将嵌套数据转换为不带方括号的 json

Question

我想上传 ndjson 个包含嵌套数据的文件。

我的代码（见下文）结果为

> {"id":284,"attributes":[{"value":{"T3":1,"T4":0}}]}
> {"id":848,"attributes":[{"value":{"T3":2,"T4":0}}]}

上传此数据导致以下错误：Bad Request","detail":"json: cannot unmarshal array into Go struct field UserData.attributes of type map[string]interface {}","

如果没有方括号，上传会成功，但如果没有用 paste0“手工”编写 json，我似乎无法获得正确的格式，即

> {"id":284,"attributes":{"value":{"T3":1,"T4":0}}}
> {"id":848,"attributes":{"value":{"T3":2,"T4":0}}}

auto_unbox 也没有帮助。有什么建议么？非常感谢

代码

con_out <- file("output.json", open = "wb")
set.seed(1234)
data <- data.frame(id = sample(1:1000, 10))
data$value <- data.frame(T3 = sample(1:3, 10, replace = T, prob = c(0.5, 0.25, 0.25)), T4 = 0)
data <- data %>% tidyr::nest(attributes = value)

jsonlite::stream_out(data, con_out)
close(con_out)

编辑：方括号表示列表。但是如果我尝试嵌套数据框，我只能嵌套一层并且“松散” attributes.

con_out <- file("output.json", open = "wb")

set.seed(1234)
data <- data.frame(id = sample(1:1000, 10))
data$value <- data.frame(attribues = data.frame(T3 = sample(1:3, 10, replace = T, prob = c(0.5, 0.25, 0.25))))
jsonlite::stream_out(data, con_out, auto_unbox = T)
close(con_out)

> {"id":284,"value":{"T3":1}}
> {"id":848,"value":{"T3":2}}

Answer 1

列属性包含每行一行的数据框。每个数据框都是一个由方括号组成的行列表。将其转换为列表：

library(jsonlite)
library(tidyverse)

set.seed(1234)
data <- data.frame(id = sample(1:1000, 10))
data$value <- data.frame(T3 = sample(1:3, 10, replace = T, prob = c(0.5, 0.25, 0.25)), T4 = 0)
data <- data %>% tidyr::nest(attributes = value)

data %>%
  mutate(attributes = attributes %>% map(~ {
    .x %>% as.list() %>% map(as.list)
  })) %>%
  toJSON(pretty = TRUE, auto_unbox = TRUE)
#> [
#>   {
#>     "id": 284,
#>     "attributes": {
#>       "value": {
#>         "T3": 1,
#>         "T4": 0
#>       }
#>     }
#>   },
#>   {
#>     "id": 848,
#>     "attributes": {
#>       "value": {
#>         "T3": 2,
#>         "T4": 0
#>       }
#>     }
#>   }

将嵌套数据转换为不带方括号的 json

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