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I have an Apex class which has a method having an Object type parameter

public with sharing class DmlOnSObjectRecords {
@AuraEnabled(cacheable=false)
public static void dmlOperationOnSObjectRecords(Object data) {
    List<SObject> recordsForUpdate = (List<SObject>) JSON.deserialize(
        JSON.serialize(data),
        List<SObject>.class         
    );
    try {
        upsert recordsForUpdate;
    }
    catch (Exception e) {
    }
   }
 }

The parameter given is a JSON in the following format

 {"Id":"0036F00003gZDJQQA4","FirstName":"Madhurima"}

My problem here is that, the deserialization is throwing me an error

 Nested object for polymorphic foreign key must have an attributes field before any other fields.

I also tried deserializing in the following format

 Map <String, Object> result = (Map <String, Object>) JSON.deserializeUntyped(dataString);

But this also throws an error

 Invalid conversion from runtime type List<ANY> to Map<String,ANY>

I don't want to hard code the type during deserialization because, I want to keep it as a dynamic component.

Also I don't want to use a wrapper class because, then I will have to hard code the paramter fields.

2

You can pass the type also as a parameter and then deserialize it based on that.

Also pass a string using JSON.stringify in the strJSONdata from UI.

Something like this:

@AuraEnabled
public static void dmlOperationOnSObjectRecords(String strJSONData, String strType, Boolean boolIsList) {
    List<SObject> lstObjects = new List<SObject>();
    if (boolIsList) {
        lstObjects = (List<SObject>) JSON.deserialize(strJSONData, Type.forName(strType));
    } else {
        SObject obj = (SObject) JSON.deserialize(strJSONData, Type.forName(strType));
        lstObjects.add(obj);
    }
    System.debug(lstObjects.size());
    System.debug(lstObjects);
}

Anonymous apex:

YourClassName.dmlOperationOnSObjectRecords('{"Id":"0036F00003gZDJQQA4","FirstName":"Madhurima"}', 'Contact', false);

YourClassName.dmlOperationOnSObjectRecords('[{"Id":"0036F00003gZDJQQA4","FirstName":"Madhurima"}]', 'List<Contact>', true);
4
  • This works, though I would have preferred fetching the Object Type from the record Ids themselves instead of passing the Object type from the js file. Is there absolutely no way to achieve that? @NagendraSingh
    – Madhurima
    Jan 5 at 4:25
  • 1
    Yes there is, but in that case, you need to pass the ID separately instead of the Object Type. Id.valueOf('YOUR_RECORD_ID').getSobjectType().getDescribe().getName() Jan 5 at 4:55
  • hmm, I am actually passing it from a lwc datable, so the only thing I can pass is an Object. No way to separate the editable Ids.
    – Madhurima
    Jan 5 at 9:37
  • I dont think you, you still can, you can just do JSON.stringyfy / JSON.parse and do .Id, that should given you the Id from the row. Jan 5 at 10:34

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