How to append/update the objects in a JSON array to another JSON array inside an object - mule

Question

These are my two payloads.I want to add the second payload to first load using DataWave. Someone please help me. I want to add a second payload account to the first account without affecting the remaining data.
payload 1
[
{
"_id" : "7c2a355a-1fca-11ed-861d-0242ac120002",
"accounts" : [
{
//these are some accounts
"account_id" : b206ae7e-1fca-11ed-861d-0242ac120002,
account number : 123456,
current balance : {
$number decimal : "0"
},
daily interest rate : null,
collateral : [
{
"loan collateral id" : 03501efa-1fcb-11ed-861d-0242ac120002,
"model" : car
},
//second account
{
"account_id" : 416535ee-1fcc-11ed-861d-0242ac120002,
account number : 594154,
current balance : {
$number decimal : "0"
},
daily interest rate : null,
collateral : [
{
"loan collateral id" : 416535ee-1fcc-11ed-861d-0242ac120002,
"model" : car
},
//third account
{
"account_id" : 416535ee-1fcc-11ed-861d-0242ac120002,
account number : 258963,
current balance : {
$number decimal : "0"
},
daily interest rate : null,
collateral : [
{
"loan collateral id" : 65736c26-1fcc-11ed-861d-0242ac120002,
"model" : car
},
"related entities" : [
{
"Entity_id" : 8a107a20-1fcb-11ed-861d-0242ac120002,
"shortname" : "name"
"addresses" : [
{
Entity_address_id : ca66ac66-1fcb-11ed-861d-0242ac120002
city : XXX
state : xxx
}
}
]
This is my first payload contains accounts and other information
payload 2 :
{
//first account
"account_id" : 067094ce-1fcc-11ed-861d-0242ac120002,
account number : 464634,
current balance : {
$number decimal : "0"
},
daily interest rate : null,
collateral : [
{
"loan collateral id" : 1c971994-1fcc-11ed-861d-0242ac120002,
"model" : car
},
//second account
{
"account_id" : 24835d3e-1fcc-11ed-861d-0242ac120002,
account number : 14654163,
current balance : {
$number decimal : "0"
},
daily interest rate : null,
collateral : [
{
"loan collateral id" : 03501efa-1fcb-11ed-861d-0242ac120002,
"model" : car
}
final Output :
//this is the final output by combining two payloads
[
{
"_id" : "7c2a355a-1fca-11ed-861d-0242ac120002",
"accounts" : [
{
//first payload
"account_id" : b206ae7e-1fca-11ed-861d-0242ac120002,
account number : 123456,
current balance : {
$number decimal : "0"
},
daily interest rate : null,
collateral : [
{
"loan collateral id" : 03501efa-1fcb-11ed-861d-0242ac120002,
"model" : car
},
//second account
{
"account_id" : 416535ee-1fcc-11ed-861d-0242ac120002,
account number : 594154,
current balance : {
$number decimal : "0"
},
daily interest rate : null,
collateral : [
{
"loan collateral id" : 416535ee-1fcc-11ed-861d-0242ac120002,
"model" : car
},
{
"account_id" : 416535ee-1fcc-11ed-861d-0242ac120002,
account number : 258963,
current balance : {
$number decimal : "0"
},
daily interest rate : null,
collateral : [
{
"loan collateral id" : 65736c26-1fcc-11ed-861d-0242ac120002,
"model" : car
},
{
"account_id" : 067094ce-1fcc-11ed-861d-0242ac120002,
account number : 464634,
current balance : {
$number decimal : "0"
},
daily interest rate : null,
collateral : [
{
"loan collateral id" : 1c971994-1fcc-11ed-861d-0242ac120002,
"model" : car
},
{
"account_id" : 24835d3e-1fcc-11ed-861d-0242ac120002,
account number : 14654163,
current balance : {
$number decimal : "0"
},
daily interest rate : null,
collateral : [
{
"loan collateral id" : 03501efa-1fcb-11ed-861d-0242ac120002,
"model" : car
},
"related entities" : [
{
"Entity_id" : 8a107a20-1fcb-11ed-861d-0242ac120002,
"shortname" : "name"
"addresses" : [
{
Entity_address_id : ca66ac66-1fcb-11ed-861d-0242ac120002
city : XXX
state : xxx
}
}
]
I am getting total 5 accounts in final payload.someone please help me to write the DataWeave code.

Answer 1

Assuming the intention is to concatenate the accounts from payload1 and payload2, and that payload2 is actually an array, then you can just use the update operator. I'm showing a simplified example, which is what is recommended to do for this kind of questions since most of the payload information is not relevant to the answer.
%dw 2.0
output application/json
var payload2=[
{
"account_id" : "067094ce-1fcc-11ed-861d-0242ac120002",
"account number" : 464634
},
{
"account_id" : "24835d3e-1fcc-11ed-861d-0242ac120002",
"account number" : 14654163
}
]
---
payload[0] update {
case accounts at .accounts -> accounts ++ payload2
}
Input payload:
[
{
"_id" : "7c2a355a-1fca-11ed-861d-0242ac120002",
"accounts" : [
{
"account_id" : "b206ae7e-1fca-11ed-861d-0242ac120002",
"account number" : 123456
},
{
"account_id" : "416535ee-1fcc-11ed-861d-0242ac120002",
"account number" : 594154
},
{
"account_id" : "416535ee-1fcc-11ed-861d-0242ac120002",
"account number" : 258963
}
]
}
]
Output:
{
"_id": "7c2a355a-1fca-11ed-861d-0242ac120002",
"accounts": [
{
"account_id": "b206ae7e-1fca-11ed-861d-0242ac120002",
"account number": 123456
},
{
"account_id": "416535ee-1fcc-11ed-861d-0242ac120002",
"account number": 594154
},
{
"account_id": "416535ee-1fcc-11ed-861d-0242ac120002",
"account number": 258963
},
{
"account_id": "067094ce-1fcc-11ed-861d-0242ac120002",
"account number": 464634
},
{
"account_id": "24835d3e-1fcc-11ed-861d-0242ac120002",
"account number": 14654163
}
]
}