Re-running Lead Assignment Rules

Question

I'm trying to run lead assignment rules from an invocable method, but it doesn't seem to be actually updating the lead assignment according to the rules (or at all!)

We have a process by which users can create a new lead from a support case, using a quick action (where the use assignment rules checkbox isn't available). When the lead is inserted (and is inserted by a service cloud user), a process builder calls an invocable apex class which looks like this:

public class AssignLeadsUsingAssignmentRules
{
    @InvocableMethod(label='Assign Leads Using Assignment Rules' Description='Run this to re-run assignment rules on any leads needing to be re-checked.')
    public static void AssignLeadsUsingAssignmentRules(List<Id> LeadIds){
        system.debug('In InvocableMethod - sending to future method');
        leadAssignFuture(leadIds);

   }

    @future
    public static void leadAssignFuture(List<Id> LeadIds){

        system.debug('in future method - lead ids: ' + leadIds);

        database.DMLOptions dmo = new Database.DMLOptions();
        dmo.assignmentRuleHeader.assignmentRuleId= '01Q0O0000003R7Q';
        //dmo.assignmentRuleHeader.useDefaultRule = true;

        list<Lead> leadList = new list<lead>{};
        for(lead l : [select id from lead where lead.id in :LeadIds]){
            l.setOptions(dmo);
            leadList.add(new Lead(id = l.id));

        }
        system.debug('DMO: ' + dmo);

        database.update(leadList);
   }
}

As you can see, I have:

a) put the "meat" of the code in a future method to ensure that it doesn't hit order of execution issues (is this the right thing to do?)

b) tried using both the default lead assignment rule and explicitly naming one, but neither option works. I'm not seeing any errors in my debug logs, and the 'DMO' debug call above returns this:

DMO: DMLOptions:[AllowFieldTruncation=null, AssignmentRuleHeader=AssignmentRuleHeader:[AssignmentRuleId=01Q0O0000003R7Q, UseDefaultRule=null], DuplicateRuleHeader=DuplicateRuleHeader:[AllowSave=null, RunAsCurrentUser=null], EmailHeader=EmailHeader:[TriggerAutoResponseEmail=null, TriggerOtherEmail=null, TriggerUserEmail=null], LocaleOptions=null, LocalizeErrors=null, OptAllOrNone=null]

After this runs, the owner of the lead is still just the individual who triggered the process, not the queue as it should be in the assignment rule.

I'm not quite sure what else I can try - any suggestions?

Answer 1

With thanks to gNerb and sfdcfox, here's the altered code to fix the issue:

public class AssignLeadsUsingAssignmentRules{

    @InvocableMethod(label='Assign Leads Using Assignment Rules' Description='Run this to re-run assignment rules on any leads needing to be re-checked.')

       public static void AssignLeadsUsingAssignmentRules(List<Id> LeadIds){
       system.debug('In InvocableMethod - sending to future method');
       leadAssignFuture(leadIds);

    }

    @future
       public static void leadAssignFuture(List<Id> LeadIds){

       system.debug('in future method - lead ids: ' + leadIds);

       database.DMLOptions dmo = new Database.DMLOptions();
       dmo.assignmentRuleHeader.useDefaultRule = true;

       list<Lead> leadList = [select id from lead where lead.id in :LeadIds];
       system.debug('DMO: ' + dmo);

       database.update(leadList, dmo);
   }

}