Jolt spec to transform fields in selective objects - json

Question

For my input json, I need to write a Jolt spec that can modify manager attribute by joining the value & position fields in only the user type object and not the other object type account.
The input could be a list of such objects.
Input:
[
{
"user": {
"userName": "Mike",
"manager": {
"value": "Harvey",
"position": "Director"
}
},
"account": {
"userLogin": "Mike1987",
"status": true
}
},
{
"user": {
"userName": "Alex",
"manager": {
"value": "Daniel",
"position": "President"
}
},
"account": {
"userLogin": "Alex12a",
"status": true
}
}
]
Desired output:
[
{
"user": {
"userName": "Mike",
"managerRef": {
"info": "Harvey_Director"
}
},
"account": {
"userLogin": "Mike1987",
"status": true
}
},
{
"user": {
"userName": "Alex",
"managerRef": {
"info": "Daniel_President"
}
},
"account": {
"userLogin": "Alex12a",
"status": true
}
}
]
Could someone please help in creating the spec for this transformation. Thanks.

Answer 1

You can use a modify transformation spec which contains a concat function such as
[
{
"operation": "modify-overwrite-beta",
"spec": {
"*": {
"user": {
"manager": {
"info": "=concat(#(1,value),'_',#(1,position))"
}
}
}
}
},
{
// get rid of existing attributes within the object
"operation": "remove",
"spec": {
"*": {
"u*": {
"m*": {
"p*|v*": ""
}
}
}
}
}
]
the demo on the site http://jolt-demo.appspot.com/ is
An alternative method which includes a shift transformation as desired, based on the comment would be
[
{
"operation": "shift",
"spec": {
"*": {
"user": {
"*": "[&2].&1.&",
"manager": {
"*": "[&3].&2.&1.info"
}
},
"*": "[&1].&"
}
}
},
{
"operation": "modify-overwrite-beta",
"spec": {
"*": {
"user": {
"manager": {
"info": "=join('_',#(1,&))"
}
}
}
}
}
]
the demo for this case would be :