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ViewsFirestore Query Raises Exception if Including orderBy
I have the following function:
async function loadGalleryImages2() { // load images for gallery
const collectionRef = db.collection('projects').doc(project.id).collection('images')
const docQuery = query(collectionRef, orderBy('displayOrder'))
}
where the declaration of docQuery causes the following error to appear in console:
Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'startAt')
If I remove the orderBy parameter as shown below, I do not get any error.
async function loadGalleryImages2() { // load images for gallery
const collectionRef = db.collection('projects').doc(project.id).collection('images')
const docQuery = query(collectionRef)
}
The firebase docs show similar examples so I'm not sure why this is causing errors.
1 answers
Answer question0
Upon checking your code, you've used both the web version 9 (modular) and web version 8 (namespaced). I replicated your code and was able to get the same error:
Moving forward, you must only choose one version between the two. Also, check this guide for more information in upgrading from version 8 to modular (version 9) Web SDK.
I've tried your code for both modular and namespaced using the code below:
For namespaced (web version 8):
async function loadGalleryImages2() { // load images for gallery
const collectionRef = db.collection("projects").doc(project.id).collection("images").orderBy("displayOrder");
collectionRef.get()
.then((querySnapshot) => {
querySnapshot.forEach((doc) => {
// doc.data() is never undefined for query doc snapshots
console.log(doc.id, " => ", doc.data());
});
})
.catch((error) => {
console.log("Error getting documents: ", error);
});
}
And for modular (web version 9):
// Add this in your import statement if you choose to use modular version
import { getFirestore, collection, query, getDocs, onSnapshot } from "firebase/firestore";
async function loadGalleryImages2() { // load images for gallery
const querySnapshot = await getDocs(collection(db, "projects", project.id, "images"), orderBy("displayOrder"));
querySnapshot.forEach((doc) => {
// doc.data() is never undefined for query doc snapshots
console.log(doc.id, " => ", doc.data());
});
}