UpdateDefinition.inc(…) now returns this.

Align with other update methods returning the update definition.

Closes #5045

Author: mp911de

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/MappedDocument.java

@@ -135,8 +135,9 @@ public boolean modifies(String key) {
 		}
 
 		@Override
-		public void inc(String version) {
+		public UpdateDefinition inc(String version) {
 			delegate.inc(version);
+			return this;
 		}
 
 		@Override

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/aggregation/AggregationUpdate.java

@@ -263,8 +263,10 @@ public boolean modifies(String key) {
 	}
 
 	@Override
-	public void inc(String key) {
+	public UpdateDefinition inc(String key) {
+
 		set(new SetOperation(key, ArithmeticOperators.valueOf(key).add(1)));
+		return this;
 	}
 
 	@Override

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/query/Update.java

@@ -150,7 +150,7 @@ public Update unset(String key) {
 	}
 
 	/**
-	 * Update using the {@literal $inc} update modifier
+	 * Update using the {@literal $inc} update modifier.
 	 *
 	 * @param key the field name.
 	 * @param inc must not be {@literal null}.
@@ -163,14 +163,21 @@ public Update inc(String key, Number inc) {
 		return this;
 	}
 
+	/**
+	 * Update using the {@literal $inc} update modifier by one.
+	 *
+	 * @param key the field name.
+	 * @return this.
+	 * @see <a href="https://docs.mongodb.org/manual/reference/operator/update/inc/">MongoDB Update operator: $inc</a>
+	 */
 	@Override
 	@Contract("_ -> this")
-	public void inc(String key) {
-		inc(key, 1L);
+	public Update inc(String key) {
+		return inc(key, 1L);
 	}
 
 	/**
-	 * Update using the {@literal $push} update modifier
+	 * Update using the {@literal $push} update modifier.
 	 *
 	 * @param key the field name.
 	 * @param value can be {@literal null}.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/query/UpdateDefinition.java

@@ -54,8 +54,9 @@ public interface UpdateDefinition {
 	 * Increment the value of a given {@literal key} by {@code 1}.
 	 *
 	 * @param key must not be {@literal null}.
+	 * @return {@code this} update definition.
 	 */
-	void inc(String key);
+	UpdateDefinition inc(String key);
 
 	/**
 	 * Get the specification which elements to modify in an array field. {@link ArrayFilter} are passed directly to the

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/messaging/ChangeStreamTests.java

@@ -38,8 +38,8 @@
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
-
 import org.junitpioneer.jupiter.RetryingTest;
+
 import org.springframework.data.annotation.Id;
 import org.springframework.data.mongodb.core.ChangeStreamOptions;
 import org.springframework.data.mongodb.core.CollectionOptions;
@@ -522,7 +522,7 @@ void filterOnUpdateDescriptionElement() throws InterruptedException {
 		template.update(User.class).matching(query(where("id").is(jellyBelly.id)))
 				.apply(Update.update("address", new Address("candy ave"))).first();
 
-		template.update(User.class).matching(query(where("id").is(sugarSplashy.id))).apply(new Update().inc("age", 1))
+		template.update(User.class).matching(query(where("id").is(sugarSplashy.id))).apply(new Update().inc("age"))
 				.first();
 
 		template.update(User.class).matching(query(where("id").is(huffyFluffy.id)))

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/query/UpdateTests.java

@@ -35,6 +35,7 @@
  * @author Christoph Strobl
  * @author Thomas Darimont
  * @author Alexey Plotnik
+ * @author Mark Paluch
  */
 public class UpdateTests {
 
@@ -64,8 +65,9 @@ public void testInc() {
 	@Test
 	public void testIncInc() {
 
-		Update u = new Update().inc("size", 1).inc("count", 1);
-		assertThat(u.getUpdateObject()).isEqualTo(Document.parse("{ \"$inc\" : { \"size\" : 1 , \"count\" : 1}}"));
+		Update u = new Update().inc("size").inc("count", 1);
+		assertThat(u.getUpdateObject())
+				.isEqualTo(Document.parse("{ \"$inc\" : { \"size\" : NumberLong(1) , \"count\" : 1}}"));
 	}
 
 	@Test