Transform Object into array containing the Object - jolt

Question

I would like to wrap an object into an array using JoLT specification, for further use in NiFi.
But I cannot seem to get the solution.
Let's say I have this json as input
{
"toIndex": [
{
"content": [
{
"firstName": "maxime",
"lastName": "g",
"toArray": {
"one": "fun",
"two": "funfun",
"three": "funfunfun"
}
}
]
},
{
"content": [
{
"firstName": "monica",
"lastName": "beluci",
"toArray": {
"one": "fun",
"two": "funfun",
"three": "funfunfun"
}
}
]
}
]
}
I would very much like to get this as output :
{
"toIndex": [
{
"content": [
{
"firstName": "maxime",
"lastName": "g",
"toArray": [ {
"one": "fun",
"two": "funfun",
"three": "funfunfun"
}]
}
]
},
{
"content": [
{
"firstName": "monica",
"lastName": "beluci",
"toArray": [{
"one": "fun",
"two": "funfun",
"three": "funfunfun"
}]
}
]
}
]
}
Unfortunately I get this output :
{
"toIndex" : [ {
"content" : [ {
"firstName" : "maxime",
"lastName" : "g",
"toArray" : {
"one" : "fun",
"two" : "funfun",
"three" : "funfunfun"
}
}, {
"toArray" : [ {
"one" : "fun",
"two" : "funfun",
"three" : "funfunfun"
} ]
}, {
"firstName" : "monica",
"lastName" : "beluci",
"toArray" : {
"one" : "fun",
"two" : "funfun",
"three" : "funfunfun"
}
}, {
"toArray" : [ {
"one" : "fun",
"two" : "funfun",
"three" : "funfunfun"
} ]
} ]
} ]
}
My (miserable) spec goes like this :
[{
"operation": "shift",
"spec": {
"toIndex": {
"*": {
"content": {
"*": {
"#": "toIndex[&1].content[]", // passthru
"toArray": "toIndex[&1].content[].toArray[]"
}
}
}
}
}
}
]
If one of you be so kind as to indicate what I am doing wrong...
Thanks.

Answer 1

See if the cardinality operation is what you are looking for:
[
{
"operation": "cardinality",
"spec": {
"toIndex": {
"*": {
"content": {
"*": {
"toArray": "MANY"
}
}
}
}
}
}
]
Output
{
"toIndex" : [ {
"content" : [ {
"firstName" : "maxime",
"lastName" : "g",
"toArray" : [ {
"one" : "fun",
"two" : "funfun",
"three" : "funfunfun"
} ]
} ]
}, {
"content" : [ {
"firstName" : "monica",
"lastName" : "beluci",
"toArray" : [ {
"one" : "fun",
"two" : "funfun",
"three" : "funfunfun"
} ]
} ]
} ]
}