How to create a json message from 2 different json message using Dataweave

Question

I want to create a json message from 2 different Json message. Both input messages are coming from flow variables. How can it be done using Dataweave.

Message 1:

    [

     {
         "userId": 11,
         "name": "ABC",
         "age": 30
     },

     {
         "userId": 44,
         "name": "XYZ",
         "age": 30
     }

     ]

Message 2:

 [

 {
     "userId": 11,
     "Address": "BLR"
 },
 {
     "userId": 44,
     "Address": "CCU"
 }

 ]

Expected output:

[

 {
     "userId": 11,
     "name": "ABC",
     "Address": "BLR"
 },
 {
     "userId": 44,
     "name": "XYZ",
     "Address": "CCU"
 }

 ]

Thank You in advance, Nitesh

Answer 1

Refer this article. Seems the perfect solution for your usecase.

Answer 2

You can use lookup instead of filter as using filter is performance overhead. Try this

%dw 1.0
%output application/json
 %var adressLookup = {(  flowVars.data map  {
    ($.userId ++ "") : $
 })}
 ---
payload map {
    userId : $.userId,
    name : $.name,
    Address : adressLookup[$.userId ++ ""].Address
}

where payload is message1 and flowVars.data is message2

PS : I have used $.userId ++ "" as key in string format for hashmap, some how numeric key isn't work with weave hashmap.

also refer Merge two json payload with dataweave

Hope this helps.