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

As a NoSQL type database, Cloud Firestore doesn't offer any aggregation queries such as grouping, sum, max, etc. You have to perform these operations in your client code. For your case, this means you will have to query for all the documents in the collection, then group them by whatever fields you want. Alternatively, you can maintain a separate collection of pre-grouped documents to satisfy your query. (Duplicating data like this is common in NoSQL type databases.)