Add support for Spring Data Couchbase custom type key

See gh-19789

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/data/couchbase/CouchbaseDataProperties.java

@@ -17,6 +17,7 @@
 package org.springframework.boot.autoconfigure.data.couchbase;
 
 import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.data.couchbase.core.convert.DefaultCouchbaseTypeMapper;
 import org.springframework.data.couchbase.core.query.Consistency;
 
 /**
@@ -39,6 +40,12 @@ public class CouchbaseDataProperties {
 	 */
 	private Consistency consistency = Consistency.READ_YOUR_OWN_WRITES;
 
+	/**
+	 * Name of the field that will store the type information for complex types when using
+	 * MappingCouchbaseConverter.
+	 */
+	private String typeKey = DefaultCouchbaseTypeMapper.DEFAULT_TYPE_KEY;
+
 	public boolean isAutoIndex() {
 		return this.autoIndex;
 	}
@@ -55,4 +62,12 @@ public class CouchbaseDataProperties {
 		this.consistency = consistency;
 	}
 
+	public String getTypeKey() {
+		return this.typeKey;
+	}
+
+	public void setTypeKey(String typeKey) {
+		this.typeKey = typeKey;
+	}
+
 }

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/data/couchbase/SpringBootCouchbaseDataConfiguration.java

@@ -97,4 +97,9 @@ class SpringBootCouchbaseDataConfiguration extends AbstractCouchbaseDataConfigur
 		return new IndexManager(false, false, false);
 	}
 
+	@Override
+	public String typeKey() {
+		return this.properties.getTypeKey();
+	}
+
 }

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/data/couchbase/CouchbaseDataAutoConfigurationTests.java

@@ -40,6 +40,7 @@ import org.springframework.data.couchbase.config.BeanNames;
 import org.springframework.data.couchbase.config.CouchbaseConfigurer;
 import org.springframework.data.couchbase.core.CouchbaseTemplate;
 import org.springframework.data.couchbase.core.convert.CouchbaseCustomConversions;
+import org.springframework.data.couchbase.core.convert.DefaultCouchbaseTypeMapper;
 import org.springframework.data.couchbase.core.mapping.CouchbaseMappingContext;
 import org.springframework.data.couchbase.core.mapping.event.ValidatingCouchbaseEventListener;
 import org.springframework.data.couchbase.core.query.Consistency;
@@ -127,6 +128,22 @@ class CouchbaseDataAutoConfigurationTests {
 				.isTrue();
 	}
 
+	@Test
+	void typeKeyIsClassByDefault() {
+		load(CouchbaseTestConfigurer.class);
+		AbstractCouchbaseDataConfiguration couchbaseDataConfiguration = this.context
+				.getBean(AbstractCouchbaseDataConfiguration.class);
+		assertThat(couchbaseDataConfiguration.typeKey()).isEqualTo(DefaultCouchbaseTypeMapper.DEFAULT_TYPE_KEY);
+	}
+
+	@Test
+	void customTypeKey() {
+		load(CouchbaseTestConfigurer.class, "spring.data.couchbase.type-key=custom");
+		AbstractCouchbaseDataConfiguration couchbaseDataConfiguration = this.context
+				.getBean(AbstractCouchbaseDataConfiguration.class);
+		assertThat(couchbaseDataConfiguration.typeKey()).isEqualTo("custom");
+	}
+
 	private void load(Class<?> config, String... environment) {
 		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
 		TestPropertyValues.of(environment).applyTo(context);