在 R 中解析多行 JSON

Question

我有一个从服务器获得的 JSON 输入，我想将其解析为数据框对象。

结构：

紧凑型

'{"total_rows":2,"offset":0,"rows":[{"id":"1","key":["1001"],"value":{"context":"1001","application_id":"1","cust_assets_total":1550000}},{"id":"2","key":["1001"],"value":{"context":"1001","application_id":"2","cust_assets_total":1550000}}]}'

漂亮的表格

{
  "total_rows": 2,
  "offset": 0,
  "rows": [
    {
      "id": "1",
      "key": [
        "1001"
      ],
      "value": {
        "context": "1001",
        "application_id": "1",
        "cust_assets_total": 1550000
      }
    },
    {
      "id": "2",
      "key": [
        "1001"
      ],
      "value": {
        "context": "1001",
        "application_id": "2",
        "cust_assets_total": 1550000
      }
    }
  ]
}

预期输出：

context application_id cust_assets_total
1001    1              1550000
1001    2              1550000

使用代码：

library(jsonlite)

raw_data <- '{"total_rows":2,"offset":0,"rows":[{"id":"1","key":["1001"],"value":{"context":"1001","application_id":"1","cust_assets_total":1550000}},{"id":"2","key":["1001"],"value":{"context":"1001","application_id":"2","cust_assets_total":1550000}}]}'

temp <-fromJSON(paste(readLines(raw_data),collapse=""))

但这导致了错误：

Error in file(con, "r") : cannot open the connection
In addition: Warning message:
In file(con, "r") :
  cannot open file '{"total_rows":2,"offset":0,"rows":[{"id":"1","key":["1001"],"value":{"context":"1001","application_id":"1","cust_assets_total":1550000}},{"id":"2","key":["1001"],"value":{"context":"1001","application_id":"2","cust_assets_total":1550000}}]}': No such file or directory

Answer 1

如果您将 textConnection 包裹在 "raw_data" 周围，您可以阅读线条，但将其省略更容易：

> temp <-fromJSON(raw_data)
> temp
$total_rows
[1] 2

$offset
[1] 0

$rows
  id  key value.context value.application_id value.cust_assets_total
1  1 1001          1001                    1                 1550000
2  2 1001          1001                    2                 1550000

注意：...此版本的 fromJSON 为您提供了一个 three-element 命名列表。

在 R 中解析多行 JSON

Parse multi line JSON in R

json

r

jsonlite