Derived types single configuration for base type configurations

https://github.com/riok/mapperly/issues/330 / https://github.com/riok/mapperly/pull/366 added support for derived type mappings. As of now, if a property needs a configuration on the base type (eg. MapProperty) it needs to be done for each individual type. The configuration could be simplified a lot, when the configuration could happen on the base type method.

Classes:

abstract class Car { public int Age { get; set; } }
class Audi : Car {}
class Porsche : Car {}

abstract class CarDto {  public int Age2 { get; set; } }
class AudiDto : CarDto {}
class PorscheDto : CarDto {}

Configuration on base type mapping method:

[Mapper]
public static partial class ModelMapper
{
    [MapDerivedType<Audi, AudiDto>]
    [MapDerivedType<Porsche, PorscheDto>]
    [MapProperty("Age", "Age2")] // this does not work here...
    public static partial CarDto MapCar(Car source);
}

Current required configuration:

[Mapper]
public static partial class ModelMapper
{
    [MapDerivedType<Audi, AudiDto>]
    [MapDerivedType<Porsche, PorscheDto>]
    public static partial CarDto MapCar(Car source);
    
    [MapProperty("Age", "Age2")]
    private static partial PorscheDto MapPorsche(Porsche source);
    
    [MapProperty("Age", "Age2")]
    private static partial AudiDto MapPorsche(Audi source);
}

[onionhammer]

@latonz Yeah I just bumped into it naturally using the ‘next’ release, so I imagine anyone using derived mappings will run into it pretty quickly

[github-actions[bot]]

🎉 This issue has been resolved in version 3.0.0 🎉

The release is available on:

• GitHub release
• v3.0.0

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