r - 将 JSON 列添加到 R 数据框

Question

我有一个数据框，想添加一个额外的列，其中包含 JSON 格式的每行数据。 在这个例子中:

dfr = data.frame(name = c("Andrew", "Mathew", "Dany", "Philip", "John", "Bing", "Monica"), age = c(28, 23, 49, 29, 38, 23, 29))

dfr %>% mutate(Payload = jsonlite::toJSON(dfr))

我想得到

Andrew  28   {"name":"Andrew","age":28}
Mathew  23   {"name":"Mathew","age":23}

相反，我每行获取完整数据框的 JSON 字符串。 我用 apply 试过了，但没能运行。

Answer 1

尝试按每一行运行:拆分每一行，然后应用 toJSON 函数:

dfr$Payload <- sapply(split(dfr, seq(nrow(dfr))), toJSON)

dfr
#     name age                      Payload
# 1 Andrew  28 [{"name":"Andrew","age":28}]
# 2 Mathew  23 [{"name":"Mathew","age":23}]
# 3   Dany  49   [{"name":"Dany","age":49}]
# 4 Philip  29 [{"name":"Philip","age":29}]
# 5   John  38   [{"name":"John","age":38}]
# 6   Bing  23   [{"name":"Bing","age":23}]
# 7 Monica  29 [{"name":"Monica","age":29}]