Support mapping of polymorphic collection with abstract parent type #4304
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| { | ||
| var instanceParameter = Parameter(request.SourceType, "dto" + request.SourceType.Name); | ||
| var projection = CreateProjectionCore(request, instanceParameter, typeMap, letPropertyMaps); | ||
| var projection = !typeMap.DestinationType.IsAbstract |
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A better fix is to simply skip abstract types when computing polymorphic maps.
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I disagree with that, or perhaps I don't see how to do it this way at this level.
Because the abstract type mapping don't come from the polymorphic map but from the EnumerableProjectionMapper.Project method.
This is because it is this abstract type that is used for the collection property in the entity.
I don't see how I can filter it before this moment.
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I guess both make sense, projecting to an abstract type when there are included maps and also including an abstract map, presumably for configuration reuse.
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When mapping a polymorphic list with an abstract parent, the expression throw an exception on create.
It try to use a new expression of the abstract type which is not possible.
So replace it with a default value expression which is allowed and not throw an error.