How to Generate Json_Serializable Dart (Flutter) for Inheritance Classes скачать в хорошем качестве

How to Generate Json_Serializable Dart (Flutter) for Inheritance Classes

Discover how to handle `Json_Serializable` in Dart and Flutter when working with inheritance classes, ensuring smooth JSON conversion. --- This video is based on the question https://stackoverflow.com/q/72877711/ asked by the user 'Sapatekno' ( https://stackoverflow.com/u/12117042/ ) and on the answer https://stackoverflow.com/a/72877888/ provided by the user 'Nikunj Ramani' ( https://stackoverflow.com/u/9244109/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: How to Generate Json_Serializable Dart (Flutter) on Inheritance class? Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l... The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- How to Generate Json_Serializable Dart (Flutter) for Inheritance Classes In the world of Flutter and Dart, handling JSON data efficiently is crucial, especially when dealing with classes that inherit from other classes. In this article, we're going to address a common issue that arises when using the Json_Serializable library with inheritance models. Specifically, we'll look at how to resolve errors related to JSON serialization that occur when building classes that inherit from parent classes. The Problem at Hand Imagine you've defined two parent classes: Student and Room. You then create two corresponding models: StudentModel and RoomModel, both inheriting from their respective parent classes. You attempt to generate JSON converters using the Json_Serializable library but run into an error. The error message might look something like this: [[See Video to Reveal this Text or Code Snippet]] This indicates that the build_runner was unable to generate the toJson method for the studentRoom type, which is probably set as Room while having a model RoomModel available. Let's break down the solution to fix this. Understanding the Error The error occurs because the generator does not recognize that studentRoom should be mapped to RoomModel. This confusion arises from the fact that the parent class is being directly referenced in the JSON serialization process. To resolve this, you'll need to provide specific instructions on how to handle instances of Room in the context of serialization. The Solution To correct this problem, you have a couple of approaches. Below, I will outline the most straightforward method, which involves ensuring that your JSON serialization correctly recognizes RoomModel as the proper type to use. Step-by-Step Solution Modify the StudentModel Class: Ensure the studentRoom field in StudentModel uses RoomModel instead of Room. Here's the updated code: [[See Video to Reveal this Text or Code Snippet]] A Breakdown of Changes Made: Updated StudentModel constructor: Now initializes studentRoom with RoomModel instead of attempting to reference Room. Ensured complete JSON serialization: The @ JsonSerializable(explicitToJson: true) annotation is maintained to handle nested conversions. Conclusion With these adjustments, you should be able to generate the desired JSON converters without encountering errors related to inheritance. The key takeaway is ensuring that your serialization process recognizes the correct model types. Following this step-by-step solution will make your data handling much smoother. Feel free to reach out with any additional questions or concerns about using JSON serialization in Dart and Flutter. Happy coding!