"Instances of abstract classes cannot be created" exception for classes with JObject properties about mapster HOT 5 CLOSED

I also have this issue. Problem is JObject contains internal setter like Parent, Next, Previous (which Mapster will translate type as class rather than primitive). Then, Mapster try to perform deep copy, but Parent, Next, Previous are JToken which is abstract. Currently, I solve this problem by using MapWith to perform direct copy.

TypeAdapterConfig<JObject, JObject>.NewConfig().MapWith(src => src);
TypeAdapterConfig<JArray, JArray>.NewConfig().MapWith(src => src);
TypeAdapterConfig<JValue, JValue>.NewConfig().MapWith(src => src);
TypeAdapterConfig<JToken, JToken>.NewConfig().MapWith(src => src);

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You can close this issue if you want, search should help others who may stumble over the same problem

from mapster.

Do you have idea to improve this? Will it help if I add another method explicitly like TypeAdapterConfig.Default.AddPrimitiveType<JObject>()? If you have better name or better idea, pls suggest.

from mapster.

I actually like the syntax we currently have: TypeAdapterConfig<JArray, JArray>.NewConfig().MapWith(src => src);.
It's clear and explicit and it doesn't add any extra methods to know about, so user uses the same, already known grammar set for this library. Also it helps when you're searching for a particular mapping - I can search for all lines using same pattern - TypeAdapterConfig<JValue - finds all mappings from JValue
and TypeAdapterConfig<[^,],JValue> finds me all mappings to JValue.

It may be worth to put an extra line or two in docs about this, as I'm sure that many users map objects that are coming from API (cross-domain boundary) e.g. in Json or XML or other cross-platform format.

from mapster.

I just added a couple of lines for MapWith in doc.

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