What is the equivalent of entityEntry.Metadata.DefiningNavigationName() in EF Core 6?

Solution 1:

Shared entity types are entity types which use common CLR type (class), and are identified by the entity type name (since the type is not enough).

Owned entity types now are implemented as shared types. The name of owned entity type consists of the name of the owner type + navigation property + type name. e.g. something like {Namespace}.{OwnerType}.{Navigation}#{OwnedType}.

So one way to adjust the above code is check the name of the entity in interest and just test directly for it. Another way closer to what are you doing before is to check the CLR type and in case it is owned, the navigation property name from owner to owned (the equivalent of the "defining navigation name"), which can be obtained with FindOwnership().PrincipalToDependent.Name, e.g. something like

if (entityEntry.Metadata.ClrType == typeof(ArticleTag)
    && entityEntry.Metadata.FindOwnership()?.PrincipalToDependent?.Name != "Tags")