JQ - Groupby and concatenate text objects - json

Question

Not quite getting it. I can produce multiple lines but cannot get multiple entries to combine. Looking to take Source JSON and output to CSV as shown:
Source JSON:
[{"State": "NewYork","Drivers": [
{"Car": "Jetta","Users": [{"Name": "Steve","Details": {"Location": "Home","Time": "9a-7p"}}]},
{"Car": "Jetta","Users": [{"Name": "Roger","Details": {"Location": "Office","Time": "3p-6p"}}]},
{"Car": "Ford","Users": [{"Name": "John","Details": {"Location": "Home","Time": "12p-5p"}}]}
]}]
Desired CSV:
"NewYork","Jetta","Steve;Roger","Home;Office","9a-7p;3p-6p"
"NewYork","Ford","John","Home","12p-5p"
JQ code that does not work:
.\[\] | .Drivers\[\] | .Car as $car |
.Users\[\] |
\[$car, .Name\] | #csv

Answer 1

You're looking for something like this:
.[] | [.State] + (
.Drivers | group_by(.Car)[] | [.[0].Car] + (
map(.Users) | add | [
map(.Name),
map(.Details.Location),
map(.Details.Time)
] | map(join(";"))
)
) | #csv
$ jq -r -f tst.jq file
"NewYork","Ford","John","Home","12p-5p"
"NewYork","Jetta","Steve;Roger","Home;Office","9a-7p;3p-6p"
$

Answer 2

Not quite optimised, but I though't I'd share the general idea:
jq -r 'map(.State as $s |
(.Drivers | group_by(.Car))[]
| [
$s,
(map(.Users[].Name) | join(";")),
(map(.Users[].Details.Location) | join(";")),
(map(.Users[].Details.Time) | join(";"))
])
[] | #csv' b
map() over each state, remember the name (map(.State as $s | )
group_by(.Car)
Create an array containing all your fields that is passed to #csv
Use map() and join() to create the fields for Name, Location and Time
This part could be improved so you don't need that duplicated part
Output (with --raw-output:
"NewYork","John","Home","12p-5p"
"NewYork","Steve;Roger","Home;Office","9a-7p;3p-6p"
JqPlay seems down, so I'm still searching for an other way of sharing a public demo

Answer 3

Far from perfect, but it builds the result incrementally so it should be easily debuggable and extensible:
map({State} + (.Drivers[] | {Car} + (.Users[] | {Name} + (.Details | {Location, Time}))))
| group_by(.Car)
| map(reduce .[] as $item (
{State:null,Car:null,Name:[],Location:[],Time:[]};
. + ($item | {State,Car}) | .Name += [$item.Name] | .Location += [$item.Location] | .Time += [$item.Time]))
| .[]
| [.State, .Car, (.Name,.Location,.Time|join(","))]
| #csv