I think it's done?

src/ObjectCollections/SavedGameCollection.ts

@@ -0,0 +1,54 @@
+import MongoStoredObjectCollection from "./MongoStoredObjectCollection";
+import mongo from "mongodb";
+import {ActiveRecordId} from "../Objects/ActiveRecord";
+import PlayerCollection from "./PlayerCollection";
+import SavedGame from "../Objects/SavedGame";
+import {getMongoObjectCollection} from "../database";
+import {PlayerGameResults} from "../Objects/DefaultStatsMongoData";
+import RulesetCollection from "./RulesetCollection";
+import {GameSubmission} from "../controllers/statsController";
+
+export interface SavedGameMongoData {
+    id: string;
+    rulesetUsed: ActiveRecordId;
+    players: ActiveRecordId[];
+    results: PlayerGameResults[];
+}
+
+class SavedGameCollection extends MongoStoredObjectCollection<SavedGameMongoData> {
+    constructor(collectionClient: mongo.Collection) {
+        super(collectionClient);
+    }
+
+    private async savedGameFrom(data: SavedGameMongoData): Promise<SavedGame> {
+        const playerList: {name: string, id: ActiveRecordId}[] = [];
+        for (const playerId of data.players) {
+            const player = await PlayerCollection.read(playerId);
+            playerList.push({name: player.getNick(), id: playerId})
+        }
+        const rulesetUsed = await RulesetCollection.read(data.rulesetUsed);
+        return new SavedGame(
+            data.id,
+            {name: rulesetUsed.getName(), id: data.rulesetUsed},
+            playerList,
+            data.results);
+    }
+
+    async read(id: string): Promise<SavedGame> {
+        const foundGame = await this.mongoRead(id);
+        return this.savedGameFrom(foundGame);
+    }
+
+    async create(gameSubmission: GameSubmission): Promise<SavedGame> {
+        const pids = gameSubmission.players.map(playerIdAndNick => playerIdAndNick.id);
+        return this.savedGameFrom(
+            await this.mongoCreate({
+                rulesetUsed: gameSubmission.rulesetId,
+                players: pids,
+                results: gameSubmission.results})
+        );
+    }
+}
+
+const SavedGameCollectionSingleton = new SavedGameCollection(getMongoObjectCollection("users"));
+export default SavedGameCollectionSingleton;