Extracting list of values from a list of list of dictionaries

Archives Ansible Project
1

Hello,

I have a command running a loop through with items and I get a registered result like the following structure:

{
    "changed": false,
    "msg": "All items completed",
    "results": [
        {
            "machines": [
                {
                    "ip": "127.0.0.1",
                    "name": "machine1"
                },
                {
                    "ip": "127.0.0.1",
                    "name": "machine2"
                }
            ]
        },
        {
            "machines": [
                {
                    "ip": "127.0.0.1",
                    "name": "machine3"
                },
                {
                    "ip": "127.0.0.1",
                    "name": "machine4"
                }
            ]
        }
    ]
}

I wanted to extract a list of machines.name out of it so I used the following filter:

map(attribute="machines.name")

And I got a list of Undefined as an output:

`
“[Undefined, Undefined]”: “[Undefined, Undefined]”

`

How can I correctly extract a list of machine names out of that data structure?