我有一些 JSON。它看起来像这样:
{
"Volumes": [
{
"Attachments": [
{
"VolumeId": "vol-11111111",
"State": "attached",
"DeleteOnTermination": false,
"Device": "/dev/sdz"
}
],
"Tags": [
{
"Value": "volume1",
"Key": "Name"
},
{
"Value": "00:00",
"Key": "Start"
},
{
"Value": "00:20",
"Key": "Finish"
},
{
"Value": "2",
"Key": "Period"
}
],
"VolumeId": "vol-11111111"
},
{
"Attachments": [
{
"VolumeId": "vol-22222222",
"State": "attached",
"DeleteOnTermination": false,
"Device": "/dev/sdz"
}
],
"Tags": [
{
"Value": "volume2",
"Key": "Name"
},
{
"Value": "00:00",
"Key": "Start"
},
{
"Value": "00:20",
"Key": "Finish"
},
{
"Value": "2",
"Key": "Period"
}
],
"VolumeId": "vol-22222222"
},
{
"Attachments": [
{
"VolumeId": "vol-333333333",
"State": "attached",
"DeleteOnTermination": false,
"Device": "/dev/sdz"
}
],
"Tags": [
{
"Value": "volume3",
"Key": "Name"
},
{
"Value": "00:00",
"Key": "Start"
},
{
"Value": "00:20",
"Key": "Finish"
},
{
"Value": "2",
"Key": "Period"
}
],
"VolumeId": "vol-33333333"
}
]
}
使用 jq,我能够提取以下信息:
VolumeId,Finish,Start,Period
使用 jq 命令
cat json | jq -r '[.Volumes[]|({VolumeId}+(.Tags|from_entries))|{VolumeId,Finish,Start,Period}]'
[
{
"VolumeId": "vol-11111111",
"Finish": "00:20",
"Start": "00:00",
"Period": "2"
},
{
"VolumeId": "vol-22222222",
"Finish": "00:20",
"Start": "00:00",
"Period": "2"
},
{
"VolumeId": "vol-33333333",
"Finish": "00:20",
"Start": "00:00",
"Period": "2"
}
]
所有这些工作正常。但是我需要额外提取 .Attachments.Device。我正在为每个数组寻找类似于以下内容的输出:
[
{
"VolumeId": "vol-11111111",
"Finish": "00:20",
"Start": "00:00",
"Period": "2",
"DeviceId": "/dev/sdz"
},
{
"VolumeId": "vol-22222222",
"Finish": "00:20",
"Start": "00:00",
"Period": "2",
"DeviceId": "/dev/sdz"
},
{
"VolumeId": "vol-33333333",
"Finish": "00:20",
"Start": "00:00",
"Period": "2",
"DeviceId": "/dev/sdz"
}
]
但是,我无法弄清楚如何在不出错的情况下执行此操作。对我来说最合乎逻辑的方法是做这样的事情:
cat json | jq -r '[.Volumes[]|({VolumeId}+(.Attachments|from_entries)+(.Tags|from_entries))|{VolumeId,Finish,Start,Period,DeviceId}]'
但是我收到错误:
jq: error (at <stdin>:91): Cannot use null (null) as object key
任何帮助弄清楚我做错了什么以及如何解决它的帮助将不胜感激。
谢谢
最佳答案
最终,问题是您在 from_entries
数组上使用 Attachments
时它不起作用。 from_entries
使用一组键/值对对象来创建具有这些值的对象。但是,您没有键/值对,而是对象。如果您只是想将它们组合起来,则应该使用 add
。
此外,没有名为 DeviceId
的属性,它是 Device
。如果要选择 Device
属性并将其作为 DeviceId
获取,则需要提供正确的名称。
.Volumes | map(
({ VolumeId } + (.Attachments | add) + (.Tags | from_entries))
| { VolumeId, Finish, Start, Period, DeviceId: .Device }
)
关于json - jq - 将额外的 JSON 对象提取到新数组中,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/36393805/