Object Construction with nested m:n structure in jq - jq

Question

I have this json
{
"objectEntries": [
{
"objectType": {
"name": "Test"
},
"attributes": [
{
"id": 16,
"objectTypeAttributeId": 8,
"objectAttributeValues": [
{
"referencedObject": {
"id": 17,
"label": "TestTest",
"attributes": [
{
"id": 20,
"objectTypeAttributeId": 11,
"objectAttributeValues": [
{
"value": "bli"
}
],
"objectId": 12
},
{
"id": 21,
"objectTypeAttributeId": 13,
"objectAttributeValues": [
{
"value": "blo"
}
],
"objectId": 14
},
{
"id": 22,
"objectTypeAttributeId": 15,
"objectAttributeValues": [
{
"referencedObject": {
"id": 30,
"label": "TestTest",
"attributes": [
{
"id": 35,
"objectTypeAttributeId": 36,
"objectAttributeValues": [
{
"value": "bli"
}
],
"objectId": 37
},
{
"id": 38,
"objectTypeAttributeId": 39,
"objectAttributeValues": [
{
"value": "blo"
}
],
"objectId": 40
}
]
}
}
],
"objectId": 16
}
]
}
}
]
},
{
"id": 16,
"objectTypeAttributeId": 8,
"objectAttributeValues": [
{
"referencedObject": {
"id": 17,
"label": "TestTest",
"attributes": [
{
"id": 20,
"objectTypeAttributeId": 11,
"objectAttributeValues": [
{
"value": "bli"
}
],
"objectId": 12
},
{
"id": 21,
"objectTypeAttributeId": 13,
"objectAttributeValues": [
{
"value": "blo"
}
],
"objectId": 14
},
{
"id": 22,
"objectTypeAttributeId": 15,
"objectAttributeValues": [
{
"referencedObject": {
"id": 30,
"label": "TestTest",
"attributes": [
{
"id": 35,
"objectTypeAttributeId": 36,
"objectAttributeValues": [
{
"value": "xxx"
}
],
"objectId": 37
},
{
"id": 38,
"objectTypeAttributeId": 39,
"objectAttributeValues": [
{
"value": "yyy"
}
],
"objectId": 40
}
]
}
}
],
"objectId": 16
}
]
}
}
]
}
]
}
]
}
I want this result.
{
"name": "Test",
"attribute36": "bli",
"attribute39": "blo"
}
{
"name": "Test",
"attribute36": "xxx",
"attribute39": "yyy"
}
But what I get is this
{
"name": "Test",
"attribute36": "bli",
"attribute39": "blo"
}
{
"name": "Test",
"attribute36": "bli",
"attribute39": "yyy"
}
{
"name": "Test",
"attribute36": "xxx",
"attribute39": "blo"
}
{
"name": "Test",
"attribute36": "xxx",
"attribute39": "yyy"
}
The jq query I came up with
jq '.objectEntries[] | {"name": .objectType.name, "attribute36": .attributes | .[] | select(.objectTypeAttributeId==8) | .objectAttributeValues[].referencedObject.attributes | .[] | select(.objectTypeAttributeId==15) | .objectAttributeValues[].referencedObject.attributes | .[] | select(.objectTypeAttributeId==36) | .objectAttributeValues | .[] | .value, "attribute39": .attributes | .[] | select(.objectTypeAttributeId==8) | .objectAttributeValues[].referencedObject.attributes | .[] | select(.objectTypeAttributeId==15) | .objectAttributeValues[].referencedObject.attributes | .[] | select(.objectTypeAttributeId==39) | .objectAttributeValues | .[] | .value}' stackoverflow.json
You can see the problem also on jqplay https://jqplay.org/s/NjqEy7wvQE
The goal is to extract certain fields on the different jsonpath depths into a new, flat json object, per toplevel json object, where toplevel are the objects under objectEntries[]

Answer 1

Looking at the jq query in the Q, we can define two useful functions:
def attributes:
[ .attributes[]
| select(.objectTypeAttributeId==8)
| .objectAttributeValues[].referencedObject.attributes[]
| select(.objectTypeAttributeId==15)
| .objectAttributeValues[].referencedObject.attributes[] ] ;
def to_o:
{ ("attribute" + (.objectTypeAttributeId|tostring)): first(.objectAttributeValues[].value)};
And we see that
.objectEntries[] | attributes[] | to_o
yields:
{"attribute36":"bli"}
{"attribute39":"blo"}
{"attribute36":"xxx"}
{"attribute39":"yyy"}
This is where the original question becomes a bit difficult to understand. I'm going to assume the intent is to group these objects together without loss of information and without introducing arrays.
At any rate, the following filter does produce the desired result:
.objectEntries[]
| .objectType.name as $name
| foreach ((attributes[] | to_o), null ) as $o ({};
if $o == null then .emit = .object
elif .object|has($o|keys_unsorted[0])
then .emit=.object | .object=$o
else .emit=null | .object += $o
end;
select(.emit) | .emit)
| {$name} + .