Firestore Group by field

Question

Below is my firestore collection structure

My vue method to get data

fetchResults(){
  db.collection(\'data\').onSnapshot((querySnapShot)=>{
         


        

Answer 1

Instead of calculating the data with an aggregate query, the data should be saved in the document itself using client side logic to update the aggregate data each time the document is changed or use cloud functions.

See this post from Google blog.

https://firebase.google.com/docs/firestore/solutions/aggregation