Fixing the NotFoundError in IndexedDB

Описание: Learn how to resolve the `NotFoundError` issue in IndexedDB within your ReactJS Progressive Web App. Follow our step-by-step guide to ensure your database transactions execute smoothly.
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This video is based on the question https://stackoverflow.com/q/64151366/ asked by the user 'Shantanu' ( https://stackoverflow.com/u/8775730/ ) and on the answer https://stackoverflow.com/a/64152382/ provided by the user 'Shantanu' ( https://stackoverflow.com/u/8775730/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Fixing the NotFoundError in IndexedDB: A Comprehensive Guide

When building applications with ReactJS, particularly Progressive Web Apps (PWAs), developers often leverage IndexedDB for client-side data storage. However, it's not uncommon to encounter errors during implementation. One such error is the NotFoundError: Failed to execute 'transaction' on 'IDBDatabase': One of the specified object stores was not found. This error typically occurs when the specified object store does not exist in the database, leading to transaction failures. In this guide, we will delve into the causes of this issue and provide a clear, step-by-step solution.

Understanding the Problem

The error arises when a transaction is initiated on an IndexedDB database but the particular object store referenced in the transaction does not exist. In our example, the object store is named "userdata" and is expected to be created during the database upgrade process. If the database's version is not correctly incremented or if the transaction is called prematurely (before the object store is created), the error will surface.

Key Points

Object store must be created before any transactions are made on it.

The database version must be incremented to trigger upgrades and create object stores.

Step-by-Step Solution

Step 1: Review Your Database Initialization

In the given code snippet, the database is opened but the request for the database is not inside the useEffect() hook where it should be. Moving it inside useEffect() ensures that it is executed once the component mounts.

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Step 2: Increment the Database Version

It's crucial to increment the database version each time you create or modify the schema, such as adding an object store. In the above code, changing the version number from 1 to 2 triggers the onupgradeneeded event, allowing you to create the necessary object store.

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Step 3: Create the Object Store in the Upgrade Process

During the onupgradeneeded event, ensure that the object store is being created. Here’s how you can structure this event:

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Step 4: Handle Transaction After Successful Upgrade

Once the object store is created, you can then handle the successful database open and create a transaction on your object store. Make sure this part is done in the onsuccess callback:

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Conclusion

By following the steps outlined above, you can successfully troubleshoot the NotFoundError in your IndexedDB transactions within ReactJS applications. Always remember to check your database versioning and the lifecycle of your IndexedDB operations as these are critical to avoiding similar issues in the future. With this guide, you should now be equipped to fix the error and ensure a smooth experience in managing your application's database.

Happy Coding!