fix: Double check for a collection to be present in the mapping without directional prefix.

This is a direct follow up on #2918, in which we added the suffix to the collection names. That change didn’t take custom queries into account and people are most likely still using the known pattern of `source_REL_target` and I would like to not break them.
Therefor, we check now in the values list if a collection without suffix exists if we didn’t find one with and if so, use that.

This fixes #2963.

src/main/java/org/springframework/data/neo4j/core/mapping/DefaultNeo4jEntityConverter.java

@@ -675,6 +675,11 @@ final class DefaultNeo4jEntityConverter implements Neo4jEntityConverter {
 		String collectionName = relationshipDescription.generateRelatedNodesCollectionName(baseDescription);
 		Value list = values.get(collectionName);
 		boolean relationshipListEmptyOrNull = Values.NULL.equals(list);
+		if (relationshipListEmptyOrNull) {
+			collectionName = collectionName.replaceFirst("_" + relationshipDescription.isOutgoing() + "\\z", "");
+		}
+		list = values.get(collectionName);
+		relationshipListEmptyOrNull = Values.NULL.equals(list);
 
 		List<Object> relationshipsAndProperties = new ArrayList<>();
 

src/test/java/org/springframework/data/neo4j/integration/issues/IssuesIT.java

@@ -187,6 +187,8 @@ import org.springframework.data.neo4j.integration.issues.gh2908.LocatedNodeWithS
 import org.springframework.data.neo4j.integration.issues.gh2908.Place;
 import org.springframework.data.neo4j.integration.issues.gh2918.ConditionNode;
 import org.springframework.data.neo4j.integration.issues.gh2918.ConditionRepository;
+import org.springframework.data.neo4j.integration.issues.gh2963.MyModel;
+import org.springframework.data.neo4j.integration.issues.gh2963.MyRepository;
 import org.springframework.data.neo4j.integration.issues.qbe.A;
 import org.springframework.data.neo4j.integration.issues.qbe.ARepository;
 import org.springframework.data.neo4j.integration.issues.qbe.B;
@@ -1677,6 +1679,25 @@ class IssuesIT extends TestBase {
 		}
 	}
 
+	@Tag("GH-2963")
+	@Test
+	void customQueriesShouldKeepWorkingWithoutSpecifyingTheRelDirectionInTheirQueries(@Autowired MyRepository myRepository) {
+		// set up data in database
+		MyModel myNestedModel = new MyModel();
+		myNestedModel.setName("nested");
+
+		MyModel myRootModel = new MyModel();
+		myRootModel.setName("root");
+		myRootModel.setMyNestedModel(myNestedModel);
+
+		String uuid = myRepository.save(myRootModel).getUuid();
+		Optional<MyModel> rootModelFromDbCustom = myRepository.getByUuidCustomQuery(uuid);
+		assertThat(rootModelFromDbCustom).map(MyModel::getMyNestedModel).isPresent();
+
+		rootModelFromDbCustom = myRepository.getByUuidCustomQueryV2(uuid);
+		assertThat(rootModelFromDbCustom).map(MyModel::getMyNestedModel).isPresent();
+	}
+
 	@Configuration
 	@EnableTransactionManagement
 	@EnableNeo4jRepositories(namedQueriesLocation = "more-custom-queries.properties")

src/test/java/org/springframework/data/neo4j/integration/issues/gh2963/MyModel.java

@@ -0,0 +1,62 @@
+/*
+ * Copyright 2011-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.data.neo4j.integration.issues.gh2963;
+
+import org.springframework.data.neo4j.core.schema.GeneratedValue;
+import org.springframework.data.neo4j.core.schema.Id;
+import org.springframework.data.neo4j.core.schema.Node;
+import org.springframework.data.neo4j.core.schema.Relationship;
+import org.springframework.data.neo4j.core.support.UUIDStringGenerator;
+
+/**
+ * @author Andreas Rümpel
+ * @author Michael J. Simons
+ */
+@Node
+public class MyModel {
+	@Id
+	@GeneratedValue(generatorClass = UUIDStringGenerator.class)
+	private String uuid;
+
+	private String name;
+
+	@Relationship(value = "REL_TO_MY_NESTED_MODEL")
+	private MyModel myNestedModel;
+
+	public MyModel getMyNestedModel() {
+		return myNestedModel;
+	}
+
+	public void setMyNestedModel(MyModel myNestedModel) {
+		this.myNestedModel = myNestedModel;
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public void setName(String name) {
+		this.name = name;
+	}
+
+	public String getUuid() {
+		return uuid;
+	}
+
+	public void setUuid(String uuid) {
+		this.uuid = uuid;
+	}
+}

src/test/java/org/springframework/data/neo4j/integration/issues/gh2963/MyRepository.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2011-2024 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.data.neo4j.integration.issues.gh2963;
+
+import java.util.Optional;
+
+import org.springframework.data.neo4j.repository.query.Query;
+import org.springframework.data.repository.CrudRepository;
+
+/**
+ * @author Andreas Rümpel
+ * @author Michael J. Simons
+ */
+public interface MyRepository extends CrudRepository<MyModel, String> {
+
+    @Query("""
+            MATCH (root:MyModel {uuid: $uuid})
+            RETURN root {
+                     .*, MyModel_REL_TO_MY_NESTED_MODEL_MyModel: [
+                       (root)-[:REL_TO_MY_NESTED_MODEL]->(nested:MyModel) | nested {. *}
+                     ]
+                   }
+            """)
+    Optional<MyModel> getByUuidCustomQuery(String uuid);
+
+	@Query("""
+            MATCH (root:MyModel {uuid: $uuid})
+            RETURN root {
+                     .*, MyModel_REL_TO_MY_NESTED_MODEL_MyModel_true: [
+                       (root)-[:REL_TO_MY_NESTED_MODEL]->(nested:MyModel) | nested {. *}
+                     ]
+                   }
+            """)
+	Optional<MyModel> getByUuidCustomQueryV2(String uuid);
+}