Removing duplicates from a List containing wrapper Objects

Question

I am trying to remove duplicates from a List of Custom Objects.

This is what I am doing:

Set<CustomObject> mySet = new Set<CustomObject>();
mySet.addAll(originalList); //OriginalList contains duplicate Custom Objects.
System.debug(mySet.size()); //This always prints the same size of the original list

I don't know what is wrong happening here, When I see the list of items using debug there are clearly two Objects with same details.

Anything am I missing??

Answer 1

The Ids of records of that CustomObject are different. So the values in the set are different(each record is unique) and that's why they are not de-duplicated. If you want to use the Set based approach, clone each record and add it to the Set.

Set mySet = new Set();

for(CustomObject co : originalList) { mySet.add(co.clone()); }

//Check the size