Config for nested mapping (original) (raw)
For example if you have parent and child classes.
class ParentPoco { public string Id { get; set; } public List Children { get; set; } public string Name { get; set; } } class ChildPoco { public string Id { get; set; } public List GrandChildren { get; set; } } class GrandChildPoco { public string Id { get; set; } }
And if you have setting on parent type.
TypeAdapterConfig<ParentPoco, ParentDto>.NewConfig() .PreserveReference(true);
By default, children types will not get effect from PreserveReference.
To do so, you must specify all type pairs inside ParentPoco.
TypeAdapterConfig<ParentPoco, ParentDto>.NewConfig() .PreserveReference(true); TypeAdapterConfig<ChildPoco, ChildDto>.NewConfig() .PreserveReference(true); TypeAdapterConfig<GrandChildPoco, GrandChildDto>.NewConfig() .PreserveReference(true);
Or you can set PreserveReference in global setting.
TypeAdapterConfig.GlobalSettings.Default.PreserveReference(true);
Fork
You can use Fork command to define config that applies only specified mapping down to nested mapping without polluting global setting.
TypeAdapterConfig<ParentPoco, ParentDto>.NewConfig() .Fork(config => config.Default.PreserveReference(true));
Ignore if string is null or empty
Another example, Mapster only can ignore null value (IgnoreNullValues), however, you use Fork to ignore null or empty.
TypeAdapterConfig<ParentPoco, ParentDto>.NewConfig() .Fork(config => config.ForType<string, string>() .MapToTargetWith((src, dest) => string.IsNullOrEmpty(src) ? dest : src) );