- let objectStore = db.createObjectStore("games", { keyPath: "id" });
- // To sarch games by score (useful for running games)
- objectStore.createIndex("score", "score", { unique: false });
- // To search by date intervals. Two games cannot start at the same time
- objectStore.createIndex("created", "created", { unique: true });
+ let upgradeTransaction = event.target.transaction;
+ let objectStore = undefined;
+ if (!db.objectStoreNames.contains("games"))
+ objectStore = db.createObjectStore("games", { keyPath: "id" });
+ else
+ objectStore = upgradeTransaction.objectStore("games");
+ if (!objectStore.indexNames.contains("score"))
+ // To sarch games by score (useful for running games)
+ objectStore.createIndex("score", "score", { unique: false });
+ if (!objectStore.indexNames.contains("created"))
+ // To search by date intervals. Two games cannot start at the same time
+ objectStore.createIndex("created", "created", { unique: true });