javascript - How to reduce document reads for Firestore - Stack Overflow

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I am using Firestore (I am new to this) for small web application. Currently, each time when I refresh or go to another page, the function retrieves all the documents in the Firestore. But the data that it retrieves does not change often,

Is there a way for me to retrieve all the data that will cost me little to no document reads?

I am currently using these function to retrieve the data

firebase
.firestore()
.collection("products")
.then((snapshot) => {
       snapshot.forEach((docs) => {
       });
});



firebase
.firestore()
.collection("products")
.where("prodID", "==", prodID)
.then((snapshot) => {
       snapshot.forEach((docs) => {
       });
});

I am using Firestore (I am new to this) for small web application. Currently, each time when I refresh or go to another page, the function retrieves all the documents in the Firestore. But the data that it retrieves does not change often,

Is there a way for me to retrieve all the data that will cost me little to no document reads?

I am currently using these function to retrieve the data

firebase
.firestore()
.collection("products")
.then((snapshot) => {
       snapshot.forEach((docs) => {
       });
});



firebase
.firestore()
.collection("products")
.where("prodID", "==", prodID)
.then((snapshot) => {
       snapshot.forEach((docs) => {
       });
});

• javascript
• firebase
• google-cloud-firestore
• google-cloud-functions
• nosql

Share Improve this question Follow edited Oct 19, 2021 at 17:17 Dharmaraj 51.1k88 gold badges6767 silver badges9898 bronze badges asked Oct 19, 2021 at 16:06 Chan Wei JieChan Wei Jie 8311 silver badge66 bronze badges 0

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1 Answer 1

Sorted by: Reset to default 5

It depends on your app.
But a way to reduce it would be to retrieve them from the cache.
According to the docs (https://firebase.google./docs/reference/android//google/firebase/firestore/Source) you can do something like

function getData() {
   firebase
   .firestore()
   .collection("products")
   .get({source: "cache"})
   .then((snapshot) => {
         if (!snapshot.exist) return getServerData()
         snapshot.forEach((docs) => {
       });
  });
}

function getServerData() {
   firebase
   .firestore()
   .collection("products")
   .get()
   .then((snapshot) => {
         snapshot.forEach((docs) => {
       });
  });
}   

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