Select a value from a nested hash with unknown keys

Question

I have a hash that looks something like this:

hash = { "data" => {
    "Aatrox" => {
        "id" => "Aatrox",
        "key" => "266",
        "name" => "Aatrox"
        },
    "Ahri" => {
        "id" => "Ahri",
        "key" => "123",
        "name" => "Ahri"
        },
    "Another name" => {
        "id" => "Another name",
        "key" => "12",
        "name" => "Another name"
        },
   }
}

I'm trying to get the value from "id" that matches a given key:

def get_champion_name_from_id(key)
    filtered = @champion_data["data"].select do | key, champ_data |
        Integer(champ_data["key"]) == key
    end     
end

I'm using select to get the items that match the block, however, the return value is another hash that looks like this:

{ 
    "Aatrox": {
        "id" => "Aatrox",
        "key" => "266",
        "name" => "Aatrox"
    } 
}

How can I avoid this and get just the last nested hash? If the key passed was 266, I want to get this hash:

{
    "id" => "Aatrox",
    "key" => "266",
    "name" => "Aatrox"
}

This hash is the result of a parsed JSON file, so there's no way I can do filtered["Aatrox"] to get a given value.

falsetru · Accepted Answer · 2015-12-16 06:32:10Z

7

Hash#values returns values only (without keys). And by using Enumerable#find, you will get the first matched item instead of an array that contains a single item.

@champion_data['data'].values.find { |champ_data|
  champ_data['key'] == '266'
}
# => {"id"=>"Aatrox", "key"=>"266", "name"=>"Aatrox"}

def get_champion_name_from_id(key)
  key = key.to_s
  @champion_data['data'].values.find { |champ_data|
    champ_data['key'] == key
  }
end

edited Dec 16, 2015 at 6:32

answered Dec 16, 2015 at 5:39

falsetru

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1 Comment

Carlos Martinez Over a year ago

This is great, much cleaner than what I was trying, thanks a lot!

the Tin Man · Accepted Answer · 2015-12-16 07:57:41Z

0

You can do it with the select method also:

@champion_data["data"].select do |key, val|
  @champion_data["data"][key] if @champion_data["data"][key]["key"] == "266"
end

edited Dec 16, 2015 at 7:57

the Tin Man

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answered Dec 16, 2015 at 5:53

Triveni Badgujar

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1 Comment

Carlos Martinez Over a year ago

This returns the same result, another nested hash, which is not what I'm looking for

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