将R列表转换为JSON [英] Converting R list to JSON
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问题描述
一个简单的问题-我想在R中将列表转换为JSON. 假设这是我的清单:
A simple question - I'd like to convert a list to JSON in R. Let's say this is my list:
listtest = list(
list(section_id = NULL, name = 'name1', slug = 'slug1'),
list(section_id = NULL, name = 'name2', slug = 'slug2'),
list(section_id = NULL, name = 'name3', slug = 'slug3', categories =
list(
list(section_id = NULL, name = 'name31', slug = 'slug31'),
list(section_id = NULL, name = 'name32', slug = 'slug32')
)
)
)
所以我用一个简单的
jsontest = toJSON(listtest, pretty = TRUE, auto_unbox = TRUE)
然后我得到一个像这样的JSON:
Then I get a JSON like this:
[
{
"section_id": {},
"name": "name1",
"slug": "slug1"
},
{
"section_id": {},
"name": "name2",
"slug": "slug2"
},
{
"section_id": {},
"name": "name3",
"slug": "slug3",
"categories": [
{
"section_id": {},
"name": "name31",
"slug": "slug31"
},
{
"section_id": {},
"name": "name32",
"slug": "slug32"
}
]
}
]
但是,在代码的开头和结尾,我得到的是"[]和"]".我该如何摆脱呢?当上传到mongoDB时,它给了我一个错误,但是如果没有括号,它就可以正常工作.
However, at the beginning and end of the code I get '[' and ']'. How can I get rid of this? When uploading to mongoDB it gives me an error whereas without the brackets it works fine.
推荐答案
使用gsub()
jsontest <- gsub(pattern = '^\[', replacement = "", x = jsontest)
jsontest <- gsub(pattern = '\]$', replacement = "", x = jsontest)
结果:
{
"section_id": {},
"name": "name1",
"slug": "slug1"
},
{
"section_id": {},
"name": "name2",
"slug": "slug2"
},
{
"section_id": {},
"name": "name3",
"slug": "slug3",
"categories": [
{
"section_id": {},
"name": "name31",
"slug": "slug31"
},
{
"section_id": {},
"name": "name32",
"slug": "slug32"
}
]
}
仍然为json
类:
> class(jsontest)
[1] "json"
但是也许空白可能会引起一些麻烦.
But maybe the blank space might cause some troubles.
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