从获取的文档中获取文档引用 (Firestore)

Question

(Firebase Version 9)

I'm trying to get document references from the fetched documents of the collection "products" with 2 sets of code below but both return "undefined" .

Get single document:

const docsSnap = await getDoc(
  doc(db, "products/WuAC97j0avTAFNs1kvdf"),
);

console.log(docsSnap.data().ref); // undefined

Get multiple documents:

const docsSnap = await getDocs(
  collection(db, "products"),
);

console.log(docsSnap.docs[0].data().ref); // undefined

Are there any ways to get document references from the fetched documents?

Answer 1

Remove ".data()" before ".ref" from both of the code to get document references .

Get single document:

const docsSnap = await getDoc(
  doc(db, "products/WuAC97j0avTAFNs1kvdf"),
);
                    // Here
console.log(docsSnap.ref); // Tc

Get multiple documents:

const docsSnap = await getDocs(
  collection(db, "products"),
);
                            // Here
console.log(docsSnap.docs[0].ref); // Tc

In addition, you can also get document IDs by replacing ".ref" with ".id" :

Get single document:

const docsSnap = await getDoc(
  doc(db, "products/WuAC97j0avTAFNs1kvdf"),
);
                    // Here
console.log(docsSnap.id); // WuAC97j0avTAFNs1kvdf

Get multiple documents:

const docsSnap = await getDocs(
  collection(db, "products"),
);
                            // Here
console.log(docsSnap.docs[0].id); // WuAC97j0avTAFNs1kvdf