Jolt to check non-null value and then add a new field - json

Question

Below is the json input file.
{
"data": {
"no1": 12345,
"cp1": {
"cp1_sub1": "sub1",
"cp2_sub2": "sub2"
},
"cp2": null
}
}
the expectation is like adding a "no1" field inside the "cp1" and "cp2" if it is non-null object.
I have tried with following 2 ways but non of it is working. Is there any way to check null or add a null value with a new key in jolt?
Try 1:
[
{
"operation": "shift",
"spec": {
"data": {
"*": "data.&",
"cp1": {
"#(1,no1)": "data.cp1.no1",
"*": "data.cp1.&"
},
"cp2": {
"#(1,no1)": "data.cp2.no1",
"*": "data.cp2.&"
}
}
}
}
]
Here the problem is it adds "no1" in "cp2".
Try 2:
[
{
"operation": "shift",
"spec": {
"data": {
"*": "data.&",
"cp1": {
"#(1,no1)": "data.cp1.no1",
"*": "data.cp1.&"
},
"cp2": {
"*": {
"#(1,no1)": "data.cp2.no1",
"*": "data.cp2.&"
}
}
}
}
}
]
Here the problem is "cp2" it self removed. If this is correct then how we can add back "cp2": null
If the input is an array like this.
{
"abc": "def",
"data": [
{
"no1": 12345,
"cp1": {
"cp1_sub1": "sub1",
"cp2_sub2": "sub2"
},
"cp2": null
},
{
"no1": 56789,
"cp1": null,
"cp2": {
"cp3_sub1": "sub1",
"cp3_sub2": "sub2"
}
}
]
}
I tried with the same way with #Barbaros answer. but the last step is not working for the array part. Considering cp1 and cp2 as the fixed key and not a dynamic.
[
{
// multiplex the current JSON value in order to use one for logical comparisons later
"operation": "shift",
"spec": {
"data": {
"*": {
"*": "data.[&1].&",
"#(0,cp1)": "data.[&1].temp-cp1",
"#(0,cp2)": "data.[&1].temp-cp2"
}
}
}
},
{
// determine whether the value of the attribute/object is "null"
"operation": "modify-overwrite-beta",
"spec": {
"data": {
"*": {
"temp-cp1": ["=toString", "NuLllLL"],
"temp-cp2": ["=toString", "NuLllLL"]
}
}
}
}
]

Answer 1

We should generate a comparison identifier in order to be prepared for upcoming conditional which will be held within a consequent transformation
[
{
// multiplex the current JSON value in order to use one for logical comparisons later
"operation": "shift",
"spec": {
"data": {
"*": "&1.&",
"#": "New_&1.&"
}
}
},
{
// determine whether the value of the attribute/object is "null"
"operation": "modify-overwrite-beta",
"spec": {
"New_data": {
"data": {
"cp*": ["=toString", "NuLllLL"]
}
}
}
},
{
// use conditional logic based on the results determined within the previous transformation
"operation": "shift",
"spec": {
"New_data": {
"data": {
"cp*": {
"NuLllLL": {
"#(4,data.&1)": "&3.&2"
},
"*": {
"#1": "&3.&2.new_&2",
"#(4,data.no1)": "&3.&2.no1"
},
"*}": { // check out if it's an object
"#(4,data.&1)": "&3.&2",
"#(4,data.no1)": "&3.&2.no1"
}
},
"*": "&1.&"
}
}
}
}
]
the demo on the site http://jolt-demo.appspot.com/ is