Add tests for Neo4j

Also mention Neo4j as compatible with the reactive stack
and the QuerydslPredicateExecutor.

See gh-734

Author: meistermeier

spring-graphql-docs/src/docs/asciidoc/includes/data.adoc

@@ -50,14 +50,14 @@ You can now register the above `DataFetcher` through a
 <<execution.graphqlsource.runtimewiring-configurer>>.
 
 The `DataFetcher` builds a Querydsl `Predicate` from GraphQL arguments, and uses it to
-fetch data. Spring Data supports `QuerydslPredicateExecutor` for JPA, MongoDB, and LDAP.
+fetch data. Spring Data supports `QuerydslPredicateExecutor` for JPA, MongoDB, Neo4j, and LDAP.
 
 NOTE: For a single argument that is a GraphQL input type, `QuerydslDataFetcher` nests one
 level down, and uses the values from the argument sub-map.
 
 If the repository is `ReactiveQuerydslPredicateExecutor`, the builder returns
 `DataFetcher<Mono<Account>>` or `DataFetcher<Flux<Account>>`. Spring Data supports this
-variant for MongoDB.
+variant for MongoDB and Neo4j.
 
 
 [[data.querydsl.build]]

spring-graphql/build.gradle

@@ -51,9 +51,11 @@ dependencies {
 	testImplementation 'org.hibernate:hibernate-core'
 	testImplementation 'org.hibernate.validator:hibernate-validator'
 	testImplementation 'org.springframework.data:spring-data-mongodb'
+	testImplementation 'org.springframework.data:spring-data-neo4j:7.1.1'
 	testImplementation 'org.mongodb:mongodb-driver-sync'
 	testImplementation 'org.mongodb:mongodb-driver-reactivestreams'
 	testImplementation 'org.testcontainers:mongodb'
+	testImplementation 'org.testcontainers:neo4j'
 	testImplementation 'org.testcontainers:junit-jupiter'
 	testImplementation 'org.springframework.security:spring-security-core'
 	testImplementation 'com.querydsl:querydsl-core'

spring-graphql/src/test/java/org/springframework/graphql/data/query/neo4j/Author.java

@@ -0,0 +1,57 @@
+package org.springframework.graphql.data.query.neo4j;
+
+import org.springframework.data.neo4j.core.schema.Id;
+import org.springframework.data.neo4j.core.schema.Node;
+
+/**
+ * @author Gerrit Meier
+ */
+@Node
+public class Author {
+
+	@Id
+	String id;
+
+	String firstName;
+
+	String lastName;
+
+	// needed for response mapping
+	public Author() {
+
+	}
+
+	public Author(String id, String firstName, String lastName) {
+		this.id = id;
+		this.firstName = firstName;
+		this.lastName = lastName;
+	}
+
+	public String getId() {
+		return this.id;
+	}
+
+	public void setId(String id) {
+		this.id = id;
+	}
+
+	public String getFirstName() {
+		return this.firstName;
+	}
+
+	public void setFirstName(String firstName) {
+		this.firstName = firstName;
+	}
+
+	public String getLastName() {
+		return this.lastName;
+	}
+
+	public void setLastName(String lastName) {
+		this.lastName = lastName;
+	}
+
+	public String getFullName() {
+		return this.firstName + " " + this.lastName;
+	}
+}

spring-graphql/src/test/java/org/springframework/graphql/data/query/neo4j/Book.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright 2020-2021 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.graphql.data.query.neo4j;
+
+import org.springframework.data.neo4j.core.schema.Id;
+import org.springframework.data.neo4j.core.schema.Node;
+import org.springframework.data.neo4j.core.schema.Relationship;
+
+@Node
+public class Book {
+
+	@Id
+	String id;
+
+	String name;
+
+	@Relationship("AUTHOR")
+	Author author;
+
+	// needed for response mapping
+	public Book() {
+
+	}
+
+	public Book(String id, String name, Author author) {
+		this.id = id;
+		this.name = name;
+		this.author = author;
+	}
+
+	public String getId() {
+		return this.id;
+	}
+
+	public void setId(String id) {
+		this.id = id;
+	}
+
+	public String getName() {
+		return this.name;
+	}
+
+	public void setName(String name) {
+		this.name = name;
+	}
+
+	public Author getAuthor() {
+		return this.author;
+	}
+
+	public void setAuthor(Author author) {
+		this.author = author;
+	}
+
+}

spring-graphql/src/test/java/org/springframework/graphql/data/query/neo4j/BookNeo4jRepository.java

@@ -0,0 +1,11 @@
+package org.springframework.graphql.data.query.neo4j;
+
+import org.springframework.data.neo4j.repository.Neo4jRepository;
+import org.springframework.graphql.data.GraphQlRepository;
+
+/**
+ * @author Gerrit Meier
+ */
+@GraphQlRepository
+public interface BookNeo4jRepository extends Neo4jRepository<Book, String> {
+}

spring-graphql/src/test/java/org/springframework/graphql/data/query/neo4j/BookReactiveNeo4jRepository.java

@@ -0,0 +1,11 @@
+package org.springframework.graphql.data.query.neo4j;
+
+import org.springframework.data.neo4j.repository.ReactiveNeo4jRepository;
+import org.springframework.graphql.data.GraphQlRepository;
+
+/**
+ * @author Gerrit Meier
+ */
+@GraphQlRepository
+public interface BookReactiveNeo4jRepository extends ReactiveNeo4jRepository<Book, String> {
+}