如何在嵌套散列中搜索特定鍵的值？

-2

[82] pry(main)> commit2 
=> {:sha=>"4df2b779ddfcb27761c71e00e2b241bfa06a0950", 
:commit=> 
    {:author=> 
    {:name=>"asasa asasa", 
    :email=>"[email protected]", 
    :date=>2016-08-06 16:24:04 UTC, 
    :sha=> "876239789879ab9876c8769287698769876fed"}, 
    :committer=> 
    {:name=>"asasa asasa", 
    :email=>"[email protected]", 
    :date=>2016-08-06 16:26:45 UTC}, 
    :message=> 
    "applies new string literal convention in activerecord/lib\n\nThe current code base is not uniform. After some discussion,\nwe have chosen to go with double quotes by default.", 
    :tree=> 
    {:sha=>"7a83cce62195f7b20afea6d6a8873b953d25cb84", 
    :url=> 
     "https://api.github.com/repos/rails/rails/git/trees/7a83cce62195f7b20afea6d6a8873b953d25cb84"}, 
    :url=> 
    "https://api.github.com/repos/rails/rails/git/commits/4df2b779ddfcb27761c71e00e2b241bfa06a0950", 
    :comment_count=>0}, 
:url=> 
    "https://api.github.com/repos/rails/rails/commits/4df2b779ddfcb27761c71e00e2b241bfa06a0950", 
:html_url=> 
    "https://github.com/rails/rails/commit/4df2b779ddfcb27761c71e00e2b241bfa06a0950", 
:comments_url=> 
    "https://api.github.com/repos/rails/rails/commits/4df2b779ddfcb27761c71e00e2b241bfa06a0950/comments" 
    } 
    } 
}

該散列有很多嵌套的哈希值，但我要檢查，看看是否有任何嵌套的散列有876239789879ab9876c8769287698769876fed一個:sha值。

在上面的例子中，它應該返回[:commit][:author]散列，因爲那個有:sha的鍵值與我們正在尋找的鍵相同。

我該怎麼做？

來源

2017-03-09 marcamillion

那你試試？ –

此外，請使用正確的語法發佈完整的Ruby對象。 –

@EricDuminil我修改了它的代碼，使它成爲一個完整的Ruby對象，語法正確。 – marcamillion

這裏是一個遞歸方法：

data = {a: {b: :c, d: :e}, f: {g: {h: {i: :j}}}} 

def find_value_in_nested_hash(data, desired_value) 
    data.values.each do |value| 
    case value 
    when desired_value 
     return data 
    when Hash 
     f = find_value_in_nested_hash(value, desired_value) 
     return f if f 
    end 
    end 
    nil 
end 

p find_value_in_nested_hash(data, :e) 
# {b=>:c, :d=>:e}

你的榜樣：

repo = { sha: '4df2b779ddfcb27761c71e00e2b241bfa06a0950', 
     commit: { author: { name: 'asasa asasa', 
           email: '[email protected]', 
           date: '2016-08-06 16:24:04 UTC', 
           sha: '876239789879ab9876c8769287698769876fed' }, 
        committer: { name: 'asasa asasa', 
           email: '[email protected]', 
           date: '2016-08-06 16:26:45 UTC' }, 
        message: "applies new string literal convention in activerecord/lib\n\nThe current code base is not uniform. After some discussion,\nwe have chosen to go with double quotes by default.", 
        tree: { sha: '7a83cce62195f7b20afea6d6a8873b953d25cb84', 
          url: 'https://api.github.com/repos/rails/rails/git/trees/7a83cce62195f7b20afea6d6a8873b953d25cb84' }, 
        url: 'https://api.github.com/repos/rails/rails/git/commits/4df2b779ddfcb27761c71e00e2b241bfa06a0950', 
        comment_count: 0 }, 
     url: 'https://api.github.com/repos/rails/rails/commits/4df2b779ddfcb27761c71e00e2b241bfa06a0950', 
     html_url: 'https://github.com/rails/rails/commit/4df2b779ddfcb27761c71e00e2b241bfa06a0950', 
     comments_url: 'https://api.github.com/repos/rails/rails/commits/4df2b779ddfcb27761c71e00e2b241bfa06a0950/comments' } 

p find_value_in_nested_hash(repo, '876239789879ab9876c8769287698769876fed') 
#=> {:name=>"asasa asasa", :email=>"[email protected]", :date=>"2016-08-06 16:24:04 UTC", :sha=>"876239789879ab9876c8769287698769876fed"}

來源

2017-03-09 09:43:22

如何在嵌套散列中搜索特定鍵的值？

回答

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