如何在存储在散列中的数组中搜索字符串值

Question

我在 rails 上使用 ruby 并试图弄清楚我是否可以（and/or 我如何）在数组中搜索特定字符串值的哈希？如果有匹配项（找到 Bob），我希望它 return True。

```

string_query = "Bob@gmail.com"

email_array is the following:                                                                                                                       
[
    [0] {
        "email" => "bill@gmail.com",
         "name" => "william"
    },
    [1] {
        "email" => "mike@gmail.com",
         "name" => "michael"
    },
    [2] {
        "email" => "Bob@gmail.com",
         "name" => "robert"
    }
]

```

我在 Stack Overflow 上看到了这个例子 - 但它是数字的。我的是一个字符串。 How do I get a hash from an array based on a value in the hash?

非常感谢。

Answer 1

我还没试过这个，因为我现在出去了，但这可行

string_query = "Bob@gmail.com"
email_array.each do |s|
   if s['email'] == string_query
       #your comparision statements here 
   end
end

Answer 2

string_query = "Bob@gmail.com"


email_array = [{
        "email" => "bill@gmail.com",
         "name" => "william"
    },
    {
        "email" => "mike@gmail.com",
         "name" => "michael"
    },
    {
        "email" => "Bob@gmail.com",
         "name" => "robert"
    },
    {
        "email" => "Bob@gmail.com",
         "name" => "robert2"
    }
]

如果你想要 select 所有匹配的哈希，你可以使用 select

email_array.select {|hash| hash["email"] == string_query }

#=> [{"email"=>"Bob@gmail.com", "name"=>"robert"}, {"email"=>"Bob@gmail.com", "name"=>"robert2"}]

如果您只想检查 true 或 false，请使用 any?

email_array.any? {|hash| hash["email"] == string_query }

#=> true

如果您只对第一个实例感兴趣。您可以使用 detect

email_array.detect {|hash| hash["email"] == string_query }

#=> {"email"=>"Bob@gmail.com", "name"=>"robert"}

Answer 3

你可以这样做

email_array.select {|hash| hash["email"] == string_query }.present?

如何在存储在散列中的数组中搜索字符串值

how do I search for a string value inside an array stored in a hash

ruby

arrays

hash

ruby-on-rails

enumerator