If i have a query like:

SELECT id, (SELECT id FROM Detail_Object__r) 
FROM Master_Object__c 
WHERE id IN: trigger.newmap.keyset()

Is it possible to assign the results to a list of type Detail_Object__c directly?

Attribution to: Phil B

Possible Suggestion/Solution #1

List<Detail_Object__c> details = [SELECT Id, Name
FROM Detail_Object__c
WHERE Lookup_to_Master__c IN :trigger.new];

No need to even extract the Ids into Set with trigger.newMap.keyset(); bind variable should work with collection of sObjects.

Attribution to: eyescream

Possible Suggestion/Solution #2

You could also iterate over them, after you did your query, this way you will have all the results, regardless of how many master objects.

like so:

List<Detail_Object__c> detailObjectList = new List<Detail_Object__c>();
for(Master_Object__c m : masterObjectList)
{
     detailObjectList.addAll(m.Detail_Object__r);
}

Attribution to: pjcarly
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