Ah I see what I did. I was literally trying to save the unmapped
SocketGuild, presented a different collection instance than the one I had
intended. Oops!
On Saturday, June 21, 2025 at 4:09:28 PM UTC-4 Michael W Powell wrote:
> Hello,
>
> In my class map, I have the following.
>
> public class DiscordGuidMap : DiscordModelBaseMap<DiscordGuild,
> SocketGuild>
> {
> public DiscordGuidMap() : base()
> {
> Map(x => x.Name)
> .Length(DiscordModelBase.NameMaxLength)
> .Not.Nullable();
>
> Map(x => x.Description)
> .Length(DiscordGuild.DescriptionMaxLength)
> .Nullable();
>
> HasMany(x => x.TextChannels)
> .AsBag()
> .Cascade.AllDeleteOrphan().Inverse();
> }
> }
>
> There is an internal property Source which we pick up the SocketGuild in
> this case, and for DiscordTextChannel the SocketTextChannel as well.
>
> These are properly unmapped, should not be mapped.
>
> I got this to save or update "once" now does not seem to work again,
> getting the infamous "no persister for". Now with the exception messages:
>
> - $exception {"An invalid or incomplete configuration was used while
> creating a SessionFactory. Check PotentialReasons collection, and
> InnerException for more detail.\r\n\r\n"}
> FluentNHibernate.Cfg.FluentConfigurationException
> + InnerException {"Could not determine type for:
> Discord.WebSocket.SocketGuild, Discord.Net.WebSocket, Version=3.15.3.0,
> Culture=neutral, PublicKeyToken=null, for columns:
> NHibernate.Mapping.Column(Source)"} System.Exception
> {NHibernate.MappingException}
>
> Note, there should NOT be a persister for Source, nor do we want to map
> that property, it is strictly for internal use only.
>
> My mappings are properly configured including ClassMap<t> from the
> appropriate assemblies.
>
> private static void OnMappingConfiguration<TMappingProvider,
> TConvention>(MappingConfiguration mappingConfiguration)
> where TMappingProvider : class, IMappingProvider
> where TConvention : class, IConvention
> {
> mappingConfiguration.FluentMappings
> .Conventions.AddFromAssemblyOf<TConvention>()
> .AddFromAssemblyOf<TMappingProvider>();
> }
>
> private static (string appSettingsPath, Action<MappingConfiguration>
> onMapping, Action<Configuration> onExpose) _configurationHandlers = (
> "appsettings.json"
> , OnMappingConfiguration<CredentialMap, PrimaryKeyConvention>
> , delegate { }
> );
>
> And we deconstruct the tuple and use accordingly in the correct places.
> We're "this far" as evidence things are wired and plumbed correctly.
>
> The only way we could be getting that exception is if somehow Source is
> somehow being seen and included in the map, which it should not be. And
> solutions I have seen in some forums to annotate with an [Ignore] or
> perhaps [NotMapped attribute, not a desirable approach, starts getting
> overtly invasive of the mapped models. Besides which, we are not auto
> mapping, but rather fluent ClassMap mapping.
>
> Any thoughts how to contend with this?
>
> Thank you!
>
> Best,
>
> Michael W. Powell
>
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