Unable to get Salesforce Apex map to list

Question

I am loosing the values on record whenever I am trying to pass the map value to the list, and also it is not been updated it. Herewith I have attached the debug code:

USER_DEBUG|[403]|DEBUG|posUpdate record -->Position__c:{Affiliation_Final__c=a03N0000000mQEKIA2, Position_Type__c=Warden, Id=a07N0000000iA6lIAE}

11:21:17.825 (825365000)|SYSTEM_METHOD_EXIT|[403]|System.debug(ANY)

11:21:17.825 (825386000)|SYSTEM_METHOD_ENTRY|[404]|String.valueOf(Object)

11:21:17.825 (825402000)|SYSTEM_METHOD_EXIT|[404]|String.valueOf(Object)

11:21:17.825 (825413000)|SYSTEM_METHOD_ENTRY|[404]|System.debug(ANY)

11:21:17.825 (825418000)|USER_DEBUG|[404]|DEBUG|id ->null

11:21:17.825 (825422000)|SYSTEM_METHOD_EXIT|[404]|System.debug(ANY)

11:21:17.825 (825439000)|SYSTEM_METHOD_ENTRY|[405]|String.valueOf(Object)

11:21:17.825 (825453000)|SYSTEM_METHOD_EXIT|[405]|String.valueOf(Object)

11:21:17.825 (825464000)|SYSTEM_METHOD_ENTRY|[405]|System.debug(ANY)

11:21:17.825 (825468000)|USER_DEBUG|[405]|DEBUG|Affiliation_Final__c ->null

11:21:17.825 (825472000)|SYSTEM_METHOD_EXIT|[405]|System.debug(ANY)

11:21:17.825 (825516000)|DML_BEGIN|[406]|Op:Update|Type:Position__c|Rows:2

11:21:17.826 (826821000)|DML_END|[406]

11:21:17.826 (826971000)|EXCEPTION_THROWN|[406]|System.DmlException: Update failed. First exception on row 0; first error: MISSING_ARGUMENT, Id not specified

Can anyone help me with this error?

Answer 1

As per the error it seems that you have a posMap where the records are not be inserted or retrieved from the database. So, to do that you can try using upsert operation, which will insert those. You can try like this:

upsert posMap.values();

I hope this will help. 

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