Store null table name and TPH mapping strategy in the snapshot

src/EFCore.Design/Migrations/Design/CSharpSnapshotGenerator.cs

@@ -845,8 +845,8 @@ private void GenerateTableMapping(
  var table = StoreObjectIdentifier.Create(entityType, StoreObjectType.Table);
  var tableName = (string?)tableNameAnnotation?.Value ?? table?.Name;
  if (tableNameAnnotation == null
- && (tableName == null
-  || entityType.BaseType?.GetTableName() == tableName))
+ && entityType.BaseType != null
+ && entityType.BaseType.GetTableName() == tableName)
  {
  return;
  }

src/EFCore.Relational/Extensions/RelationalEntityTypeBuilderExtensions.cs

@@ -19,6 +19,9 @@ public static partial class RelationalEntityTypeBuilderExtensions
  /// Configures TPC as the mapping strategy for the derived types. Each type will be mapped to a different database object.
  /// All properties will be mapped to columns on the corresponding object.
  /// </summary>
+ /// <remarks>
+ /// See <see href="https://aka.ms/efcore-docs-inheritance">Entity type hierarchy mapping</see> for more information and examples.
+ /// </remarks>
  /// <param name="entityTypeBuilder">The builder for the entity type being configured.</param>
  /// <returns>The same builder instance so that multiple calls can be chained.</returns>
  public static EntityTypeBuilder UseTpcMappingStrategy(this EntityTypeBuilder entityTypeBuilder)
@@ -32,6 +35,9 @@ public static EntityTypeBuilder UseTpcMappingStrategy(this EntityTypeBuilder ent
  /// Configures TPH as the mapping strategy for the derived types. All types will be mapped to the same database object.
  /// This is the default mapping strategy.
  /// </summary>
+ /// <remarks>
+ /// See <see href="https://aka.ms/efcore-docs-inheritance">Entity type hierarchy mapping</see> for more information and examples.
+ /// </remarks>
  /// <param name="entityTypeBuilder">The builder for the entity type being configured.</param>
  /// <returns>The same builder instance so that multiple calls can be chained.</returns>
  public static EntityTypeBuilder UseTphMappingStrategy(this EntityTypeBuilder entityTypeBuilder)
@@ -45,6 +51,9 @@ public static EntityTypeBuilder UseTphMappingStrategy(this EntityTypeBuilder ent
  /// Configures TPT as the mapping strategy for the derived types. Each type will be mapped to a different database object.
  /// Only the declared properties will be mapped to columns on the corresponding object.
  /// </summary>
+ /// <remarks>
+ /// See <see href="https://aka.ms/efcore-docs-inheritance">Entity type hierarchy mapping</see> for more information and examples.
+ /// </remarks>
  /// <param name="entityTypeBuilder">The builder for the entity type being configured.</param>
  /// <returns>The same builder instance so that multiple calls can be chained.</returns>
  public static EntityTypeBuilder UseTptMappingStrategy(this EntityTypeBuilder entityTypeBuilder)
@@ -58,6 +67,9 @@ public static EntityTypeBuilder UseTptMappingStrategy(this EntityTypeBuilder ent
  /// Configures TPC as the mapping strategy for the derived types. Each type will be mapped to a different database object.
  /// All properties will be mapped to columns on the corresponding object.
  /// </summary>
+ /// <remarks>
+ /// See <see href="https://aka.ms/efcore-docs-inheritance">Entity type hierarchy mapping</see> for more information and examples.
+ /// </remarks>
  /// <param name="entityTypeBuilder">The builder for the entity type being configured.</param>
  /// <returns>The same builder instance so that multiple calls can be chained.</returns>
  public static EntityTypeBuilder<TEntity> UseTpcMappingStrategy<TEntity>(this EntityTypeBuilder<TEntity> entityTypeBuilder)
@@ -68,6 +80,9 @@ public static EntityTypeBuilder<TEntity> UseTpcMappingStrategy<TEntity>(this Ent
  /// Configures TPH as the mapping strategy for the derived types. All types will be mapped to the same database object.
  /// This is the default mapping strategy.
  /// </summary>
+ /// <remarks>
+ /// See <see href="https://aka.ms/efcore-docs-inheritance">Entity type hierarchy mapping</see> for more information and examples.
+ /// </remarks>
  /// <param name="entityTypeBuilder">The builder for the entity type being configured.</param>
  /// <returns>The same builder instance so that multiple calls can be chained.</returns>
  public static EntityTypeBuilder<TEntity> UseTphMappingStrategy<TEntity>(this EntityTypeBuilder<TEntity> entityTypeBuilder)
@@ -78,12 +93,60 @@ public static EntityTypeBuilder<TEntity> UseTphMappingStrategy<TEntity>(this Ent
  /// Configures TPT as the mapping strategy for the derived types. Each type will be mapped to a different database object.
  /// Only the declared properties will be mapped to columns on the corresponding object.
  /// </summary>
+ /// <remarks>
+ /// See <see href="https://aka.ms/efcore-docs-inheritance">Entity type hierarchy mapping</see> for more information and examples.
+ /// </remarks>
  /// <param name="entityTypeBuilder">The builder for the entity type being configured.</param>
  /// <returns>The same builder instance so that multiple calls can be chained.</returns>
  public static EntityTypeBuilder<TEntity> UseTptMappingStrategy<TEntity>(this EntityTypeBuilder<TEntity> entityTypeBuilder)
  where TEntity : class
  => (EntityTypeBuilder<TEntity>)((EntityTypeBuilder)entityTypeBuilder).UseTptMappingStrategy();
 
+ /// <summary>
+ /// Sets the hierarchy mapping strategy.
+ /// </summary>
+ /// <remarks>
+ /// See <see href="https://aka.ms/efcore-docs-inheritance">Entity type hierarchy mapping</see> for more information and examples.
+ /// </remarks>
+ /// <param name="entityTypeBuilder">The builder for the entity type being configured.</param>
+ /// <param name="strategy">The mapping strategy for the derived types.</param>
+ /// <param name="fromDataAnnotation">Indicates whether the configuration was specified using a data annotation.</param>
+ /// <returns>
+ /// The same builder instance if the configuration was applied,
+ /// <see langword="null" /> otherwise.
+ /// </returns>
+ public static IConventionEntityTypeBuilder? UseMappingStrategy(
+ this IConventionEntityTypeBuilder entityTypeBuilder,
+ string? strategy,
+ bool fromDataAnnotation = false)
+ {
+ if (!entityTypeBuilder.CanSetMappingStrategy(strategy, fromDataAnnotation))
+ {
+ return null;
+ }
+
+ entityTypeBuilder.Metadata.SetMappingStrategy(strategy, fromDataAnnotation);
+ return entityTypeBuilder;
+ }
+
+ /// <summary>
+ /// Returns a value indicating whether the hierarchy mapping strategy can be configured
+ /// using the specified configuration source.
+ /// </summary>
+ /// <remarks>
+ /// See <see href="https://aka.ms/efcore-docs-migrations">Database migrations</see> for more information and examples.
+ /// </remarks>
+ /// <param name="entityTypeBuilder">The builder for the entity type being configured.</param>
+ /// <param name="strategy">The mapping strategy for the derived types.</param>
+ /// <param name="fromDataAnnotation">Indicates whether the configuration was specified using a data annotation.</param>
+ /// <returns><see langword="true" /> if the configuration can be applied.</returns>
+ public static bool CanSetMappingStrategy(
+ this IConventionEntityTypeBuilder entityTypeBuilder,
+ string? strategy,
+ bool fromDataAnnotation = false)
+ => entityTypeBuilder.CanSetAnnotation
+ (RelationalAnnotationNames.MappingStrategy, strategy, fromDataAnnotation);
+
  /// <summary>
  /// Mark the table that this entity type is mapped to as excluded from migrations.
  /// </summary>

src/EFCore.Relational/Extensions/RelationalPropertyExtensions.cs

@@ -1451,7 +1451,7 @@ public static IEnumerable<IReadOnlyRelationalPropertyOverrides> GetOverrides(thi
  /// <param name="property">The property.</param>
  /// <returns>The property facet overrides.</returns>
  public static IEnumerable<IMutableRelationalPropertyOverrides> GetOverrides(this IMutableProperty property)
- => ((IEnumerable<IMutableRelationalPropertyOverrides>?)RelationalPropertyOverrides.Get(property))
+ => RelationalPropertyOverrides.Get(property)?.Cast<IMutableRelationalPropertyOverrides>()
  ?? Enumerable.Empty<IMutableRelationalPropertyOverrides>();
 
  /// <summary>
@@ -1466,7 +1466,7 @@ public static IEnumerable<IMutableRelationalPropertyOverrides> GetOverrides(this
  /// <param name="property">The property.</param>
  /// <returns>The property facet overrides.</returns>
  public static IEnumerable<IConventionRelationalPropertyOverrides> GetOverrides(this IConventionProperty property)
- => ((IEnumerable<IConventionRelationalPropertyOverrides>?)RelationalPropertyOverrides.Get(property))
+ => RelationalPropertyOverrides.Get(property)?.Cast<IConventionRelationalPropertyOverrides>()
  ?? Enumerable.Empty<IConventionRelationalPropertyOverrides>();
 
  /// <summary>
@@ -1481,7 +1481,7 @@ public static IEnumerable<IConventionRelationalPropertyOverrides> GetOverrides(t
  /// <param name="property">The property.</param>
  /// <returns>The property facet overrides.</returns>
  public static IEnumerable<IRelationalPropertyOverrides> GetOverrides(this IProperty property)
- => ((IEnumerable<IRelationalPropertyOverrides>?)RelationalPropertyOverrides.Get(property))
+ => RelationalPropertyOverrides.Get(property)?.Cast<IRelationalPropertyOverrides>()
  ?? Enumerable.Empty<IRelationalPropertyOverrides>();
 
  /// <summary>

src/EFCore.Relational/Metadata/Conventions/EntityTypeHierarchyMappingConvention.cs

@@ -40,6 +40,7 @@ public virtual void ProcessModelFinalizing(
  IConventionModelBuilder modelBuilder,
  IConventionContext<IConventionModelBuilder> context)
  {
+ var allRoots = new HashSet<IConventionEntityType>();
  var nonTphRoots = new HashSet<IConventionEntityType>();
 
  foreach (var entityType in modelBuilder.Metadata.GetEntityTypes())
@@ -49,15 +50,24 @@ public virtual void ProcessModelFinalizing(
  continue;
  }
 
+ var root = entityType.GetRootType();
+ allRoots.Add(root);
  var mappingStrategy = (string?)entityType[RelationalAnnotationNames.MappingStrategy];
  if (mappingStrategy == null)
  {
- mappingStrategy = (string?)entityType.GetRootType()[RelationalAnnotationNames.MappingStrategy];
+ mappingStrategy = (string?)root[RelationalAnnotationNames.MappingStrategy];
+ if (mappingStrategy == null
+ && root.GetDiscriminatorPropertyConfigurationSource() == ConfigurationSource.Explicit)
+ {
+ mappingStrategy = RelationalAnnotationNames.TphMappingStrategy;
+ root.Builder.UseMappingStrategy(RelationalAnnotationNames.TphMappingStrategy);
+ continue;
+ }
  }
 
  if (mappingStrategy == RelationalAnnotationNames.TpcMappingStrategy)
  {
- nonTphRoots.Add(entityType.GetRootType());
+ nonTphRoots.Add(root);
  continue;
  }
 
@@ -70,6 +80,7 @@ public virtual void ProcessModelFinalizing(
  || entityType.GetSchema() != entityType.BaseType.GetSchema())
  {
  mappingStrategy = RelationalAnnotationNames.TptMappingStrategy;
+ root.Builder.UseMappingStrategy(mappingStrategy);
  }
  }
 
@@ -96,7 +107,7 @@ public virtual void ProcessModelFinalizing(
  }
  }
 
- nonTphRoots.Add(entityType.GetRootType());
+ nonTphRoots.Add(root);
  continue;
  }
  }
@@ -106,13 +117,20 @@ public virtual void ProcessModelFinalizing(
  && (viewName != entityType.BaseType.GetViewName()
  || entityType.GetViewSchema() != entityType.BaseType.GetViewSchema()))
  {
- nonTphRoots.Add(entityType.GetRootType());
+ nonTphRoots.Add(root);
+ continue;
  }
  }
 
  foreach (var root in nonTphRoots)
  {
+ allRoots.Remove(root);
  root.Builder.HasNoDiscriminator();
  }
+
+ foreach (var root in allRoots)
+ {
+ root.Builder.UseMappingStrategy(RelationalAnnotationNames.TphMappingStrategy);
+ }
  }
 }

src/EFCore.Relational/Metadata/Conventions/Infrastructure/RelationalConventionSetBuilder.cs

@@ -83,6 +83,8 @@ public override ConventionSet CreateConventionSet()
  conventionSet.EntityTypeBaseTypeChangedConventions.Add(checkConstraintConvention);
  conventionSet.EntityTypeBaseTypeChangedConventions.Add(triggerConvention);
 
+ conventionSet.EntityTypeAnnotationChangedConventions.Add(tableNameFromDbSetConvention);
+
  ReplaceConvention(conventionSet.ForeignKeyPropertiesChangedConventions, valueGenerationConvention);
 
  ReplaceConvention(conventionSet.ForeignKeyOwnershipChangedConventions, valueGenerationConvention);

src/EFCore.Relational/Metadata/Conventions/TableNameFromDbSetConvention.cs

@@ -12,6 +12,7 @@ namespace Microsoft.EntityFrameworkCore.Metadata.Conventions;
 public class TableNameFromDbSetConvention :
  IEntityTypeAddedConvention,
  IEntityTypeBaseTypeChangedConvention,
+ IEntityTypeAnnotationChangedConvention,
  IModelFinalizingConvention
 {
  private readonly IDictionary<Type, string> _sets;
@@ -63,13 +64,7 @@ public TableNameFromDbSetConvention(
  /// </summary>
  protected virtual RelationalConventionSetBuilderDependencies RelationalDependencies { get; }
 
- /// <summary>
- /// Called after the base type of an entity type changes.
- /// </summary>
- /// <param name="entityTypeBuilder">The builder for the entity type.</param>
- /// <param name="newBaseType">The new base entity type.</param>
- /// <param name="oldBaseType">The old base entity type.</param>
- /// <param name="context">Additional information associated with convention execution.</param>
+ /// <inheritdoc />
  public virtual void ProcessEntityTypeBaseTypeChanged(
  IConventionEntityTypeBuilder entityTypeBuilder,
  IConventionEntityType? newBaseType,
@@ -79,7 +74,9 @@ public virtual void ProcessEntityTypeBaseTypeChanged(
  var entityType = entityTypeBuilder.Metadata;
 
  if (oldBaseType == null
- && newBaseType != null)
+ && newBaseType != null
+ && (entityType.GetMappingStrategy() ?? RelationalAnnotationNames.TphMappingStrategy)
+ == RelationalAnnotationNames.TphMappingStrategy)
  {
  entityTypeBuilder.HasNoAnnotation(RelationalAnnotationNames.TableName);
  }
@@ -92,24 +89,46 @@ public virtual void ProcessEntityTypeBaseTypeChanged(
  }
  }
 
- /// <summary>
- /// Called after an entity type is added to the model.
- /// </summary>
- /// <param name="entityTypeBuilder">The builder for the entity type.</param>
- /// <param name="context">Additional information associated with convention execution.</param>
+ /// <inheritdoc />
  public virtual void ProcessEntityTypeAdded(
  IConventionEntityTypeBuilder entityTypeBuilder,
  IConventionContext<IConventionEntityTypeBuilder> context)
  {
  var entityType = entityTypeBuilder.Metadata;
- if (entityType.BaseType == null
- && !entityType.HasSharedClrType
+ if (!entityType.HasSharedClrType
+ && (entityType.BaseType == null
+ || (entityType.GetMappingStrategy() ?? RelationalAnnotationNames.TphMappingStrategy)
+ != RelationalAnnotationNames.TphMappingStrategy)
  && _sets.TryGetValue(entityType.ClrType, out var setName))
  {
  entityTypeBuilder.ToTable(setName);
  }
  }
 
+ /// <inheritdoc />
+ public virtual void ProcessEntityTypeAnnotationChanged(
+ IConventionEntityTypeBuilder entityTypeBuilder,
+ string name,
+ IConventionAnnotation? annotation,
+ IConventionAnnotation? oldAnnotation,
+ IConventionContext<IConventionAnnotation> context)
+ {
+ if (name == RelationalAnnotationNames.MappingStrategy
+ && annotation != null
+ && (entityTypeBuilder.Metadata.GetMappingStrategy() ?? RelationalAnnotationNames.TphMappingStrategy)
+ != RelationalAnnotationNames.TphMappingStrategy)
+ {
+ foreach (var deriverEntityType in entityTypeBuilder.Metadata.GetDerivedTypesInclusive())
+ {
+ if (!deriverEntityType.HasSharedClrType
+ && _sets.TryGetValue(deriverEntityType.ClrType, out var setName))
+ {
+ deriverEntityType.Builder.ToTable(setName);
+ }
+ }
+ }
+ }
+
  /// <inheritdoc />
  public virtual void ProcessModelFinalizing(
  IConventionModelBuilder modelBuilder,

test/EFCore.Design.Tests/Migrations/Design/CSharpMigrationsGeneratorTest.cs

@@ -18,6 +18,7 @@ public class CSharpMigrationsGeneratorTest
 {
  private static readonly string _nl = Environment.NewLine;
  private static readonly string _toTable = _nl + @"entityTypeBuilder.ToTable(""WithAnnotations"")";
+ private static readonly string _toNullTable = _nl + @"entityTypeBuilder.ToTable((string)null)";
 
  [ConditionalFact]
  public void Test_new_annotations_handled_for_entity_types()
@@ -139,19 +140,22 @@ public void Test_new_annotations_handled_for_entity_types()
 #pragma warning disable CS0612 // Type or member is obsolete
  CoreAnnotationNames.DefiningQuery,
 #pragma warning restore CS0612 // Type or member is obsolete
- (Expression.Lambda(Expression.Constant(null)), "")
+ (Expression.Lambda(Expression.Constant(null)), _toNullTable)
  },
  {
  RelationalAnnotationNames.ViewName,
- ("MyView", _nl + "entityTypeBuilder." + nameof(RelationalEntityTypeBuilderExtensions.ToView) + @"(""MyView"")")
+ ("MyView", _toNullTable + ";" + _nl + _nl
+ + "entityTypeBuilder." + nameof(RelationalEntityTypeBuilderExtensions.ToView) + @"(""MyView"")")
  },
  {
  RelationalAnnotationNames.FunctionName,
- (null, _nl + "entityTypeBuilder." + nameof(RelationalEntityTypeBuilderExtensions.ToFunction) + @"(null)")
+ (null, _toNullTable + ";" + _nl + _nl
+ + "entityTypeBuilder." + nameof(RelationalEntityTypeBuilderExtensions.ToFunction) + @"(null)")
  },
  {
  RelationalAnnotationNames.SqlQuery,
- (null, _nl + "entityTypeBuilder." + nameof(RelationalEntityTypeBuilderExtensions.ToSqlQuery) + @"(null)")
+ (null, _toNullTable + ";" + _nl + _nl
+ + "entityTypeBuilder." + nameof(RelationalEntityTypeBuilderExtensions.ToSqlQuery) + @"(null)")
  }
  };