CODEWITHSUNDEEP
javascriptfirebasegoogle-cloud-firestore
Filip Simin
Filip Simin

Reputation: 578

Check if document field has value firebase

I'm trying to check if certain field in a collection has a value.

I have a collection of users and that collection has a documents by their uid than that document has a field bio.

I want to check if that field is empty or not.

This is where i'm at at the moment...

  const docRef = db.collection('users').doc(auth.user.uid).get()
  docRef.then((querySnapshot) => {
    if(querySnapshot.docs[0].data() != ''){
      //there is value in field
    }
  })

Upvotes: 0

Views: 186

Answers (1)

Renaud Tarnec
Renaud Tarnec

Reputation: 83068

By doing db.collection('users').doc(auth.user.uid).get() you define a Promise that resolves with a DocumentSnapshot (and not a QuerySnapshot). A DocumentSnapshot does not have any docs property.

So you need to do as follows:

const docRef = db.collection('users').doc(auth.user.uid).get();
docRef.then((docSnapshot) => {
    if (docSnapshot.exists) {
        if (docSnapshot.data().bio === '') {
           // Bio is empty
        }
    } else {
        // docSnapshot.data() will be undefined in this case
        console.log("No such document!");
    }
}).catch((error) => {
    console.log("Error getting document:", error);
});

Note that from a naming convention perspective, it would make more sense to write:

const docRef = db.collection('users').doc(auth.user.uid); // This is a DocumentReference
docRef.get().then((doc) => {...});

Upvotes: 1

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