Bad state: field does not exist within the documentsnapshotplatform

When you receive the error message “bad state: field does not exist within the DocumentSnapshotPlatform”, it means that you are trying to access a field that does not exist in the document you are retrieving from Firestore.

Example:

Let’s say you have a collection called “users” in Firestore and each document in that collection represents a user. Each user document has fields like “name”, “email”, and “age”. Now, if you try to access a field called “address” which doesn’t exist in any of the user documents, you will get the “bad state: field does not exist within the DocumentSnapshotPlatform” error.

Solution:

To avoid this error, you need to make sure that the field you are accessing is present in the document. You can check if a field exists in the document before accessing it using the `contains` method on the `data` property of the `DocumentSnapshot`.

        DocumentSnapshot snapshot; // Assume you have a DocumentSnapshot object
        
        if (snapshot.data().containsKey('address')) {
            // Field exists, access it here
            var address = snapshot.data()['address'];
            // do something with the address
        } else {
            // Field doesn't exist, handle it accordingly
            // Maybe show an error message to the user
        }
    

In the above example, we are first checking if the field “address” exists in the document using the `containsKey` method. If it exists, we can access it using the `data` method and the name of the field like `snapshot.data()[‘address’]`. If it doesn’t exist, we can handle it accordingly, such as displaying an error message or showing a default value.