I use firebase firestore db. This project have two main collection "securecollection" and "publiccollection". The securecollection is where all important data is stored and only accessible to authenticated users. But in order for some information to be visible to guest users, I am copying them into the publiccollection. Then, I want to save the id of this newly created public document in the secure document.

When I write a variable db.collection('securecollection').doc(secureDocid).update({ inside the query sentence, I get this error:

Uncaught (in promise) TypeError: o.indexOf is not a function

If I write the id as text db.collection('securecollection').doc('7llDqIWlmE5VM69Zzle2').update({, the code works.

Here is my code:

function toggleOlustur(secureDocid) {
  const db = firebase.firestore();
  db.collection("securecollection").get()
    .then(querySnapshot => {
      querySnapshot.forEach(doc => {
        if (doc.id == secureDocid) {
          db.collection("publiccollection").add({
              oad: doc.data().oad,
              osad: doc.data().osad,
              opuan: doc.data().opuan,
              odtarih: doc.data().odtarih,
              odurum: "1",
            })
            .then((docRef) => {
              db.collection('securecollection').doc(secureDocid).update({
                preference: docRef.id
              })
            });
        }
      });
    });
}