select elements of an array and update it in-place - json

Question

Given the following JSON,
I'm trying to filter out items in the cars array where the item's comments array is null:
.cars[] | select(.comments == null)
or the item's comments array exists and any of the comments objects don't contain the value "FooBar"
.cars[] | select( select(.comments != null) | (any(.comments[]; index("FooBar")) | not) )
while retaining the original structure.
With jq I can figure out how to create the critera I want to filter down to but what I can't wrap my head around is how to make that apply to the top level items.
JSON input:
{
"person": {
"first_name": "Bob",
"last_name": "Smith"
},
"addresses": [
{
"home": {
"line1": "123",
"line2": "A st."
}
},
{
"work": {
"line1": "456",
"line2": "B st."
}
}
],
"cars": [
{
"make": "Honda",
"model": "Civic"
},
{
"make": "Honda",
"model": "Accord"
},
{
"make": "Honda",
"model": "Pilot",
"comments": [
"Comment 1",
"Comment 2",
"FooBar"
]
},
{
"make": "Honda",
"model": "Passport",
"comments": [
"Comment 3",
"Comment 4"
]
}
]
}
JSON Outut, same as the input but the oject with the comment array containg the value "FooBar" is filtered out:
{
"person": {
"first_name": "Bob",
"last_name": "Smith"
},
"addresses": [
{
"home": {
"line1": "123",
"line2": "A st."
}
},
{
"work": {
"line1": "456",
"line2": "B st."
}
}
],
"cars": [
{
"make": "Honda",
"model": "Civic"
},
{
"make": "Honda",
"model": "Accord"
},
{
"make": "Honda",
"model": "Passport",
"comments": [
"Comment 3",
"Comment 4"
]
}
]
}

Answer 1

Just use the update-assignment operator (|=).
.cars |= map(select(.comments))
.cars |= map(select(.comments and any(.comments[]; index("FooBar")) | not))