pair values from different levels selecting one based on neighbor member

问题

I'm trying to go through an array of objects w/ jq and convert that to csv. I can do the some of the selection and to csv part but what I'm struggling with is figuring out how to get the Name tag value of each object.

The json looks like this:

{
  "Groups": [],
  "Instances": [
    {
      "InstanceType": "m5.xlarge",
      "Tags": [
        {
          "Key": "jenkins_slave_type",
          "Value": "demand_ec2 small"
        },
        {
          "Key": "color",
          "Value": "jenkins"
        },
        {
          "Key": "role",
          "Value": "jenkins"
        },
        {
          "Key": "stack",
          "Value": "dev-us-east-1"
        },
        {
          "Key": "Name",
          "Value": "worker-jenkins"
        },
        {
          "Key": "secondary-role",
          "Value": "worker"
        }
      ],
      "VirtualizationType": "hvm",
      "CpuOptions": {
        "CoreCount": 2,
        "ThreadsPerCore": 2
      },
      "CapacityReservationSpecification": {
        "CapacityReservationPreference": "open"
      },
      "HibernationOptions": {
        "Configured": false
      },
      "MetadataOptions": {
        "State": "applied",
        "HttpTokens": "optional",
        "HttpPutResponseHopLimit": 1,
        "HttpEndpoint": "enabled"
      }
    }
  ]
} 
{
  "Groups": [],
  "Instances": [
    {
      "InstanceType": "t2.micro",
      "Tags": [
        {
          "Key": "Description",
          "Value": "test"
        },
        {
          "Key": "Name",
          "Value": "test-connection-cloud-sql"
        }
      ],
      "VirtualizationType": "hvm",
      "CpuOptions": {
        "CoreCount": 1,
        "ThreadsPerCore": 1
      },
      "CapacityReservationSpecification": {
        "CapacityReservationPreference": "open"
      },
      "HibernationOptions": {
        "Configured": false
      },
      "MetadataOptions": {
        "State": "applied",
        "HttpTokens": "optional",
        "HttpPutResponseHopLimit": 1,
        "HttpEndpoint": "enabled"
      }
    }
  ]
}

I can get to the instance type like this:

aws ec2 describe-instances | jq '.Reservations[] | {type: .Instances[].InstanceType}'

but I can't seem to get to the Name value in Tags thats not nested. I've done it this way but its still nested:

aws ec2 describe-instances | jq '.Reservations[] | {type: .Instances[].InstanceType, name: .Instances[].Tags[] | select (.Key == "Name")}'

回答1:

Expand Instances once to avoid a combinatorial explosion. To apply a filter to the result(s) of select, simply write the filter next to it.

.Reservations[].Instances[] | {InstanceType, name: .Tags[] | select(.Key == "Name") .Value}

^{Online demo}

来源：https://stackoverflow.com/questions/62519154/pair-values-from-different-levels-selecting-one-based-on-neighbor-member

标签

json