Allow id to be type other than String.

src/main/java/org/springframework/data/couchbase/core/CouchbaseTemplateSupport.java

@@ -87,7 +87,7 @@ public CouchbaseDocument encodeEntity(final Object entityToEncode) {
 	}
 
 	@Override
-	public <T> T decodeEntity(String id, String source, Long cas, Class<T> entityClass, String scope, String collection) {
+	public <T> T decodeEntity(Object id, String source, Long cas, Class<T> entityClass, String scope, String collection) {
 
 		// this is the entity class defined for the repository. It may not be the class of the document that was read
 		// we will reset it after reading the document
@@ -146,7 +146,7 @@ public <T> T decodeEntity(String id, String source, Long cas, Class<T> entityCla
 		if (cas != null && cas != 0 && persistentEntity.getVersionProperty() != null) {
 			accessor.setProperty(persistentEntity.getVersionProperty(), cas);
 		}
-		N1qlJoinResolver.handleProperties(persistentEntity, accessor, template.reactive(), id, scope, collection);
+		N1qlJoinResolver.handleProperties(persistentEntity, accessor, template.reactive(), id.toString(), scope, collection);
 		return accessor.getBean();
 	}
 

src/main/java/org/springframework/data/couchbase/core/NonReactiveSupportWrapper.java

@@ -40,7 +40,7 @@ public Mono<CouchbaseDocument> encodeEntity(Object entityToEncode) {
 	}
 
 	@Override
-	public <T> Mono<T> decodeEntity(String id, String source, Long cas, Class<T> entityClass, String scope,
+	public <T> Mono<T> decodeEntity(Object id, String source, Long cas, Class<T> entityClass, String scope,
 			String collection) {
 		return Mono.fromSupplier(() -> support.decodeEntity(id, source, cas, entityClass, scope, collection));
 	}

src/main/java/org/springframework/data/couchbase/core/ReactiveCouchbaseTemplateSupport.java

@@ -86,7 +86,7 @@ public Mono<CouchbaseDocument> encodeEntity(final Object entityToEncode) {
 	}
 
 	@Override
-	public <T> Mono<T> decodeEntity(String id, String source, Long cas, Class<T> entityClass, String scope,
+	public <T> Mono<T> decodeEntity(Object id, String source, Long cas, Class<T> entityClass, String scope,
 			String collection) {
 		return Mono.fromSupplier(() -> {
 			// this is the entity class defined for the repository. It may not be the class of the document that was read
@@ -118,7 +118,7 @@ public <T> Mono<T> decodeEntity(String id, String source, Long cas, Class<T> ent
 						+ TemplateUtils.SELECT_ID);
 			}
 
-			final CouchbaseDocument converted = new CouchbaseDocument(id);
+			final CouchbaseDocument converted = new CouchbaseDocument(id.toString());
 
 			// if possible, set the version property in the source so that if the constructor has a long version argument,
 			// it will have a value and not fail (as null is not a valid argument for a long argument). This possible failure
@@ -146,7 +146,7 @@ public <T> Mono<T> decodeEntity(String id, String source, Long cas, Class<T> ent
 			if (cas != null && cas != 0 && persistentEntity.getVersionProperty() != null) {
 				accessor.setProperty(persistentEntity.getVersionProperty(), cas);
 			}
-			N1qlJoinResolver.handleProperties(persistentEntity, accessor, template, id, scope, collection);
+			N1qlJoinResolver.handleProperties(persistentEntity, accessor, template, id.toString(), scope, collection);
 			return accessor.getBean();
 		});
 	}

src/main/java/org/springframework/data/couchbase/core/ReactiveInsertByIdOperationSupport.java

@@ -84,7 +84,7 @@ public Mono<T> one(T object) {
 			return Mono.just(object).flatMap(support::encodeEntity)
 					.flatMap(converted -> template.getCouchbaseClientFactory().withScope(pArgs.getScope())
 							.getCollection(pArgs.getCollection()).reactive()
-							.insert(converted.getId(), converted.export(), buildOptions(pArgs.getOptions(), converted))
+							.insert(converted.getId().toString(), converted.export(), buildOptions(pArgs.getOptions(), converted))
 							.flatMap(result -> support.applyUpdatedId(object, converted.getId())
 									.flatMap(updatedObject -> support.applyUpdatedCas(updatedObject, converted, result.cas()))))
 					.onErrorMap(throwable -> {

src/main/java/org/springframework/data/couchbase/core/ReactiveReplaceByIdOperationSupport.java

@@ -84,7 +84,7 @@ public Mono<T> one(T object) {
 			return Mono.just(object).flatMap(support::encodeEntity)
 					.flatMap(converted -> template.getCouchbaseClientFactory().withScope(pArgs.getScope())
 							.getCollection(pArgs.getCollection()).reactive()
-							.replace(converted.getId(), converted.export(),
+							.replace(converted.getId().toString(), converted.export(),
 									buildReplaceOptions(pArgs.getOptions(), object, converted))
 							.flatMap(result -> support.applyUpdatedCas(object, converted, result.cas())))
 					.onErrorMap(throwable -> {

src/main/java/org/springframework/data/couchbase/core/ReactiveTemplateSupport.java

@@ -27,7 +27,7 @@ public interface ReactiveTemplateSupport {
 
 	Mono<CouchbaseDocument> encodeEntity(Object entityToEncode);
 
-	<T> Mono<T> decodeEntity(String id, String source, Long cas, Class<T> entityClass, String scope, String collection);
+	<T> Mono<T> decodeEntity(Object id, String source, Long cas, Class<T> entityClass, String scope, String collection);
 
 	<T> Mono<T> applyUpdatedCas(T entity, CouchbaseDocument converted, long cas);
 

src/main/java/org/springframework/data/couchbase/core/ReactiveUpsertByIdOperationSupport.java

@@ -84,7 +84,7 @@ public Mono<T> one(T object) {
 			return Mono.just(object).flatMap(support::encodeEntity)
 					.flatMap(converted -> template.getCouchbaseClientFactory().withScope(pArgs.getScope())
 							.getCollection(pArgs.getCollection()).reactive()
-							.upsert(converted.getId(), converted.export(), buildUpsertOptions(pArgs.getOptions(), converted))
+							.upsert(converted.getId().toString(), converted.export(), buildUpsertOptions(pArgs.getOptions(), converted))
 							.flatMap(result -> support.applyUpdatedId(object, converted.getId())
 									.flatMap(updatedObject -> support.applyUpdatedCas(updatedObject, converted, result.cas()))))
 					.onErrorMap(throwable -> {

src/main/java/org/springframework/data/couchbase/core/TemplateSupport.java

@@ -26,7 +26,7 @@ public interface TemplateSupport {
 
 	CouchbaseDocument encodeEntity(Object entityToEncode);
 
-	<T> T decodeEntity(String id, String source, Long cas, Class<T> entityClass, String scope, String collection);
+	<T> T decodeEntity(Object id, String source, Long cas, Class<T> entityClass, String scope, String collection);
 
 	<T> T applyUpdatedCas(T entity, CouchbaseDocument converted, long cas);
 

src/main/java/org/springframework/data/couchbase/core/mapping/CouchbaseDocument.java

@@ -49,7 +49,7 @@ public class CouchbaseDocument implements CouchbaseStorable {
 	/**
 	 * Represents the document ID used to identify the document in the bucket.
 	 */
-	private String id;
+	private Object id;
 
 	/**
 	 * Contains the expiration time of the document.
@@ -68,7 +68,7 @@ public CouchbaseDocument() {
 	 *
 	 * @param id the document ID.
 	 */
-	public CouchbaseDocument(final String id) {
+	public CouchbaseDocument(final Object id) {
 		this(id, DEFAULT_EXPIRATION_TIME);
 	}
 
@@ -78,7 +78,7 @@ public CouchbaseDocument(final String id) {
 	 * @param id the document ID.
 	 * @param expiration the expiration time of the document.
 	 */
-	public CouchbaseDocument(final String id, final int expiration) {
+	public CouchbaseDocument(final Object id, final int expiration) {
 		this.id = id;
 		this.expiration = expiration;
 		content = new TreeMap<>();
@@ -245,7 +245,7 @@ public CouchbaseDocument setExpiration(int expiration) {
 	 *
 	 * @return the ID of the document.
 	 */
-	public String getId() {
+	public Object getId() {
 		return id;
 	}
 
@@ -255,7 +255,7 @@ public String getId() {
 	 * @param id the ID of the document.
 	 * @return the {@link CouchbaseDocument} for chaining.
 	 */
-	public CouchbaseDocument setId(String id) {
+	public CouchbaseDocument setId(Object id) {
 		this.id = id;
 		return this;
 	}