How to Properly Store Data Retrieved from Firebase into Variables in Flutter

Описание: Learn how to effectively store data retrieved from Firebase into variables in your Flutter application to ensure a seamless experience.
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This video is based on the question https://stackoverflow.com/q/68548942/ asked by the user 'kiku' ( https://stackoverflow.com/u/16399079/ ) and on the answer https://stackoverflow.com/a/68549023/ provided by the user 'Renaud Tarnec' ( https://stackoverflow.com/u/3371862/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Storing Data Retrieved from Firebase into Variables in Flutter

When building a Flutter application that interacts with Firebase, you may encounter a common issue—how to store the data retrieved from Firebase (like customer names and IDs) into variables so that you can use them later. This is essential for various tasks, including submitting user data or updating records. In this guide, we’ll explore a simple but effective solution to address this problem.

The Challenge

Imagine you're trying to fetch customer data from Firebase, specifically their names and IDs. You successfully retrieve this data and can print it to your console, but you find it tricky to store this information in variables for later use. The task at hand is twofold:

Retrieve customer details from Firebase.

Store these details in variables for future operations, like saving to another Firebase path.

Let’s take a closer look at the code snippet you might be working with:

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The Solution

Understanding Asynchronous Programming

In Flutter, when dealing with Firebase or any external data source, many operations are asynchronous. This means that functions like retrieving data or saving data to Firebase may not complete immediately and instead take some time to finish.

In your original initializeOrder() function, you were calling getNameAddress() without waiting for it to complete. Because of this, the variables cusName and add may still be uninitialized when you attempt to send your data to Firebase. To resolve this, you must make two crucial adjustments.

Steps to Resolve the Issue

Make initializeOrder Asynchronous: Change the function to be async.

Use await: Call getNameAddress() with the await keyword to ensure that it finishes executing before moving on.

Here’s the revised version of your code:

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

What Changed?

Awaiting the Get Name Address: By adding await before your getNameAddress() call, you ensure that the values of cusName and add are set before you pass them to Firebase.

Making it Async: Declaring initializeOrder as async allows it to work seamlessly with asynchronous calls.

Conclusion

Storing values retrieved from Firebase requires a solid understanding of asynchronous programming in Flutter. By following the structured steps outlined above, you can effectively manage your data retrieval and ensure your variables are populated correctly before attempting to use them. With this approach, you’ll create a more fluid experience in your app, ensuring that user data is consistently stored and updated without hitches.

Implementing this solution will save you time and reduce errors in your app, leading to a smoother user experience and more reliable data management. Happy coding!