HHH-19963 Only consider a ToOne be bidirectional for OneToMany if FKs are equal

hibernate-core/src/main/java/org/hibernate/metamodel/mapping/internal/PluralAttributeMappingImpl.java

@@ -32,6 +32,7 @@
 import org.hibernate.metamodel.mapping.SelectableMapping;
 import org.hibernate.metamodel.mapping.SoftDeleteMapping;
 import org.hibernate.metamodel.mapping.TableDetails;
+import org.hibernate.metamodel.mapping.ValuedModelPart;
 import org.hibernate.metamodel.mapping.ordering.OrderByFragment;
 import org.hibernate.metamodel.mapping.ordering.OrderByFragmentTranslator;
 import org.hibernate.metamodel.mapping.ordering.TranslationContext;
@@ -225,11 +226,31 @@ private static void injectAttributeMapping(
 	@Override
 	public boolean isBidirectionalAttributeName(NavigablePath fetchablePath, ToOneAttributeMapping modelPart) {
 		return bidirectionalAttributeName == null
-				// If the FK-target of the to-one mapping is the same as the FK-target of this plural mapping,
-				// then we say this is bidirectional, given that this is only invoked for model parts of the
-				// collection elements
-				? fkDescriptor.getTargetPart() == modelPart.getForeignKeyDescriptor().getTargetPart()
-				: fetchablePath.getLocalName().endsWith( bidirectionalAttributeName );
+				// If the FK-target of the to-one mapping is the same as the FK-target of this one-to-many mapping,
+				// and the FK-key refer to the same column then we say this is bidirectional,
+				// given that this is only invoked for model parts of the collection elements
+				? modelPart.getSideNature() == ForeignKeyDescriptor.Nature.KEY
+				&& collectionDescriptor.isOneToMany()
+				&& fkDescriptor.getTargetPart() == modelPart.getForeignKeyDescriptor().getTargetPart()
+				&& areEqual( fkDescriptor.getKeyPart(), modelPart.getForeignKeyDescriptor().getKeyPart() )
+				: fetchablePath.getLocalName().equals( bidirectionalAttributeName );
+	}
+
+	private boolean areEqual(ValuedModelPart part1, ValuedModelPart part2) {
+		final int typeCount = part1.getJdbcTypeCount();
+		if ( part2.getJdbcTypeCount() != typeCount ) {
+			return false;
+		}
+		for ( int i = 0; i < typeCount; i++ ) {
+			final SelectableMapping selectable1 = part1.getSelectable( i );
+			final SelectableMapping selectable2 = part2.getSelectable( i );
+			if ( selectable1.getJdbcMapping() != selectable2.getJdbcMapping()
+				|| !selectable1.getContainingTableExpression().equals( selectable2.getContainingTableExpression() )
+				|| !selectable1.getSelectionExpression().equals( selectable2.getSelectionExpression() ) ) {
+				return false;
+			}
+		}
+		return true;
 	}
 
 	public void finishInitialization(

hibernate-core/src/test/java/org/hibernate/orm/test/mapping/collections/BidirectionalOneToManyTest.java

@@ -0,0 +1,122 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ * Copyright Red Hat Inc. and Hibernate Authors
+ */
+package org.hibernate.orm.test.mapping.collections;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.JoinTable;
+import jakarta.persistence.ManyToMany;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.Table;
+import org.hibernate.testing.orm.junit.EntityManagerFactoryScope;
+import org.hibernate.testing.orm.junit.Jira;
+import org.hibernate.testing.orm.junit.Jpa;
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+@Jpa( annotatedClasses = {BidirectionalOneToManyTest.Organization.class, BidirectionalOneToManyTest.User.class} )
+@Jira("https://hibernate.atlassian.net/browse/HHH-19963")
+public class BidirectionalOneToManyTest {
+
+	@Test
+	public void testParentNotTreatedAsBidirectional(EntityManagerFactoryScope scope) {
+		scope.inTransaction( entityManager -> {
+			Organization o3 = new Organization( 3L, "o3", null, new ArrayList<>() );
+			Organization o1 = new Organization( 1L, "o1", null, new ArrayList<>( Arrays.asList( o3 )) );
+			Organization o2 = new Organization( 2L, "o2", o1, new ArrayList<>() );
+			entityManager.persist(o3);
+			entityManager.persist(o1);
+			entityManager.persist(o2);
+
+			User u1 = new User( 1L, o2 );
+			User u2 = new User( 2L, o2 );
+			entityManager.persist(u1);
+			entityManager.persist(u2);
+		});
+
+		scope.inTransaction( entityManager -> {
+			User user1 = entityManager.find(User.class, 1L);
+			Organization ou3 = entityManager.find(Organization.class, 3L);
+			assertNull( ou3.getParentOrganization(), "Parent of o3 is null");
+			assertEquals(0, ou3.getPredecessorOrganizations().size(), "Predecessors of o3 is empty");
+		});
+	}
+
+	@Entity(name = "Organization")
+	public static class Organization {
+
+		@Id
+		private Long id;
+		private String name;
+
+		@ManyToOne(fetch = FetchType.EAGER)
+		@JoinColumn(name = "parentorganization_objectId")
+		private Organization parentOrganization;
+
+		@ManyToMany(fetch = FetchType.EAGER)
+		@JoinTable(name = "organization_predecessor")
+		private List<Organization> predecessorOrganizations = new ArrayList<>();
+
+		public Organization() {
+		}
+
+		public Organization(Long id, String name, Organization parentOrganization, List<Organization> predecessorOrganizations) {
+			this.id = id;
+			this.name = name;
+			this.parentOrganization = parentOrganization;
+			this.predecessorOrganizations = predecessorOrganizations;
+		}
+
+		public Long getId() {
+			return id;
+		}
+
+		public String getName() {
+			return name;
+		}
+
+		public Organization getParentOrganization() {
+			return parentOrganization;
+		}
+
+		public List<Organization> getPredecessorOrganizations() {
+			return predecessorOrganizations;
+		}
+	}
+
+	@Entity(name = "User")
+	@Table(name = "usr_tbl")
+	public static class User {
+
+		@Id
+		private Long id;
+		@ManyToOne(fetch = FetchType.EAGER)
+		private Organization organization;
+
+		public User() {
+		}
+
+		public User(Long id, Organization organization) {
+			this.id = id;
+			this.organization = organization;
+		}
+
+		public Long getId() {
+			return id;
+		}
+
+		public Organization getOrganization() {
+			return organization;
+		}
+	}
+}