arrays - jq - 将对象列表转换为汇总对象

Question

我有这样的 JSON 数据:

[
  {
    "tone_id": "anger",
    "score": 0.012,
    "tone_name": "Anger"
  },
  {
    "tone_id": "disgust",
    "score": 0.002,
    "tone_name": "Disgust"
  },
  {
    "tone_id": "fear",
    "score": 0.14,
    "tone_name": "Fear"
  },
  {
    "tone_id": "joy",
    "score": 0.42,
    "tone_name": "Joy"
  }
]

我想使用 将其转换为以下内容jq :

{
  "anger": 0.012,
  "disgust": 0.002,
  "fear": 0.14,
  "joy": 0.42
}

我能做的最好的是:

cat result.json | jq '.[] | { (.tone_id): .score }'

这给出了以下内容:

{
  "anger": 0.012
}
{
  "disgust": 0.002
}
{
  "fear": 0.14
}
{
  "joy": 0.42
}

I know I can easily do this using other methods. Just wanted to know if it's possible using jq one-liner?

Answer 1

单次调用单行:

 jq 'map( {(.tone_id): .score} ) | add'

(你也可以在传递给 .[] | { (.tone_id): .score } 之前用方括号包裹 add——这两种方法是等价的。)