jq - add new field with updating whole file - json

Question

I have json file which is constructed in simmilar way:
[
{
"_id":"1234",
"org":"org1",
"int":
{"url":"http://url.com.uk:1234"}},
{
"_id":"4321",
"org":"org2",
"int":
{"url":"http://url.com.us:4321"}},
...
]
Now im "jumping" from one entry to another and checking if under URL application is working properly. After check i want to add/update field "status". But i can't update whole file, im just getting:
$ jq --arg mod "GOOD" '.[0].int + {stat: $mod}' tmp.json
{
"url": "http://url.com.uk:1234",
"stat": "GOOD"
}
How can i with jq command get new updated whole file, not just only part of it?

Answer 1

If you put your data in data.json and the changes you want to make to
each record into a separate arg.json argument file like
{
"1234": { "int": { "stat": "GOOD" } },
"4321": { "int": { "stat": "BAD", "xxx": "yyy" } }
}
and run jq as
$ jq -M --argfile arg arg.json 'map(. + $arg[._id])' data.json
then it will output the updated data, e.g.
[
{
"_id": "1234",
"org": "org1",
"int": {
"stat": "GOOD"
}
},
{
"_id": "4321",
"org": "org2",
"int": {
"stat": "BAD",
"xxx": "yyy"
}
}
]
Note that the + replaces keys. If you want to merge keys you can use * e.g.
$ jq -M --argfile arg arg.json 'map(. * $arg[._id])' data.json
which generates
[
{
"_id": "1234",
"org": "org1",
"int": {
"url": "http://url.com.uk:1234",
"stat": "GOOD"
}
},
{
"_id": "4321",
"org": "org2",
"int": {
"url": "http://url.com.us:4321",
"stat": "BAD",
"xxx": "yyy"
}
}
]
If you want to update the data in place you could use sponge
as described in the answer Manipulate JSON with jq
e.g.
$ jq -M --argfile arg arg.json 'map(. * $arg[._id])' data.json | sponge data.json

Answer 2

You can map to array and resign the int by operation, like:
jq --arg mod "GOOD" '.[] | .int=.int + {stat: $mod}' tmp.json
{
"_id": "1234",
"org": "org1",
"int": {
"url": "http://url.com.uk:1234",
"stat": "GOOD"
}
}
{
"_id": "4321",
"org": "org2",
"int": {
"url": "http://url.com.us:4321",
"stat": "GOOD"
}
}