ruby-on-rails - 从 JSON 嵌套哈希中提取特定字段

Question

我正在考虑编写一个网络应用程序来抓取 API 并以 JSON 形式返回此信息。

但是，我只关注一个数字，然后是当前价格(在本示例中为“227”)。我如何在 Ruby 中访问它？我不知道从哪里开始。我从来没有处理过这样的文本。

为了便于讨论，假设我将此输出保存到实例变量 @information

{
    "item": {
        "icon": "http://services.runescape.com/m=itemdb_rs/4332_obj_sprite.gif?id=4798",
        "icon_large": "http://services.runescape.com/m=itemdb_rs/4332_obj_big.gif?id=4798",
        "id": 4798,
        "type": "Ammo",
        "typeIcon": "http://www.runescape.com/img/categories/Ammo",
        "name": "Adamant brutal",
        "description": "Blunt adamantite arrow...ouch",
        "current": {
            "trend": "neutral",
            "price": 227
        },
        "today": {
            "trend": "neutral",
            "price": 0
        },
        "day30": {
            "trend": "positive",
            "change": "+1.0%"
        },
        "day90": {
            "trend": "positive",
            "change": "+1.0%"
        },
        "day180": {
            "trend": "positive",
            "change": "+2.0%"
        },
        "members": "true"
    }
}

Answer 1

首先按照这个帖子将这个JSON解析成Hash Parsing a JSON string in Ruby

假设解析的哈希名称是 my_hash 那么下面应该给你价格

my_hash['item']['current']['price']

编辑:

正如你所说，你想把它保存在@information

@information = my_hash['item']['current']['price']