Merging sObjects?

Question

I'm building a UI to help my users merge duplicate custom objects. My understanding is that with API version 29, it's now possible to merge any sObjects, not just Contact, Lead, and Account as before. But when I try to save my code (pseudo-code here)

Service__c keep = getTheOneToKeep();
List<Service__c> others = getTheOnesToLose();
// finally, merge the services
merge keep others;

I get this error:

Compile Error: Specified type SOBJECT:Service__c cannot be merged.

I've checked that the class is being saved with API version 29 in its metadata. What am I missing?

UPDATE: Here's the merge syntax from the documentation linked to above:

merge sObject sObject
merge sObject sObject[]
merge sObject ID
merge sObject ID[]

Answer 1

Merge Any Object is not a delivered Idea on the IdeaExchange, so it seems that what you're looking for doesn't exist yet. Also, there is no "MasterRecordId" field on custom objects, which suggests that merging isn't implemented yet. You will have to go through the painstaking process of manually merging the records through code: query all relationships, reparent the records, then delete the merged record(s). Finally, the documentation doesn't explicitly state that you can merge any object, which should be proof enough that you cannot merge any object (if you could, it would be documented explicitly).