我如何在存储在哈希中的数组内搜索字符串值

Question

I am using ruby on rails and trying to figure out if I can (and/or how I) search for a Hash within an Array for a specific string value? If there is a match (finds Bob), I want it to 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"
    }
]

```

I see this example on Stack Overflow - but it is numeric. Mine is a string. How do I get a hash from an array based on a value in the hash?

Many thanks.

Answer 1

I have not tried this as I am out now, but this could work

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"
    }
]

If you want to select all of the matching hashes you can use select

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

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

If you simply want to check for true or false , use any?

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

#=> true

If you are only interested in the first instance. You can use 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?