[英]jq - extract additional JSON object into new array
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,完成,开始,周期
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"
}
]
这一切都很好。 但是我需要额外的提取.Attachments.Device。 我正在寻找每个数组的输出类似于:
[
{
"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,如果没有出错,我无法弄清楚如何做到这一点。 对我来说最合乎逻辑的方法是做一些像:
cat json | jq -r '[.Volumes[]|({VolumeId}+(.Attachments|from_entries)+(.Tags|from_entries))|{VolumeId,Finish,Start,Period,DeviceId}]'
但是我得到错误:
jq: error (at <stdin>:91): Cannot use null (null) as object key
任何帮助弄清楚我做的不正确以及如何解决它将非常感激。
谢谢
最终,问题是你在Attachments
数组上使用from_entries
时它不起作用。 from_entries
采用键/值对对象的数组来创建具有这些值的对象。 但是,您没有键/值对,而是对象。 如果您只是尝试将它们组合在一起,则应使用add
。
此外,没有名为DeviceId
属性,它是Device
。 如果要选择Device
属性并将其作为DeviceId
,则需要提供正确的名称。
.Volumes | map(
({ VolumeId } + (.Attachments | add) + (.Tags | from_entries))
| { VolumeId, Finish, Start, Period, DeviceId: .Device }
)
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