Transpose JSON in Groovy - groovy

Question

I have a JSON:
{
"range": "'All traffic",
"majorDimension": "ROWS",
"values": [
[
"Date",
"Sessions",
"Leeds",
"Сontact_query",
"wo_Сontact_query"
],
[
"20200107",
"3461",
"15",
"0",
"15"
],
[
"20200115",
"7824",
"43",
"0",
"43"
]
]
}
Elements in values array with index[0] are names for JSON properties. I want to map these names with values starting with index[0+]. Number of values can be different for each index. Mapping should be dynamical, without hard indexing.
I want to get following JSON:
[
{
"Date": "20200107",
"Sessions": "3461",
"Leeds": "15",
"Contact_query": "0",
"wo_Contact_query": "15"
},
{
"Date": "20200115",
"Sessions": "7824",
"Leeds": "43",
"Contact_query": "0",
"wo_Contact_query": "43"
}
]
I successfully did it with kinda weird JOLT config:
[
{
"operation": "shift",
"spec": {
"values": {
"0": null,
"*": {
"*": "[&1].#(2,[0].[&])"
}
}
}
},
{
"operation": "shift",
"spec": {
"0": null,
"*": "[]"
}
}
]
But i want to replace it with Groovy script.
I reached following solution:
def slurped = new JsonSlurper().parseText(text)
def val = slurped.values[0]
def json = slurped.values.collect{
[val, it].transpose().collectEntries()
}
But it also returns values for [0] element which one i should skip:
{
"Date":"Date",
"Sessions":"Sessions",
"Leeds":"Leeds",
"Contact_query":"Contact_query",
"wo_Contact_query":"wo_Contact_query"
}
How can I improve solution?

Answer 1

You can use pop to remove the first value of a collection:
def values = new groovy.json.JsonSlurper().parseText(text).values;
def val = values.pop()
def json = values.collect { [val, it].transpose().collectEntries() }

Answer 2

Another option using head and tail:
def json = new JsonSlurper().parseText(data)
def head = json.values.head() // first element, the "head"
def tail = json.values.tail() // the rest, excluding the head, i.e. "tail"
def result = tail.collect { [head, it].transpose().collectEntries() }