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How do you prevent trigger recursion properly using a Set<Id> of processed record IDs?

DevelopmentMediumSalesforceDeloittePersistent

Keep a static Set<Id> in the handler. Each time the trigger runs, filter Trigger.new to records whose Id is not yet in the set, process only those, and add them to the set.

apex
public class AccountHandler {
    private static Set<Id> processedIds = new Set<Id>();
    public void afterUpdate(List<Account> news) {
        List<Account> toProcess = new List<Account>();
        for (Account a : news) {
            if (!processedIds.contains(a.Id)) {
                processedIds.add(a.Id);
                toProcess.add(a);
            }
        }
        // process toProcess
    }
}

This works across 200-record chunks. If a record legitimately must be reprocessed after another change, compare field values instead.

apex-triggertriggerrecursion

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