Many to many colors use case

jdbc/basics/src/main/java/example/springdata/jdbc/basics/aggregate/Color.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2017-2018 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
+ *
+ *      http://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 example.springdata.jdbc.basics.aggregate;
+
+import lombok.Builder;
+import lombok.Data;
+import org.springframework.data.annotation.Id;
+import org.springframework.data.relational.core.mapping.Column;
+import org.springframework.data.relational.core.mapping.Table;
+
+@Data
+@Builder
+public class Color {
+
+	private @Id Long id;
+	private String name;
+
+}

jdbc/basics/src/main/java/example/springdata/jdbc/basics/aggregate/ColorRef.java

@@ -0,0 +1,10 @@
+package example.springdata.jdbc.basics.aggregate;
+
+import lombok.Builder;
+import org.springframework.data.relational.core.mapping.Table;
+
+@Table("lego_set_color")
+@Builder
+public class ColorRef {
+	Long colorId;
+}

jdbc/basics/src/main/java/example/springdata/jdbc/basics/aggregate/ColorRepository.java

@@ -0,0 +1,22 @@
+/*
+ * Copyright 2017-2018 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
+ *
+ *      http://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 example.springdata.jdbc.basics.aggregate;
+
+import org.springframework.data.repository.CrudRepository;
+
+interface ColorRepository extends CrudRepository<Color, Integer> {
+
+}

jdbc/basics/src/main/java/example/springdata/jdbc/basics/aggregate/LegoSet.java

@@ -23,7 +23,9 @@
 import java.time.Period;
 import java.time.temporal.ChronoUnit;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.Map;
+import java.util.Set;
 
 import org.springframework.data.annotation.AccessType;
 import org.springframework.data.annotation.AccessType.Type;
@@ -44,6 +46,8 @@ public class LegoSet {
 	private @Id int id;
 	private String name;
 	private @Transient Period minimumAge, maximumAge;
+	@Column(keyColumn = "lego_set_id")
+	private Set<ColorRef> colors = new HashSet<>();
 
 	/**
 	 * Since Manuals are part of a {@link LegoSet} and only make sense inside a {@link LegoSet} it is considered part of
@@ -93,4 +97,8 @@ public void addModel(String name, String description) {
 		Model model = new Model(name, description);
 		models.put(name, model);
 	}
+
+	public void addColor(Color color) {
+		colors.add(ColorRef.builder().colorId(color.getId()).build());
+	}
 }

jdbc/basics/src/main/resources/schema.sql

@@ -3,3 +3,8 @@ CREATE TABLE IF NOT EXISTS category (id INTEGER IDENTITY PRIMARY KEY, name VARCH
 CREATE TABLE IF NOT EXISTS Lego_Set (id INTEGER, name VARCHAR(100), min_Age INTEGER, max_Age INTEGER);
 CREATE TABLE IF NOT EXISTS Handbuch (handbuch_id INTEGER, author CHAR(100), text CLOB);
 CREATE TABLE IF NOT EXISTS Model (name VARCHAR(100), description CLOB, lego_set INTEGER);
+
+CREATE TABLE IF NOT EXISTS color (id INTEGER IDENTITY PRIMARY KEY, name VARCHAR(100));
+CREATE TABLE IF NOT EXISTS lego_set_color (lego_set_id INTEGER, color_id INTEGER);
+
+

jdbc/basics/src/test/java/example/springdata/jdbc/basics/aggregate/AggregateTests.java

@@ -44,34 +44,43 @@
 public class AggregateTests {
 
 	@Autowired LegoSetRepository repository;
+	@Autowired ColorRepository colorRepo;
 
 	@Test
 	public void exerciseSomewhatComplexEntity() {
 
+		Color blue = Color.builder().name("blue").build();
+		Color red = Color.builder().name("red").build();
+
+		colorRepo.save(blue);
+		colorRepo.save(red);
+
 		LegoSet smallCar = createLegoSet("Small Car 01", 5, 12);
 		smallCar.setManual(new Manual("Just put all the pieces together in the right order", "Jens Schauder"));
 		smallCar.addModel("suv", "SUV with sliding doors.");
 		smallCar.addModel("roadster", "Slick red roadster.");
+		smallCar.addColor(blue);
+		smallCar.addColor(red);
 
 		repository.save(smallCar);
 		Iterable<LegoSet> legoSets = repository.findAll();
 		Output.list(legoSets, "Original LegoSet");
-		checkLegoSets(legoSets, "Just put all the pieces together in the right order", 2);
+		checkLegoSets(legoSets, "Just put all the pieces together in the right order", 2, 2);
 
 		smallCar.getManual().setText("Just make it so it looks like a car.");
 		smallCar.addModel("pickup", "A pickup truck with some tools in the back.");
 
 		repository.save(smallCar);
 		legoSets = repository.findAll();
 		Output.list(legoSets, "Updated");
-		checkLegoSets(legoSets, "Just make it so it looks like a car.", 3);
+		checkLegoSets(legoSets, "Just make it so it looks like a car.", 3, 2);
 
 		smallCar.setManual(new Manual("One last attempt: Just build a car! Ok?", "Jens Schauder"));
 
 		repository.save(smallCar);
 		legoSets = repository.findAll();
 		Output.list(legoSets, "Manual replaced");
-		checkLegoSets(legoSets, "One last attempt: Just build a car! Ok?", 3);
+		checkLegoSets(legoSets, "One last attempt: Just build a car! Ok?", 3, 2);
 
 	}
 
@@ -124,12 +133,14 @@ private LegoSet createLegoSet(String name, int minimumAge, int maximumAge) {
 		return smallCar;
 	}
 
-	private void checkLegoSets(Iterable<LegoSet> legoSets, String manualText, int numberOfModels) {
+	private void checkLegoSets(Iterable<LegoSet> legoSets, String manualText, int numberOfModels, int numberOfColors) {
 
 		assertThat(legoSets) //
 				.extracting( //
 						ls -> ls.getManual().getText(), //
-						ls -> ls.getModels().size()) //
-				.containsExactly(new Tuple(manualText, numberOfModels));
+						ls -> ls.getModels().size(),
+						ls -> ls.getColors().size()
+				) //
+				.containsExactly(new Tuple(manualText, numberOfModels, numberOfColors));
 	}
 }