JQ: group by into single object with groups as keys - json

Question

I have the following data:
[
{
"company.u_ats_region": "Region1",
"hostname": "host1",
"install_status": "1",
"os": "Windows",
"os_domain": "test.com"
},
{
"company.u_ats_region": "Region2",
"hostname": "host2",
"install_status": "1",
"os": "Windows",
"os_domain": "test.com"
},
{
"company.u_ats_region": "Region3",
"hostname": "host3",
"install_status": "7",
"os": "Windows",
"os_domain": "test.com"
}
]
And I've been using this query
{count: length,
regions: [group_by(."company.u_ats_region")[] |
{( [0]."company.u_ats_region"): [.[] |
{name: (.hostname+"."+.os_domain),
os: .os}]}]}
to convert the data into the following:
{
"count": 3,
"regions": [
{
"Region1": [
{
"name": "host1.test.com",
"os": "Windows"
}
]
},
{
"Region2": [
{
"name": "host2.test.com",
"os": "Windows"
}
]
},
{
"Region3": [
{
"name": "host3.test.com",
"os": "Windows"
}
]
}
]
}
This is close to what I'm trying to achieve but I would like 'regions' to be a single object with each region being a key within that object like this:
{
"count": 3,
"regions": {
"Region1": [
{
"name": "host1.test.com",
"os": "Windows"
}
],
"Region2": [
{
"name": "host2.test.com",
"os": "Windows"
}
],
"Region3": [
{
"name": "host3.test.com",
"os": "Windows"
}
]
}
}
I have tried playing around with 'add' but that still didn't bring me any closer to the result I'm trying to achieve. Any help is appreciated!

Answer 1

Creating an object with key and value fields, then using from_entries would be one way:
{
count: length,
regions: group_by(."company.u_ats_region")
| map({
key: .[0]."company.u_ats_region",
value: map({name: "\(.hostname).\(.os_domain)", os})
})
| from_entries
}
{
"count": 3,
"regions": {
"Region1": [
{
"name": "host1.test.com",
"os": "Windows"
}
],
"Region2": [
{
"name": "host2.test.com",
"os": "Windows"
}
],
"Region3": [
{
"name": "host3.test.com",
"os": "Windows"
}
]
}
}
Demo

Answer 2

You can define a custom function which performs the grouping and then tranfsorm the result. Using a function avoids having to repeat the selector:
def group_to_obj(f):
group_by(f) | map({key:first|f, value:.}) | from_entries;
{
count: length,
regions: group_to_obj(."company.u_ats_region")
| map_values(map({name: "\(.hostname).\(.os_domain)", os}))
}
Output:
{
"count": 3,
"regions": {
"Region1": [
{
"name": "host1.test.com",
"os": "Windows"
}
],
"Region2": [
{
"name": "host2.test.com",
"os": "Windows"
}
],
"Region3": [
{
"name": "host3.test.com",
"os": "Windows"
}
]
}
}

Answer 3

Using reduce to iteratively build up the arrays would be another way:
{
count: length,
regions: (
reduce .[] as $i ({};
.[$i."company.u_ats_region"] += [$i | {name: "\(.hostname).\(.os_domain)", os}]
)
)
}
{
"count": 3,
"regions": {
"Region1": [
{
"name": "host1.test.com",
"os": "Windows"
}
],
"Region2": [
{
"name": "host2.test.com",
"os": "Windows"
}
],
"Region3": [
{
"name": "host3.test.com",
"os": "Windows"
}
]
}
}
Demo