private static DiscriminatorBuilder DiscriminatorBuilder(
IMutableEntityType entityType,
[NotNull] PropertyBuilder discriminatorPropertyBuilder)
{
var rootTypeBuilder = new EntityTypeBuilder(entityType.RootType());
var discriminatorProperty = (IConventionProperty)discriminatorPropertyBuilder.Metadata;
// Make sure the property is on the root type
discriminatorPropertyBuilder = discriminatorProperty.GetTypeConfigurationSource() != null
? rootTypeBuilder.Property(discriminatorProperty.ClrType, discriminatorProperty.Name)
: rootTypeBuilder.Property(discriminatorProperty.Name);
var oldDiscriminatorProperty = entityType.GetDiscriminatorProperty() as IConventionProperty;
if (oldDiscriminatorProperty?.Builder != null &&
oldDiscriminatorProperty != discriminatorProperty)
{
oldDiscriminatorProperty.DeclaringEntityType.Builder.RemoveUnusedShadowProperties(
new[]
{
oldDiscriminatorProperty
});
}
rootTypeBuilder.Metadata.SetDiscriminatorProperty(discriminatorProperty);
discriminatorPropertyBuilder.IsRequired();
discriminatorPropertyBuilder.HasValueGenerator(DiscriminatorValueGenerator.Factory);
return(new DiscriminatorBuilder(entityType));
}
/// <summary>
/// Sets the <see cref="IProperty" /> that will be used for storing a discriminator value.
/// </summary>
/// <param name="entityType"> The entity type to set the discriminator property for. </param>
/// <param name="property"> The property to set. </param>
public static void SetDiscriminatorProperty([NotNull] this IMutableEntityType entityType, [CanBeNull] IProperty property)
{
CheckDiscriminatorProperty(entityType, property);
var oldDiscriminatorType = entityType.GetDiscriminatorProperty()?.ClrType;
if (property == null ||
property.ClrType != oldDiscriminatorType)
{
foreach (var derivedType in entityType.GetDerivedTypesInclusive())
{
derivedType.RemoveDiscriminatorValue();
}
}
entityType.SetOrRemoveAnnotation(RelationalAnnotationNames.DiscriminatorProperty, property?.Name);
}