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Write a trigger on ContentDocumentLink (File upload) to check if a file is uploaded to a Case and update Has_Attachment__c = true on the Case.

DevelopmentMediumDeloitteCognizantCapgemini

Files are linked to records through ContentDocumentLink (the LinkedEntityId is the Case Id). Use after insert and check the Case key prefix (500).

apex
trigger CDLTrigger on ContentDocumentLink (after insert) {
    Set<Id> caseIds = new Set<Id>();
    for (ContentDocumentLink l : Trigger.new) {
        if (l.LinkedEntityId != null && l.LinkedEntityId.getSObjectType() == Case.SObjectType) caseIds.add(l.LinkedEntityId);
    }
    if (caseIds.isEmpty()) return;
    List<Case> cases = new List<Case>();
    for (Id id : caseIds) cases.add(new Case(Id = id, Has_Attachment__c = true));
    update cases;
}

You can't write a trigger directly on ContentDocument for the upload link itself, since the link is created by ContentDocumentLink.

apex-triggertriggercodingscenariofiles

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