使用 jq 处理数组中的 JSON 个数组

Processing JSON of arrays in array with jq

环境:JQ 1.5,Windows 64 位。

我有以下 JSON:

{
  "unique": 1924,
  "coordinates": [
    {
      "time": "2015-01-25T00:00:01.683",
      "xyz": [
        {
          "z": 4,
          "y": 2,
          "x": 1,
          "id": 99
        },
        {
          "z": 9,
          "y": 9,
          "x": 8,
          "id": 100
        },
        {
          "z": 9,
          "y": 6,
          "x": 10,
          "id": 101
        }
      ]
    },
    {
      "time": "2015-01-25T00:00:02.790",
      "xyz": [
        {
          "z": 0,
          "y": 3,
          "x": 7,
          "id": 99
        },
        {
          "z": 4,
          "y": 6,
          "x": 2,
          "id": 100
        },
        {
          "z": 2,
          "y": 9,
          "x": 51,
          "id": 101
        }
      ]
    }
  ]
}

并想用 jq 将其转换成这种 CSV 格式:

unique,time,id,x,y,z
1924,"2015-01-25T00:00:01.683",99,1,2,4
1924,"2015-01-25T00:00:01.683",100,8,9,9

(以此类推)

我尝试了一些东西,例如:

jq -r '{unique: .unique, coordinates: .coordinates[].xyz[] | [.id, .x, .y, .z], time: .coordinates.[].time} | flatten | @csv' 

这给了我我想要的 JSON,但每个 id、x、y 和 z 都相乘(即每个唯一行出现四次 - id、x、y、z 各出现一次)。

给数组赋一个数,如

jq -r '{unique: .unique, coordinates: .coordinates[0].xyz[] | [.id, .x, .y, .z], time: .coordinates.[0].time} | flatten | @csv' 

给了我 coordinates 数组的第一个索引,但我自然想要所有索引。

第一步是将结果压平成行。

[{ unique } + (.coordinates[] | { time } + .xyz[])]

这将产生每行对象数组:

[
  {
    "unique": 1924,
    "time": "2015-01-25T00:00:01.683",
    "id": 99,
    "x": 1,
    "y": 2,
    "z": 4
  },
  {
    "unique": 1924,
    "time": "2015-01-25T00:00:01.683",
    "id": 100,
    "x": 8,
    "y": 9,
    "z": 9
  },
  {
    "unique": 1924,
    "time": "2015-01-25T00:00:01.683",
    "id": 101,
    "x": 10,
    "y": 6,
    "z": 9
  },
  {
    "unique": 1924,
    "time": "2015-01-25T00:00:02.790",
    "id": 99,
    "x": 7,
    "y": 3,
    "z": 0
  },
  ...
]

然后只需将其转换为 csv 行即可。

["unique","time","id","x","y","z"] as $fields | $fields, (.[] | [.[$fields[]]]) | @csv