Retrieve parent values from getPopulatedFieldsAsMap?

Question

This question is related to help I received on a separate question: Get fieldnames from List.

I have since implemented this code:

for (DopplerListSubscriber__c susc : sobjList) {
    Map<String,Object> fieldsPopulated = susc.getPopulatedFieldsAsMap();
    System.debug(fieldsPopulated);
}

I'm getting the following debug log:

15:59:58:141 USER_DEBUG [35]|DEBUG|{Contact__c=00346000002O4YlAAK, Contact__r=Contact:{Id=00346000002O4YlAAK, Name=Jack Rogers, [email protected]}, DopplerList__c=a0046000001OvCGAA0, Id=a0246000001nTMdAAM}

The problem is, how do I access to Name and Email fields from the Contact__r key? That is:

Contact__r=Contact:{Id=00346000002O4YlAAK, Name=Jack Rogers, [email protected]}

Answer 1

Contact__r looks like it's an object. You can get the object by doing this:

Contact cnt = (Contact)fieldsPopulated.get('Contact__r');
system.debug('Email: ' + cnt.Email);
system.debug('Name : ' + cnt.Name);

==UPDATE (Per Comments)==

If you don't know the type of object that will be returned you can do this

Object obj = fieldsPopulated.get('Contact__r');
system.debug('Email: ' + obj.get('Email'));
system.debug('Name : ' + obj.get('Name'));

Answer 2

I will prefer to write this logic to find out the field types.

getFieldType() method will take parameters like SObject and fieldName and will return the field type.

for (DopplerListSubscriber__c susc : sobjList) {
    Map<String,Object> fieldsPopulated = susc.getPopulatedFieldsAsMap();

    //since fieldsPopulated is returning
    /*
    {Contact__c=00346000002O4YlAAK, Contact__r=Contact:{Id=00346000002O4YlAAK, 
    Name=Jack Rogers, [email protected]}, 
    DopplerList__c=a0046000001OvCGAA0, Id=a0246000001nTMdAAM}
    */

    Set<String> fields = fieldsPopulated.keySet();
    for(String str:fields)
    {
        Schema.DisplayType dt = getFieldType(Contact, str);

        if(fd.getType() == Schema.DisplayType.String)
        {                       
            //handle String type and retrieve values from API Name
            System.debug((String) fieldsPopulated.get(str));
        }
    }
}

public Schema.DisplayType getFieldType(SObject obj, fieldName)
{
    Map<string, schema.sobjectfield> fieldMap = obj.getDescribe().fields.getMap();
    if (fieldMap != null)
    {
        // Loop through all fields.
        for (Schema.SObjectField f : fieldMap.values())
        {
            // Describe each field.
            Schema.DescribeFieldResult fd = f.getDescribe();
            if(fd.getName().equals(fieldName)
            {
                return fd.getType();
            }                           
        }
    }
}