Merge objects in same array on single key - json

Question

I have an array of JSON objects formatted as follows:
[
{
"id": 1,
"names": [
{
"name": "Bulbasaur",
"language": {
"name": "en",
"url": "http://myserver.com:8000/api/v2/language/9/"
}
},
],
},
{
"id": 1,
"types": [
{
"slot": 1,
"type": {
"name": "grass",
"url": "http://myserver.com:8000/api/v2/type/12/"
}
},
{
"slot": 2,
"type": {
"name": "poison",
"url": "http://myserver.com:8000/api/v2/type/4/"
}
}
]
},
{
"id": 2,
"names": [
{
"name": "Ivysaur",
"language": {
"name": "en",
"url": "http://myserver.com:8000/api/v2/language/9/"
}
},
],
},
{
"id": 2,
"types": [
{
"slot": 1,
"type": {
"name": "ice",
"url": "http://myserver.com:8000/api/v2/type/10/"
}
},
{
"slot": 2,
"type": {
"name": "electric",
"url": "http://myserver.com:8000/api/v2/type/8/"
}
}
]
},
{
"id": 3,
"names": [
{
"name": "Venusaur",
"language": {
"name": "en",
"url": "http://myserver.com:8000/api/v2/language/9/"
}
},
],
},
{
"id": 3,
"types": [
{
"slot": 1,
"type": {
"name": "ground",
"url": "http://myserver.com:8000/api/v2/type/2/"
}
},
{
"slot": 2,
"type": {
"name": "rock",
"url": "http://myserver.com:8000/api/v2/type/3/"
}
}
]
}
]
Note that these are pairs of separate objects that appear sequentially in a JSON array, with each pair sharing an id field. This pattern repeats several hundred times in the array. What I need to accomplish is to "merge" each id-sharing pair into one object. So, the resultant output would be
[
{
"id": 1,
"names": [
{
"name": "Bulbasaur",
"language": {
"name": "en",
"url": "http://myserver.com:8000/api/v2/language/9/"
}
},
],
"types": [
{
"slot": 1,
"type": {
"name": "grass",
"url": "http://myserver.com:8000/api/v2/type/12/"
}
},
{
"slot": 2,
"type": {
"name": "poison",
"url": "http://myserver.com:8000/api/v2/type/4/"
}
}
]
},
{
"id": 2,
"names": [
{
"name": "Ivysaur",
"language": {
"name": "en",
"url": "http://myserver.com:8000/api/v2/language/9/"
}
},
],
"types": [
{
"slot": 1,
"type": {
"name": "ice",
"url": "http://myserver.com:8000/api/v2/type/10/"
}
},
{
"slot": 2,
"type": {
"name": "electric",
"url": "http://myserver.com:8000/api/v2/type/8/"
}
}
]
},
{
"id": 3,
"names": [
{
"name": "Venusaur",
"language": {
"name": "en",
"url": "http://myserver.com:8000/api/v2/language/9/"
}
},
],
"types": [
{
"slot": 1,
"type": {
"name": "ground",
"url": "http://myserver.com:8000/api/v2/type/2/"
}
},
{
"slot": 2,
"type": {
"name": "rock",
"url": "http://myserver.com:8000/api/v2/type/3/"
}
}
]
}
]
I've gotten these objects to appear next to each other via the group_by(.id) command, but I'm at a loss as to how I should actually combine them. I'm very much still a novice with jq so I'm a bit overwhelmed with the amount of possible solutions.

Answer 1

[Note: The following assumes that the data shown in the Q have been corrected so that they are valid JSON.]
The merging you want can be achieved by object addition (x + y). For example, given the two JSON objects as shown in the question (i.e., as a stream), you could write:
jq -s '.[0] + .[1]'
However, since the question also indicates these objects are actually in an array, let's next consider the case of an array with two objects. In that case, you could simply write:
jq add
Finally, if you have an array of arrays each of which is an array of objects, you could use map(add). Since you don't have a very large array, you could simply write:
group_by(.id) | map(add)
Please note that jq defines object addition in a non-commutative way. Specifically, there is a bias towards the right-most key.