Get _id of inserted row and store in session

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Got it, thanks - am I saving correctly to session in the following?:

let toInsert = {
  postcode : $w("#pcinput").value
};
    wixData.insert("mydataset",  toInsert)
  .then( (results) => {
      console.log(results._id);
    session.setItem("sessionid", results._id);
    } )
    .catch( (err) => {
 let errorMsg = err;
    } );