Add a displayableProps

[Ilyas LEFEBVRE]

Hello @felangel,
Thank you very much for your work on all the packages. 🎆

Sometimes you need to compare objects on certain fields, but to display others using the toString.

abstract class Equatable {
  List<Object> get props;

  List<Object> get displayableProps => props;
}

Display all the props.
This is the default behavior.

class Foo extends Equatable {
  // Fields

  @override
  List<Object> get props => <Object>[
      foo,
      bar,
      baz,
      foobar,
  ];
}

Display and compare different fields.

class Foo extends Equatable {
  // Fields

  @override
  List<Object> get props => <Object>[
      foo,
      bar,
  ];

  @override
  List<Object> get displayableProps => <Object>[
      baz,
      foobar,
  ];
}

Display all properties except one

class Foo extends Equatable {
  // Fields

  @override
  List<Object> get props => <Object>[
      foo,
      bar,
      baz,
      foobar,
  ];

  @override
  List<Object> get displayableProps => props.removeAt(0);
}

[Felix Angelov]

Hi @LefebvreIlyas 👋
Thanks for opening an issue!

If you would like custom toString behavior, I would recommend just overriding toString manually for the one-off cases.

class Foo extends Equatable {
  // Fields

  @override
  List<Object> get props => <Object>[
      foo,
      bar,
      baz,
      foobar,
  ];

  @override
  String toString() => 'Foo($bar, $baz, $foobar)`;
}

Hope that helps! Closing for now but feel free to comment with additional comments/questions and I'm happy to continue the conversation 👍