Firebase seems to attempt to begin listening for snapshot updates before authentication sequence is run. any way to fix this?

Question

It seems that before firebase is able to get the current user authentication data such as the email used for login, it attempts to call

   firestore.collection("users").doc(firebase.auth().currentUser.email).onSnapshot(function(doc) {
      console.log("check")
   });

the thing is, it requires the current user's email to access the correct document in the collection from within the database.

is there any way to circumvent this and to wait until currentUser defined?

Answer 1

If your code depends on having an authenticated user, you should run it in an onAuthStateChanged callback. For example:

firebase.auth().onAuthStateChanged(function(user) {
  if (user) {
   firestore.collection("users").doc(firebase.auth().currentUser.email).onSnapshot(function(doc) {
      console.log("check")
   });
  }
});

Also see the Firebase documentation on getting the authenticated user .