How to search document(s) from a collection based on a Field in Firestore database?

Question

I\'m working on a React Native application and I\'m fetching profiles from a firebase collection. And I want to add a search functionality where when I enter even the first

Answer 1

An approach for full text search recommended by Firebase is to use Algolia https://firebase.google.com/docs/firestore/solutions/search

Using Firestore’s queries with start at and end at with an ordered collection certainly work. If you have a need for full text search within your app elsewhere that requires spelling tolerance etc for example then moving to Algolia is worth considering instead of using compound firestore queries

Answer 2

You should use a combination of orderBy(), startAt() and endAt(), see the documentation here: https://firebase.google.com/docs/firestore/query-data/order-limit-data?authuser=0

 var searchString = 'Sh'   //Example of value
 firebase
      .firestore()
      .collection('yourCollectioName')
      .orderBy('username')
      .startAt(searchString)
      .endAt(searchString + '\uf8ff')
      .get()
  .then(...)

The character \uf8ff used in the query is after most regular characters in Unicode, therefore the query matches all values that start with searchString.