ppc_amnet/amnet-native/models/RealmContext.ts

import {Realm} from "realm";
import {createRealmContext} from "@realm/react";

import {AMCard} from "./AMCard";
import {AMServer} from "./AMServer";
import {AMCardRecentUse} from "./AMCardRecentUse";
import {AMPhysicalCardData} from "./AMPhysicalCardData";

const migrationFunction = (oldRealm: Realm, newRealm: Realm) => {
    if (oldRealm.schemaVersion < 5) {
        const oldCards = oldRealm.objects("card");
        const gameIdMap: Map<string, { card: any, lastUsed: Date }> = new Map();

        // get last used card for each game
        oldCards.forEach((card: any) => {
            if (card.lastUsedGameId && card.lastUsed) {
                const existing = gameIdMap.get(card.lastUsedGameId);
                if (!existing || card.lastUsed > existing.lastUsed) {
                    gameIdMap.set(card.lastUsedGameId, {card, lastUsed: card.lastUsed});
                }
            }
        });

        // write new history records
        const newCards = newRealm.objects("card");
        gameIdMap.forEach((value, gameId) => {
            const newCard = newCards.filtered(`_id == $0`, value.card._id)[0];
            newRealm.create("cardUsageHistory", {
                gameId: gameId,
                card: newCard
            });
        });
    }
};

// @ts-ignore
export default createRealmContext({
    schemaVersion: 5,
    schema: [AMPhysicalCardData, AMCardRecentUse, AMCard, AMServer],
    onMigration: migrationFunction,
    deleteRealmIfMigrationNeeded: false,
});