Merge all objects inside an array that share the same key - jq

Question

I'm trying to deduplicate all objects inside the array results that share the same key id, and merge their path arrays.
JSON input:
[
{
"type": "apple",
"results": [
{
"id": "apple1",
"name": "appleName1",
"path": "/some/path/a"
},
{
"id": "apple1",
"name": "appleName1",
"path": "/some/path/b"
},
{
"id": "apple2",
"name": "appleName2",
"path": "/some/path/c"
}
]
},
{
"type": "orange",
"results": [
{
"id": "orange1",
"name": "orangeName1",
"path": "/some/path/a"
},
{
"id": "orange1",
"name": "orangeName1",
"path": "/some/path/b"
},
{
"id": "orange2",
"name": "orangeName2",
"path": "/some/path/c"
}
]
}
]
Expected output:
[
{
"type": "apple",
"results": [
{
"id": "apple1",
"name": "appleName1",
"path": [
"/some/path/a",
"/some/path/b"
]
},
{
"id": "apple2",
"name": "appleName2",
"path": [
"/some/path/c"
]
}
]
},
{
"type": "orange",
"results": [
{
"id": "orange1",
"name": "orangeName1",
"path": [
"/some/path/a",
"/some/path/b"
]
},
{
"id": "orange2",
"name": "orangeName2",
"path": [
"/some/path/c"
]
}
]
}
]
I've managed to get an approximate solution using:
jq '[{type: .[].type, results: .[].results | group_by(.id) | map({id: .[0].id, name: .[0].name, path: (map(.path))})}]'
But my solution produces two additional elements that aren't supposed to be there.
I know there are some similar questions already answered but I didn't manage to get them to work with this example. Any help is appreciated!

Answer 1

You could group_by the .id field, then for each group take the first item and replace its .path field with a map on the .path fields of all group members:
jq 'map(.results |= (group_by(.id) | map(first + {path: map(.path)})))'
[
{
"type": "apple",
"results": [
{
"id": "apple1",
"name": "appleName1",
"path": [
"/some/path/a",
"/some/path/b"
]
},
{
"id": "apple2",
"name": "appleName2",
"path": [
"/some/path/c"
]
}
]
},
{
"type": "orange",
"results": [
{
"id": "orange1",
"name": "orangeName1",
"path": [
"/some/path/a",
"/some/path/b"
]
},
{
"id": "orange2",
"name": "orangeName2",
"path": [
"/some/path/c"
]
}
]
}
]
Demo