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SFDC_biSFDC_bi 

Event object duplicate trigger

Hello Guys,
 
I am trying to create a trigger to prevent the duplicate meeting request  between the start and end date time.
 
Triggers work when start and end date time matches. However, they do not work between the date time.
 
I would appreciate if someone could review the code and highlight the issue.
  
trigger trg_EventDuplicateBooking on Event (before insert) {
    
    if(trigger.isInsert && trigger.isBefore){
        cls_DuplicateBooking_handler.checkeventduplicaterecord(trigger.new);
    }

}
  
public class cls_DuplicateBooking_handler {
    
    public static void checkeventduplicaterecord(List<Event> evtList){
        try{
            set<string> userSet = new set<string>();
            set<datetime> eventstartdate = new set<datetime>();
            set<datetime> eventenddate = new set<datetime>();
            
            for(Event evt:evtList){
  				userSet.add(evt.OwnerId);
				eventstartdate.add(evt.StartDatetime);
                eventenddate.add(evt.EndDateTime);
            }
            List<Event> eventList = [SELECT OwnerId FROM event WHERE OwnerId IN:userSet AND (StartDatetime <=:eventstartdate AND EndDateTime >=:eventenddate)];
            
            If(eventList.size()>0){
                evtList[0].addError('User already booked');
            }
            
        }
        catch(exception ex){
            throw ex;
        }
    }

}

Thanks
CharuDuttCharuDutt
Hii SFDC
Try Below Code 
public class cls_DuplicateBooking_handler {
    
    public static void checkeventduplicaterecord(List<Event> evtList){
        try{
            set<datetime> eventstartdate = new set<datetime>();
            set<datetime> eventenddate = new set<datetime>();
            for(Event evt:evtList){
				eventstartdate.add(evt.StartDatetime);
                eventenddate.add(evt.EndDateTime);
            }
            List<Event> eventList = [SELECT OwnerId FROM event WHERE StartDatetime IN :eventstartdate AND EndDateTime IN :eventenddate];
            
              for(Event evt:evtList){
              If(eventList.size()>0){ evtList.addError('User already booked'); }
              }  
        }
        catch(exception ex){
            throw ex;
        }
    }

}
Please Mark It As Best Answer If It Helps
Thank You!
SFDC_biSFDC_bi
Hello Charu,

Thanks for your immediate help.

Unfortunately, it won't work as expected. After i amend something on your code, it triggers for the same start and end date time with for the person. But, it won't work between the datetime.

Can you tweak something please 
public class cls_DuplicateBooking_handler {
    
    public static void checkeventduplicaterecord(List<Event> evtList){
        try{
            set<string> userSet = new set<string>();
            set<datetime> eventstartdate = new set<datetime>();
            set<datetime> eventenddate = new set<datetime>();
            for(Event evt:evtList){
                userSet.add(evt.OwnerId);
                eventstartdate.add(evt.StartDatetime);
                eventenddate.add(evt.EndDateTime);
            }
            List<Event> eventList =  [SELECT OwnerId FROM event WHERE OwnerId IN:userSet AND (StartDatetime IN :eventstartdate AND EndDateTime IN :eventenddate)];
            
            for(Event evt:evtList){
                If(eventList.size()>0)
                { 
                    evtList[0].addError('User already booked'); }
            }  
        }
        catch(exception ex){
            throw ex;
        }
    }
    
}