How do I write a compound query in firebase?

Question

I have the following typescript for looking up a city based on its population...

import { getFirebase } from "react-redux-firebase";

...

  get fb() {
    return getFirebase();
  }
  get fs() {
    return this.fb.firestore();
  }

  getCollection(collectionName: string) {
    return this.fs.collection(collectionName);
  }
...
firestore.collection("cities").where("population", "<", 100000)

What if I wanted to add a clause to look up a city by its population AND restrict the state to California? (My state column is called "CA")?

Answer 1

If you're working with the data as shown in the documentation on compound queries , then just add another where clause, which creates a logical AND condition:

firestore
    .collection("cities")
    .where("population", "<", 100000)
    .where("state", "==", "CA")