MapsterMapper/Mapster
Can't use conditional mapping with different types of source field
Aberta
#673 aberto em 1 de fev. de 2024
help wantedimprovement
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Description
For example there are 2 classes:
public class Source
{
public int? IntValue { get; set; }
public string StringValue { get; set; } = "Some Value";
}
public class Destination
{
public string Mapped { get; set; } = string.Empty;
}
The task is put in Mapped string representation of IntValue if it's not null, otherwise use StringValue. I assume configuration should look like (according to Mapster docs):
TypeAdapterConfig.GlobalSettings
.NewConfig<Source, Destination>()
.Map(dest => dest.Mapped, src => src.IntValue, src => src.IntValue.HasValue)
.Map(dest => dest.Mapped, src => src.StringValue);
But it gives runtime exception:
Mapster.CompileException: Error while compiling
source=Source
destination=Destination
type=Map
---> System.InvalidOperationException: No coercion operator is defined between types 'System.Nullable`1[System.Int32]' and 'System.String'.
Is it intended behavior or it's a bug? How to perform conditional mapping in given case Mapster way, without slapping .AfterMapping() and do it with custom code?