ServiceNow : Copy specific Attachment from one record to another

copy_specific_attachment.js

var CopyAtttachmentUtils = Class.create();
CopyAtttachmentUtils.prototype = {
    initialize: function() {
    },
	copySpecificAttachment : function (donorAttachmentID, recipientTable, recipientID) {
        var grNewAttachment;
        var attDataRecord;
        var newDocRecord;
        var grAttachment = new GlideRecord('sys_attachment');
        if (grAttachment.get(donorAttachmentID)) {
            grNewAttachment = this.copyRecord(grAttachment);
            grNewAttachment.setValue('table_name', recipientTable);
            grNewAttachment.setValue('table_sys_id', recipientID);
            grNewAttachment.update();
            attDataRecord = new GlideRecord('sys_attachment_doc');
            attDataRecord.addQuery('sys_attachment', donorAttachmentID);
            attDataRecord.query();
            while (attDataRecord.next()) {
                newDocRecord = this.copyRecord(attDataRecord);
                newDocRecord.setValue('sys_attachment', grNewAttachment.getValue('sys_id'));
                newDocRecord.update();
            }
        }
    },
    copyRecord: function (record) {
        var i,
            recordElement,
            recordElementName,
            recordTable = record.getTableName(),
            recordFields = record.getFields(),
            grNewRecord = new GlideRecord(recordTable);
        
        grNewRecord.initialize();
        
        for (i = 0; i < recordFields.size(); i++) {
            recordElement = recordFields.get(i);
            if(recordElement.getName() != 'sys_id' && recordElement.getName() != 'number')
            {
                recordElementName = recordElement.getName();
                grNewRecord.setValue(recordElementName, record.getValue(recordElementName));
            }
        }
        
        grNewRecord.insert();
        return grNewRecord;
    },

    type: 'CopyAtttachmentUtils'
};