英文:
Return nil instead of undefined method `[]' for nil:NilClass when having array of objects
问题
我有以下的 @params，其中 people 是一个对象数组。
{"people"=>[{"email"=>"sample1@google.com"}, {"email"=>"sample@google.com"}]}
当我尝试访问 @params[:people][0][:email] 时，如果任何电子邮件或人员不存在，或者如果 @params[:people] 有一个空数组并且我们尝试获取电子邮件时，我想要得到 nil 而不是未定义方法'[]'的错误，用于nil:NilClass。
我发现我们可以使用 @params.dig(:people)，但我想知道如何考虑数组 [0] 并实现这一点。
英文:
I have the following @params where people is an array of objects.
{"people"=>[{"email"=>"sample1@google.com"}, {"email"=>"sample@google.com"}]}
I am looking for a way to get back nil instead of the undefined method '[]' for nil:NilClass error when I try to access @params[:people][0][:email] when any of the emails or people are not present or if @params[:people] has an empty array and we try to get the email.
I found that we could use @params.dig(:people) but I would like to know how I can consider the array [0] and achieve this?
答案1
得分: 2
以下是翻译好的部分：
@params.dig(:people, 0, :email)
示例：
params = { people: [{ email: 'foo@example.com' }] }
params.dig(:people, 0, :email)
# => "foo@example.com"
params = { people: [] }
params.dig(:people, 0, :email)
# => nil
英文:
The following will do the job:
@params.dig(:people, 0, :email)
Example:
params = { people: [{ email: 'foo@example.com' }] }
params.dig(:people, 0, :email)
#=> "foo@example.com"
params = { people: [] }
params.dig(:people, 0, :email)
#=> nil
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