Eccezione Entity Framework Core, NpgSql e Postgis

Ho seguito questa documentazione per utilizzare i dati spaziali nel mio progetto.

Ho installato l'estensione postgis con Stack Builder, ho creato il modello, la migrazione, l'ho applicato e tutto è andato bene.

Il problema è quando eseguo il progetto. La prima volta che richiede il database, ho ottenuto questa eccezione:

System.InvalidOperationException
  HResult=0x80131509
  Message=The property 'Point.Boundary' is of an interface type ('IGeometry'). If it is a navigation property manually configure the relationship for this property by casting it to a mapped entity type, otherwise ignore the property using the NotMappedAttribute or 'EntityTypeBuilder.Ignore' in 'OnModelCreating'.
  Source=Microsoft.EntityFrameworkCore
  StackTrace:
   at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.PropertyMappingValidationConvention.Apply(InternalModelBuilder modelBuilder)
   at Microsoft.EntityFrameworkCore.Metadata.Conventions.Internal.ConventionDispatcher.ImmediateConventionScope.OnModelBuilt(InternalModelBuilder modelBuilder)
   at Microsoft.EntityFrameworkCore.Infrastructure.ModelSource.CreateModel(DbContext context, IConventionSetBuilder conventionSetBuilder, IModelValidator validator)
   at System.Lazy`1.ViaFactory(LazyThreadSafetyMode mode)
   at System.Lazy`1.ExecutionAndPublication(LazyHelper executionAndPublication, Boolean useDefaultConstructor)
   at System.Lazy`1.CreateValue()
   at Microsoft.EntityFrameworkCore.Internal.DbContextServices.CreateModel()
   at Microsoft.EntityFrameworkCore.Internal.DbContextServices.get_Model()
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScoped(ScopedCallSite scopedCallSite, ServiceProviderEngineScope scope)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitConstructor(ConstructorCallSite constructorCallSite, ServiceProviderEngineScope scope)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScoped(ScopedCallSite scopedCallSite, ServiceProviderEngineScope scope)
   at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider provider, Type serviceType)
   at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService[T](IServiceProvider provider)
   at Microsoft.EntityFrameworkCore.DbContext.get_DbContextDependencies()
   at Microsoft.EntityFrameworkCore.DbContext.get_InternalServiceProvider()
   at Microsoft.EntityFrameworkCore.Internal.InternalAccessorExtensions.GetService[TService](IInfrastructure`1 accessor)
   at Fleet.Data.Infrastructure.DbContextExtensions.EnsureMigrated(FleetDbContext context) in d:\WorkingCopy\fleet\Fleet.Data\Infrastructure\FleetDbContext.cs:line 99
   at Fleet.Startup.Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory) in d:\WorkingCopy\fleet\Fleet\Startup.cs:line 267

L'unico modo per continuare a eseguire il progetto è aggiungere l'attributo NoMapping alla proprietà dei dati spaziali del mio modello:

using System;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using NetTopologySuite.Geometries;

namespace Fleet.Data.Models
{

    public enum GpsSources
    {
        Unknown = 0,
        Shift,
        Refuelling,
        Transport,
        Assistance,
        Workshop
    }


    public class Gps
    {

        [Key]
        public int Id { get; set; }


        [Required]
        public virtual Vehicle Vehicle { get; set; }


        [Required]
        [NotMapped]
        public Point Location { get; set; }


        public string Description { get; set; }

        public GpsSources Source { get; set; }

        public int SourceId { get; set; }

        [Required]
        public virtual ApplicationUser User { get; set; }

        public DateTime Date { get; set; }

    }
}

All'interno del metodo CreateDbContext, ho impostato l'uso della suite di topologia in questo modo:

var builder = new DbContextOptionsBuilder<FleetDbContext>();

builder.UseNpgsql(connectionString, o => o.UseNetTopologySuite());

E in OnModelCreating mi assicuro che l'estensione postgis sia presente in questo modo:

builder.HasPostgresExtension("postgis");

Nel database la colonna è stata creata correttamente.

"Location" "public"."geometry" NOT NULL,