how to set custom object with document id to a collection in firestore in flutter?

Question

I defined a dart class A with some string variables and a list of objects of another class B. I don't find any method function in cloud_firestore module to set this custom object of class A, as a document to the collection, even though custom objects are supported in Firestore. Do I need to convert all the members(strings, lists etc) of class A to JSON format or any other solution available?

Answer 1

In the event that it's inconvenient to create another collection of the related custom class, the only alternative is to build the related class instances yourself.

import Player from // player module

class GameState {
  constructor(data) {
    this.players = data.players.map(p => new Player(p))
    // ...
  }

  // flatten GameState into a generic JS map
  // build one of these on Player also
  asFBData() {
    const playerFBData = this.players.map(p => p.asFBData())
    return { playerFBData, ...other_game_state_here }
  }
}

const gameStateConverter = {
  toFirestore: gameState => gameState.asFBData(),
  fromFirestore: (snapshot, options) => new GameState(snapshot.data(options))
}