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Learn how to handle multiple `StreamProviders` of the same data type in Flutter by using a custom model class to differentiate between them.
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This video is based on the question https://stackoverflow.com/q/63065920/ asked by the user 'Nathan Gong' ( https://stackoverflow.com/u/13615679/ ) and on the answer https://stackoverflow.com/a/63066474/ provided by the user 'Jagraj Singh' ( https://stackoverflow.com/u/10523776/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Use Multiple Stream Providers of the Same Data Type in Flutter

In Flutter development, we often need to work with real-time data from external sources, such as databases. Using StreamProviders is a common approach to listen for data changes. However, developers sometimes encounter issues when trying to use multiple StreamProviders for the same data type, leading to conflicts where one provider overrides another. In this guide, we will explore how to solve this problem by utilizing custom classes to differentiate between the providers.

Understanding the Problem

Imagine you are developing a Flutter application that retrieves data from two different Firebase collections, both yielding QuerySnapshot types. If you try to set up two StreamProviders in the following way:

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You might run into an issue where the second provider overwrites the data from the first, leading to unexpected behavior in your application. So, how do we fix this?

The Solution: Use Custom Classes

Yes, there is always a way to handle this scenario! The best approach is to create a custom class that encapsulates the QuerySnapshot. By doing this, you can easily differentiate between the two stream providers without them interfering with each other.

Step 1: Create a Custom Class

First, create a simple custom class to hold your QuerySnapshot:

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Step 2: Modify One of Your Stream Providers

Next, you need to modify one of your StreamProviders to use the new custom class:

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Step 3: Accessing the Data

To access the data in your widget, simply retrieve the provider for your custom class:

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By wrapping your QuerySnapshot in a custom class, you have effectively distinguished one stream provider from another, allowing both to coexist without issues.

Conclusion

Using multiple StreamProviders of the same data type in Flutter isn't just possible; it’s also manageable by applying a few simple design principles. By creating a custom class to encapsulate your data, you can effectively prevent any conflicts between providers and ensure your application runs smoothly.

Now you can confidently implement multiple StreamProviders in your Flutter app without running into conflicts!