jq - replace some variables in array - json

Question

This question is caused due to nomad behaviour
I have an json like this:
# cat test.json
{
"Name": "test",
"TaskGroups": [
{
"Name": "test1",
"Count": 1
},
{
"Name": "test2",
"Count": 1
},
{
"Name": "test3",
"Count": 1
},
{
"Name": "test4",
"Count": 1
},
{
"Name": "test5",
"Count": 1
}
]
}
I need to change it like this:
1) add "Job" in front of my json - I can do it with
# cat test.json | jq '{"Job": .}'
2) replace "Count" variable for multiple items in array, like test1 and test5, I can do it like this:
# cat test.json | jq ' .TaskGroups[0,4].Count = 0 '
I can run both commands as whole thing and it works fine like this:
# cat test.json | jq ' .TaskGroups[0,4].Count = 0 | {"Job": .} '
But also I want to search for variables I want to change by their names, not by their number in array. So I can do something like this:
cat test.json | jq ' .TaskGroups[] | select(.Name == ("test1", "test5")).Count = 0 '
But because of I am listing array, not whole json - I am loosing some variables and "Job:", that I just added. Or I can add it to the every item in my array.
So how I can change variable by its name and also add "Job:" at the same time?

Answer 1

You can use the |= "update-assignment" operator with the following syntax :
(.TaskGroups[] | select(.Name == ("test1", "test5")).Count) |= 0 | {Job : . }
It is documented here.
I've been able to successfully test it on jqplay : https://jqplay.org/s/578mkUAklU