我不懂 Ruby，但我认为它在 .nil 之前出错了:

I don't know Ruby, but I think it goes wrong before the .nil:

deal['deal']['party']['party']
    ^       ^        ^

箭头表示可能的 nil 索引.例如，如果 ["deal"] 为零或第一个 ["party"] 为零怎么办?

The arrows indicate possible nil indexes. For example, what if ["deal"] is nil or the first ["party"] is nil?

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