Attempting to retrieve a field not acquired by soql will result in the following error

Question

Attempting to retrieve a field not acquired by soql will result in the following error.

SObject row was retrieved via SOQL without querying the requested field: object.field__c

In order to prevent this error from occurring, we know that we need to add fields that we did not get in soql.

Is it possible to write a process to set a null character in a String variable without getting the above error when trying to acquire an unfetched field?

Refer to the following article Check is SObject has certain field

I implemented the following code, but I got an error.

Public static boolean hasSObjectField (String fieldName, SObject so) {
             Return so.getSobjectType().GetDescribe().Fields.getMap().KeySet().Contains (fieldName.toLowerCase ());
}

Answer 1

One workaround would be to use the getPopulatedFieldsAsMap() method. Unfortunately, that makes your API Names case-sensitive.

User u = [SELECT Id FROM User LIMIT 1];
Map<String, Object> data = u.getPopulatedFieldsAsMap();
system.assertEquals(null, data.get('Name'));
system.assertNotEquals(null, data.get('Id'));
system.assertEquals(null, data.get('id'));
system.assertEquals(null, data.get('ID'));