What is the reason for Cloud Firestore's realtime database fetching all items?

Currently, I am developing a project with vuejs and I am facing an issue where I need to fetch only the last created item from Firestore's realtime database. However, when I execute the following code snippet, it retrieves all items from the database instead.

getRealtime() {
        db.collection("items").onSnapshot(doc => {
          doc.docChanges().forEach(function(change) {
            if (change.type === "added") {
                console.log(change.doc.data());
            }
        });

        })
      }

Answer №1

Your current code successfully retrieves all the documents in the "items" collection. It's important to note that there is no default ordering for these documents. If your goal is to only retrieve the newest document, you will need to include a timestamp field in each document and query based on that field. Don't forget to use the limit() function to specify that you only want the newest 1 document.

Check out these resources for more information:

  • How to do a firestore query in chronological order on creation
  • Sort X most recent Firestore documents Ascending by timestamp, and add in real time

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