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Learn how to efficiently pass a single school object from a list to an edit page in Flutter using the Provider pattern.
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This video is based on the question https://stackoverflow.com/q/65189167/ asked by the user 'Sam' ( https://stackoverflow.com/u/6047107/ ) and on the answer https://stackoverflow.com/a/65189766/ provided by the user 'Migalv' ( https://stackoverflow.com/u/12624200/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Passing a Single School Object Using Flutter Provider

When developing Flutter applications, one common challenge developers face is how to manage state and share data efficiently across different widgets. In this post, we will cover how to pass a single object from a ListView to an edit page using the Provider pattern in Flutter. Specifically, we will focus on passing a School object when a user clicks on a school's entry in the list.

The Problem

Imagine you have a list of schools displayed on a screen, and you want to allow users to edit the details of a school after clicking on it. The requirement is clear: you need to securely pass the selected School object to an edit screen without relying on constructors. This is a very common scenario when building mobile applications, especially in scenarios involving forms and data management.

Example Scenario

A user navigates to the "My Schools" screen that shows a list of schools.

By clicking on any school in the ListView, the user should be taken to the edit page for that particular school.

After editing, the updated information should reflect back on the original ListView screen seamlessly.

The Solution

To achieve this, we'll utilize the Provider package to manage our school's data. Below, we will break down the steps and modify the original code structure for better management of state and object passing.

Step 1: Update the Provider

First, let’s modify the provider to manage a list of schools. This will allow us to update the state when a school is added, removed, or updated:

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

Step 2: Update the ListPage Widget

Next, we will modify the ListSchool widget to utilize the new SchoolsProvider. This will allow us to access the list of schools and to navigate to the edit page with the selected school:

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

Step 3: Create the Edit Page

Finally, create the NewPage which will accept the School object and allow users to make edits:

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

Explanation of the Code

Provider: We refactored the SchoolProvider to manage a list of schools, allowing easy updates and notifications to listeners.

Consumer: In the ListSchool widget, we used the Consumer widget that listens to changes in the SchoolsProvider and rebuilds whenever the school data is modified.

Navigation: When a school is tapped, it calls Navigator.push() to navigate to the edit page while passing the selected School object.

Conclusion

By utilizing the Provider pattern, we were able to effectively manage state and pass a single School object from a list to an edit page without relying on constructors. This method is not only efficient but also keeps your code clean and organized, which is essential for maintaining large applications.

By following these outlined steps, you should now be equipped to handle similar scenarios in your Flutter applications!