如何访问 json / ruby 中的键值

Question

我有一个这样的 json 文件，我尝试在 html 中显示不同的值：

{
    "testimonials": [
        {
            "office": "Test",
            "authors": "Benjamin",
        },
        {
            "office": "consultant",
            "authors": "Maxime ",
        },
        {
            "office": "DAF",
            "authors": "Alexandre",

        },
        {
            "office": "CEO",
            "authors": "Raphaël",
          },
        {
            "office": "Consultant",
            "authors": "Alexis",
        },
        {
            "office": "CEO,",
            "authors": "Sylvain",
        }
    ]
}

有人可以帮助我，例如，访问显示值 'Alexis'

Answer 1

这是无效的 JSON，因为您的散列中有尾随逗号。如果您修复逗号，缩小 JSON 以使其更易于使用，并将其保存为字符串，那么您可以在 Ruby:

中开始使用它

json = '{"testimonials":[{"office":"Test","authors":"Benjamin"},{"office":"consultant","authors":"Maxime "},{"office":"DAF","authors":"Alexandre"},{"office":"CEO","authors":"Raphaël"},{"office":"Consultant","authors":"Alexis"},{"office":"CEO,","authors":"Sylvain"}]}'

现在将其解析为真正的Ruby对象：

hash = JSON.parse(json)
=> {
    "testimonials" => [
        [0] {
             "office" => "Test",
            "authors" => "Benjamin"
        },
        [1] {
             "office" => "consultant",
            "authors" => "Maxime "
        },
        [2] {
             "office" => "DAF",
            "authors" => "Alexandre"
        },
        [3] {
             "office" => "CEO",
            "authors" => "Raphaël"
        },
        [4] {
             "office" => "Consultant",
            "authors" => "Alexis"
        },
        [5] {
             "office" => "CEO,",
            "authors" => "Sylvain"
        }
    ]
}

这是一个散列，其中包含一个散列数组。您应该使用 Hash and Array.

的标准方法访问它

首先获取散列中唯一键的值，它是一个数组：

array = hash['testimonials']
=> [
    [0] {
         "office" => "Test",
        "authors" => "Benjamin"
    },
    [1] {
         "office" => "consultant",
        "authors" => "Maxime "
    },
    [2] {
         "office" => "DAF",
        "authors" => "Alexandre"
    },
    [3] {
         "office" => "CEO",
        "authors" => "Raphaël"
    },
    [4] {
         "office" => "Consultant",
        "authors" => "Alexis"
    },
    [5] {
         "office" => "CEO,",
        "authors" => "Sylvain"
    }
]

您表示要从索引 4 中获取值：

sub_hash = array[4]
=> {
     "office" => "Consultant",
    "authors" => "Alexis"
}

你想要 return 字符串 Alexis:

string = sub_hash['authors']
=> "Alexis"

或者将它们全部放在一行中：

string = hash['testimonials'][4]['authors']
=> "Alexis"

或者更短的一行：

JSON.parse(json)['testimonials'][4]['authors']
=> "Alexis"

如何访问 json / ruby 中的键值

How to access key, value in json / ruby

ruby

json

ruby-on-rails-3