Clone files one from one case to another

Question

I want to copy files (not attachment sObject) from old case to the new one as feeditem. What sObjects should I copy?

Answer 1

Why clone files and increase file Storage when you can link same file to multiple cases.

The junction Object from Case and File is called as ContentDocumentLink.

So what we can do is create another link of that file for new case.

public static void cloneFilesFromOldCaseToNew(String oldCaseId ,String newCaseId ){
    List<ContentDocumentLink> toBeClonedContentDocumentLinks = [SELECT ContentDocumentId,Id,IsDeleted,LinkedEntityId,ShareType,SystemModstamp,Visibility FROM ContentDocumentLink where LinkedEntityId=:oldCaseId];
    for(ContentDocumentLink cdl : toBeClonedContentDocumentLinks){
        cdl.Id=null;
        cdl.LinkedEntityId = newCaseId;
    }

    insert toBeClonedContentDocumentLinks;
}

Src: https://developer.salesforce.com/docs/atlas.en-us.api.meta/api/sforce_api_objects_contentdocumentlink.htm