Why is my dataweave map code not working?

Question

I'm trying to convert some code from mule 3 to mule 4 so I'm using dataweave 2. I keep getting errors from this code

keySets: if(payload.autoQuote !=null) payload.autoQuote map (autoQuote) -> {
    (if(payload.autoQuote.personalAuto.vehicles != null) autoQuote.personalAuto.vehicles map ((vehicles,indexOfvehicle) ->{
        keySet: {
            key: if(vehicles.usage != null) vehicles.usage else 'DNF' ,
            keySequence: "TAUTO_USE_TYPE" ++ '_' ++ indexOfvehicle
    }
    } else {}))
} else {}

On the first line I'm getting mismatched input '->' expecting 'else'

on the second line I'm getting - missing EOF at 'payload'

and - no viable alternative at input '(' on the first two '('

score 0 · Answer 1 · answered Jul 25 '19 at 00:25

I believe keySets is a list and not a object, you should be using [] and not {} in your else statements. I edited some of the braces, and it is compiling fine for me, though not sure if it will work as expected for you.

keySets: if(payload.autoQuote !=null) (payload.autoQuote map (autoQuote) -> {
    (if(payload.autoQuote.personalAuto.vehicles != null) 
        autoQuote.personalAuto.vehicles map ((vehicles,indexOfvehicle) -> {
            keySet: {
                key: if(vehicles.usage != null) vehicles.usage else 'DNF',
                keySequence: "TAUTO_USE_TYPE" ++ '_' ++ indexOfvehicle
        }
    }) else [])
}) else []

Give it a try and let me know if it worked.

score 0 · Answer 2 · answered Jul 25 '19 at 01:11

This doesn't give me errors, though I'm not sure if it makes sense:

%dw 2.0
output application/json
---
{
    keySets: if(payload.autoQuote !=null) (payload.autoQuote) map(autoQuote, i)  -> {
        ( if(payload.autoQuote.personalAuto.vehicles != null) (autoQuote.personalAuto.vehicles) map (vehicles,indexOfvehicle) ->{
            keySet: {
                key: if(vehicles.usage != null) vehicles.usage else 'DNF' ,
                keySequence: "TAUTO_USE_TYPE" ++ '_' ++ indexOfvehicle
            }
        } else {})
    } else {}
}

You should give an example of the input and the expected output.

Also I'm not sure why you don't use the autoQuoteparameter of the map inside of the map instead of payload.autoQuote...

score 0 · Answer 3 · answered Jul 26 '19 at 18:05

Turns out I had the parentheses wrong. The first else was in the parentheeses after the map. It should look like this. Don't know if it works but it at least compiles.

keySets: if(payload.autoQuote !=null) payload.autoQuote map (autoQuote) -> {
    (if(payload.autoQuote.personalAuto.vehicles != null) autoQuote.personalAuto.vehicles map ((vehicles,indexOfvehicle) ->{
    keySet: {
        key: if(vehicles.usage != null) vehicles.usage else 'DNF' ,
        keySequence: "TAUTO_USE_TYPE" ++ '_' ++ indexOfvehicle
}
}) else {})
} else {}

Why is my dataweave map code not working?

3 Answers3