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Discover why Flutter apps experience issues writing data to Firestore in release mode and how to fix it effectively.
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This video is based on the question https://stackoverflow.com/q/63893176/ asked by the user 'Sebastián Fernández' ( https://stackoverflow.com/u/14249181/ ) and on the answer https://stackoverflow.com/a/64361619/ provided by the user 'Sebastián Fernández' ( https://stackoverflow.com/u/14249181/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Why Your Flutter App Fails to Write Data to Firestore in Release Mode

Have you ever encountered a situation where your Flutter app runs perfectly in debug mode but fails to write data to Firestore in release mode? You're not alone in facing this issue. It can be frustrating, especially when everything seems to function well, yet you're not able to see the expected results in your production environment. In this post, we will explore a common pitfall while using Firebase Firestore with Flutter and how to remedy it effectively.

Understanding the Problem

When a user signs in successfully using Google authentication, your app should ideally create or update a document in Firestore if the user doesn't already have one. This is what usually happens in your debug environment. However, once you switch to release mode, you've noticed that no data is written to Firestore, and no errors are thrown.

This has several implications:

User data is not stored, leading to a lack of persistence.

You can't troubleshoot effectively because you're not receiving error messages to guide you.

Analyzing the Code

Let's first take a look at a snippet of the code where the problem lies, specifically in the signInWithGoogle() function:

[[See Video to Reveal this Text or Code Snippet]]

Debugging the Code

In debug mode, assert statements help ensure certain conditions are met. However, these assertions are disabled when you run your app in release mode. This means the code may not perform as expected without throwing an error.

Common Solution

Instead of using assert, it is advisable to add regular if conditions to check for the conditions you previously asserted. This ensures your code behaves consistently in both debug and release modes.

Revised Code Example

Here’s how you can adjust your signInWithGoogle() method:

[[See Video to Reveal this Text or Code Snippet]]

This will ensure that your checks are always carried out, regardless of the execution mode of your app.

Conclusion

Debugging Flutter apps can be complex, especially when switching modes. The issue of Firestore data not being written in release mode can often boil down to assertions being disabled. By substituting your assertions with standard conditional checks, you can ensure that your app runs smoothly across all environments.

Further Tips

Always test your app in both debug and release modes to catch such issues early.

Regularly review Firestore security rules and console output for any hidden responses from your database calls.

By keeping these strategies in mind, you can not only overcome this specific issue but also prevent future problems in your app's development lifecycle.