ManyValuedAssociations on AbstractEntities

BIZ TMS Aurelius
1

In 5.11 you gave us functionality of using Associations in AbstractEntities.

Now I'm trying to use ManyValuedAssociations in AbstractEntities. Looks like, this is not supported right now.

I got

Class ... is not a valid Entity. [Entity] attribute missing or entity does not belong to model.

2

How are your mapping and the error message, exactly? You can add a ManyValuedAssociation attribute to an abstract entity, but the associated entity can't be abstract. This is valid for both associations and many-valued associations.

3

I got this EInvalidEntity-Exception:

Error mapping entity type Entities.TAbstractEntity: Class TAbstractEntity is not a valid Entity. [Entity] attribute missing or entity does not belong to model. (EInvalidEntity)

This is my EntityMapping out of my Demo-Project:

  [AbstractEntity, Automapping]
  TAbstractEntity = class abstract
  private
    FId: Integer;

    [ManyValuedAssociation([], CascadeTypeAllRemoveOrphan)]
    FChild: TList<TChild>;
  public
    constructor Create;
    destructor Destroy; override;

    property Id: Integer read FId write FId;
    property Child: TList<TChild> read FChild write FChild;
  end;

  [Entity, Automapping]
  TEntityOne = class(TAbstractEntity)
  private
    FDummy: string;
  public
    property Dummy: string read FDummy write FDummy;
  end;

  [Entity, Automapping]
  TEntityTwo = class(TAbstractEntity)
  private
    FDummyTwo: string;
  public
    property DummyTwo: string read FDummyTwo write FDummyTwo;
  end;

  [Entity, Automapping]
  TChild = class
  private
    FId: Integer;
  public
    property Id: Integer read FId write FId;
  end;

This is my callstack leading to this error:

Aurelius.Mapping.Explorer.TMappingExplorer.EntityTypeFromClass(TAbstractEntity)
Aurelius.Mapping.Automapping.TAutomapping.AutoGetColumnsFromManyValuedAssociationMember($7BBB7D0)
Aurelius.Mapping.Automapping.TAutomapping.AutoGetColumnsFromAssociationMember($7BBB7D0)
Aurelius.Mapping.Explorer.TMappingExplorer.DefineMetaProperties.AutoMap$ActRec.$0$Body
Aurelius.Mapping.Explorer.TMappingExplorer.LoadPropColumns($42671E0)
Aurelius.Mapping.Explorer.TMappingExplorer.GetColumnsFromProp($42671E0)
Aurelius.Mapping.Explorer.TMappingExplorer.DefineColumns($4285308,TAbstractEntity)
Aurelius.Mapping.Explorer.TMappingExplorer.LoadMapping$ActRec.$1$Body($4285308)
Aurelius.Mapping.Explorer.TMappingExplorer.LoadDetailedAbstractMapping(TMappingExplorer.LoadMapping$ActRec($428DE6C) as {System.SysUtils}TProc<Aurelius.Mapping.Metadata.TAbstractEntityType>,$4285308,$7BB4970)
Aurelius.Mapping.Explorer.TMappingExplorer.ProcessMappedAbstractEntities(TMappingExplorer.LoadMapping$ActRec($428DE6C) as {System.SysUtils}TProc<Aurelius.Mapping.Metadata.TAbstractEntityType>)
Aurelius.Mapping.Explorer.TMappingExplorer.LoadMapping
Aurelius.Mapping.Explorer.TMappingExplorer.FindAbstractEntityType(TChild)
Aurelius.Mapping.Explorer.TMappingExplorer.FindEntityType(TChild)
Aurelius.Mapping.Explorer.TMappingExplorer.GetInheritanceStrategy(TChild)
Aurelius.Mapping.Explorer.TMappingExplorer.InheritsTable(TChild)
Aurelius.Mapping.Explorer.TMappingExplorer.HasTable(TChild)
Aurelius.Engine.DatabaseManager.TDatabaseManager.BuildDatabaseMetadata($4170E10)
Aurelius.Engine.DatabaseManager.TDatabaseManager.ValidateDatabase
Aurelius.Engine.DatabaseManager.TDatabaseManager.UpdateDatabase
4

I'm sorry, I stand corrected. Many-valued associations are indeed not supported in abstract entities, simply because they need to have the other-side of the association, which references back to the original abstract entity.

Abstract entities cannot be referenced in associations, thus a many-valued association is not possible.