Flutter/Dart - How to force override a getter & setter or any method in a class that is extending an abstract class?

user_8112679 0
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Scenario:

For example, I have the following abstract class Synchronizable:

abstract class Synchronizable {
  /// Getter & setter for sync status of the current data
  bool get synced;

  set synced(bool status);

  /// Method that will be called to execute the synchronization process
  Future<Either<Error, dynamic>> onSync();
}

As you can see the class has 3 different abstract methods:

  1. Getter for synced bool value
  2. Setter for synced bool value
  3. An abstract method onSync to perform synchronization

I have extended the class in one dummy implementation for this question:

class DummyImpl extends Synchronizable {

}

The IDE gave me an error/warning to must override abstract methods, but the method count was not 3, it was 2.

Prompt to implement abstract methods

When I implemented using the prompt, It overrode only 2 methods. The getter & the onSync method.

Auto complete to override abstract methods

Note: The error is gone from the class name, meaning the override was successful & did not miss any method to override.

Question(s):

  1. How do I force override of the setter method in this case?
  2. Why is the compiler skipping the setter for the override? (Not important but curious about this)

Update:

From the responses I got, It seems that getter/setters are replaced with a member directly by the compiler. However the main question still remains unanswered, how do I force override the any methods.

To reflect the same intention, I have updated the Question title as well. Please respond to solve that part.

Thank you.

dart flutter oop
2 Answers

Well, a getter and a setter will allow you to do this:

instance.synced = true; // calling setter

and

print(instance.synced); // calling getter

It seems the shortest solution to provide this abilities to your class is to do exactly what your compiler did:

@override
bool synced;

You can set it. You can get it. Both don't do any additional work. But that is not what abstract enforces anyway. It just enforces it to be overriden, you cannot keep a derived class from doing nothing when overriding your methods. You cannot force anybody to actually put code in there.

Your constraints were satisfied. The derived class has a getter and setter for synced.

user_20607250

Because your setter has the same name the getter. So basically, the compiler skip the setter after overriding the getter. You can change the name of your setter.

user_72768400
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