reading enum from ConstantReader

[Huholoman]

Hello,
Im trying to get enum from ConstantReader. Ive found your library and tried to use it.

I have annotation with StrategyEnum? strategy property. So In my code where Im trying to read the strategy property I tried this

final strategy = constantReader.get<StrategyEnum?>();

Unfortunately it threw error: ErrorOf<ConstantReader>: "Input does not represent an object of type <StrategyEnum?>"

I think I may be using your generic_reader incorrectly as I would expect get method to accept property name 🤔

Thanks in advance!

[simphotonics]

The extension GenericReader can handle Dart enums and in the following I am assuming that StrategyEnum is a Dart enum. However, StrategyEnum? is a completely different type that is not known to GenericReader, unless you define a custom Decoder.

You could either:

1. define a Decoder that can handle StrategyEnum?:

 // Adding a decoder for constants of type StrategyEnum?.
  GenericReader.addDecoder<StrategyEnum?>((constantReader) {
    if (constantReader.isNull) { 
       return null;
    }else{
       return constantReader.get<StrategyEnum>();
    }
 });   

2. If it is your code, I would recommend refactoring the variable strategy by making it non nullable. For example, you could use Strategy.none to represent the absence of a strategy instead of null.
   Then you can use:

final strategy = constantReader.get<StrategyEnum>();