Ruby 如何从这个JSON中提取?
我试图从这个JSON中提取数据,但是当我键入[0]时,它返回“{”&如果我键入[“tweets0”],我什么也得不到。我是否遗漏了一些非常明显的东西 我使用的是Ruby&多json gem,如果这改变了什么的话Ruby 如何从这个JSON中提取?,ruby,json,Ruby,Json,我试图从这个JSON中提取数据,但是当我键入[0]时,它返回“{”&如果我键入[“tweets0”],我什么也得不到。我是否遗漏了一些非常明显的东西 我使用的是Ruby&多json gem,如果这改变了什么的话 { "tweets0": [ { "content": "Test1", "time": "2015/08/16 7:43 PM" } ], "tweets1": [
{
"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"
}
]
}
如果[0]返回“{”,这就表明Ruby并没有将JSON视为JSON对象,而是将其视为字符串
也许您需要先
.load()
您的JSON?为什么不使用Ruby内置的标准JSON
库呢
require 'json'
a = JSON.parse(your_json_data)
a["tweets0"] #=> [{"content"=>"Test1", "time"=>"2015/08/16 7:43 PM"}]
一旦您使用MultiJson加载了数据
> 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"}]
要访问阵列的元素,请执行以下操作:
> json['tweets0'].first
=> {"content"=>"Test1", "time"=>"2015/08/16 7:43 PM"}
您可以发布一段用于加载和访问数据的代码片段吗?因为stdlib的
json
库是使用纯ruby实现的,因此速度很慢。multi_-json
尝试使用oj
,然后回退到yajl
,然后是json
。