Question

我正在尝试从此JSON中提取数据，但是当我输入[0]时，它会返回'{'＆amp;如果我输入[“tweets0”]，我什么也得不到。我错过了一些非常明显的东西吗？

我正在使用Ruby＆amp; MultiJson gem，如果改变了什么。

{
    "tweets0": [
        {
            "content": "Test1",
            "time": "2015/08/16 7:43 PM"
        }
    ],
    "tweets1": [
        {
            "content": "Test2",
            "time": "2015/08/16 7:44 PM"
        }
    ],
    "tweets2": [
        {
            "content": "Test3",
            "time": "2015/08/16 7:44 PM"
        }
    ],
    "tweets3": [
        {
            "content": "Test3",
            "time": "2015/08/16 7:46 PM"
        }
    ],
    "tweets4": [
        {
            "content": "Test",
            "time": "2015/08/16 7:45 PM"
        }
    ],
    "tweets5": [
        {
            "content": "3",
            "time": "2015/08/16 7:48 PM"
        }
    ],
    "tweets6": [
        {
            "content": "3",
            "time": "2015/08/16 7:48 PM"
        }
    ],
    "tweets7": [
        {
            "content": "3213",
            "time": "2015/08/16 7:49 PM"
        }
    ],
    "tweets8": [
        {
            "content": "3213",
            "time": "2015/08/16 7:49 PM"
        }
    ],
    "tweets9": [
        {
            "content": "23",
            "time": "2015/08/16 7:50 PM"
        }
    ],
    "tweets10": [
        {
            "content": "23",
            "time": "2015/08/16 7:49 PM"
        }
    ],
    "tweets11": [
        {
            "content": "3",
            "time": "2015/08/16 7:53 PM"
        }
    ],
    "tweets12": [
        {
            "content": "34",
            "time": "2015/08/16 7:53 PM"
        }
    ],
    "tweets13": [
        {
            "content": "25",
            "time": "2015/08/16 7:53 PM"
        }
    ],
    "tweets14": [
        {
            "content": "right",
            "time": "2015/08/16 7:52 PM"
        }
    ]
}

Answer 1

如果[0]返回＆＃39; {＆＃39;，那表明Ruby并不是将JSON视为JSON对象，而是将其视为字符串。

也许你需要.load()你的JSON？

Answer 2

为什么不使用Ruby内置的标准json库？

require 'json'
a = JSON.parse(your_json_data)
a["tweets0"] #=> [{"content"=>"Test1", "time"=>"2015/08/16 7:43 PM"}]

Answer 3

使用MultiJson

加载数据后

> require 'multi_json'
> json = MultiJson.load('{"tweets0": [{"content": "Test1","time": "2015/08/16 7:43 PM"}]}')
=> {"tweets0"=>[{"content"=>"Test1", "time"=>"2015/08/16 7:43 PM"}]}

然后您可以通过名称访问哈希元素：

> json['tweets0']
=>[{"content"=>"Test1", "time"=>"2015/08/16 7:43 PM"}]

要访问数组的元素：

> json['tweets0'].first
=> {"content"=>"Test1", "time"=>"2015/08/16 7:43 PM"}

如何从这个JSON中提取？

3 个答案: