Unable to use my wrapper class in Lightning component API version 42

Question

Below Code:

public class parentclass{

    public class Model{
        @AuraEnabled public String year {get;set;}
        @AuraEnabled public Map<Integer, Decimal> dataMap {get;set;}
    }
}

Component Code:

<aura:component controller="parentclass" implements="flexipage:availableForAllPageTypes,force:hasRecordId" access="global">
    <aura:attribute name="listVehicles" type="parentclass.Model[]" />

** Erorr while saving the component:

Failed to save undefined: Invalid type: Model[]`**

This is speacially on the API 42 version, I have old component which is on 40 API version works absolutely fine. Is this is a bug or not the right way to use wrapper any more in lightning ?

Any ideas appreciated !

Thanks

Answer 1

We are not supposed to use it as per this link from salesforce. This was never intended to work in the first place. This was enforced from Api version 42.

Use a separate outer class for the inner wrapper class.