Don't use String version of enum parameters.

src/main/java/org/springframework/data/couchbase/repository/query/StringBasedN1qlQueryParser.java

@@ -586,7 +586,7 @@ private void addAsArray(JsonObject namedValues, String placeholder, Object o) {
 		Object[] array = (Object[]) o;
 		JsonArray ja = JsonValue.ja();
 		for (Object e : array) {
-			ja.add(String.valueOf(couchbaseConverter.convertForWriteIfNeeded(e)));
+			ja.add(couchbaseConverter.convertForWriteIfNeeded(e));
 		}
 		namedValues.put(placeholder, ja);
 	}

src/test/java/org/springframework/data/couchbase/domain/UserRepository.java

@@ -19,6 +19,7 @@
 import java.util.List;
 import java.util.stream.Stream;
 
+import com.fasterxml.jackson.annotation.JsonValue;
 import org.springframework.cache.annotation.Cacheable;
 import org.springframework.data.couchbase.repository.Collection;
 import org.springframework.data.couchbase.repository.CouchbaseRepository;
@@ -61,6 +62,41 @@ public interface UserRepository extends CouchbaseRepository<User, String> {
 
 	List<User> findByIdIsNotNullAndFirstnameEquals(String firstname);
 
+	List<User> findByFirstname(@Param("firstName")FirstName firstName );
+
+	List<User> findByFirstnameIn(@Param("firstNames")FirstName[] firstNames );
+
+	@Query("#{#n1ql.selectEntity} where #{#n1ql.filter} and (firstname = $firstName)")
+	List<User> queryByFirstnameNamedParameter(@Param("firstName")FirstName firstName );
+
+	@Query("#{#n1ql.selectEntity} where #{#n1ql.filter} and (firstname = $1)")
+	List<User> queryByFirstnamePositionalParameter(@Param("firstName")FirstName firstName );
+
+	enum FirstName {
+		Dave,
+		William
+	}
+
+	@Query("#{#n1ql.selectEntity} where #{#n1ql.filter} and (jsonNode.myNumber = $myNumber)")
+	List<User> queryByIntegerEnumNamed(@Param("myNumber")IntEnum myNumber );
+
+	@Query("#{#n1ql.selectEntity} where #{#n1ql.filter} and (jsonNode.myNumber = $1)")
+	List<User> queryByIntegerEnumPositional(@Param("myNumber")IntEnum myNumber );
+
+	enum IntEnum {
+		One(1),
+		Two(2),
+		OneThousand(1000);
+		Integer value;
+    IntEnum(Integer i){
+			value = i;
+		}
+		@JsonValue
+		public Integer getValue(){
+			return value;
+		}
+	}
+
 	List<User> findByVersionEqualsAndFirstnameEquals(Long version, String firstname);
 
 	@Query("#{#n1ql.selectEntity}|#{#n1ql.filter}|#{#n1ql.bucket}|#{#n1ql.scope}|#{#n1ql.collection}")

src/test/java/org/springframework/data/couchbase/repository/CouchbaseRepositoryQueryIntegrationTests.java

@@ -65,8 +65,8 @@
 import org.springframework.data.couchbase.core.query.N1QLExpression;
 import org.springframework.data.couchbase.core.query.QueryCriteria;
 import org.springframework.data.couchbase.domain.Address;
-import org.springframework.data.couchbase.domain.AirlineRepository;
 import org.springframework.data.couchbase.domain.Airline;
+import org.springframework.data.couchbase.domain.AirlineRepository;
 import org.springframework.data.couchbase.domain.Airport;
 import org.springframework.data.couchbase.domain.AirportJsonValue;
 import org.springframework.data.couchbase.domain.AirportJsonValueRepository;
@@ -739,6 +739,41 @@ public void testTransient() {
 		userRepository.delete(user);
 	}
 
+	@Test
+	public void testEnumParameter() {
+		User user = new User("1", "Dave", "Wilson");
+		userRepository.save(user);
+		User user2 = new User("2", "Frank", "Spalding");
+		userRepository.save(user2);
+
+		List<User> foundUsersEquals = userRepository.findByFirstname(UserRepository.FirstName.Dave);
+		assertEquals(user.getId(), foundUsersEquals.get(0).getId());
+		assertEquals(1, foundUsersEquals.size());
+
+		List<User> foundUsersIn = userRepository.findByFirstnameIn( new UserRepository.FirstName[]{ UserRepository.FirstName.Dave });
+		assertEquals(user.getId(), foundUsersIn.get(0).getId());
+		assertEquals(1, foundUsersIn.size());
+
+		List<User> namedUsers = userRepository.queryByFirstnameNamedParameter( UserRepository.FirstName.Dave);
+		assertEquals(user.getId(), namedUsers.get(0).getId());
+		assertEquals(1, namedUsers.size());
+
+		List<User> positionalUsers = userRepository.queryByFirstnamePositionalParameter( UserRepository.FirstName.Dave);
+		assertEquals(user.getId(), positionalUsers.get(0).getId());
+		assertEquals(1, positionalUsers.size());
+
+		// User objects are initialized with jsonNode.myNumber = 1000
+		List<User> integerEnumUsersNamed = userRepository.queryByIntegerEnumNamed(UserRepository.IntEnum.OneThousand);
+		assertEquals(2, integerEnumUsersNamed.size());
+
+		// User objects are initialized with jsonNode.myNumber = 1000
+		List<User> integerEnumUsersPositional = userRepository.queryByIntegerEnumPositional(UserRepository.IntEnum.OneThousand);
+		assertEquals(2, integerEnumUsersPositional.size());
+
+		userRepository.delete(user);
+		userRepository.delete(user2);
+	}
+
 	@Test
 	public void testCas() {
 		User user = new User("1", "Dave", "Wilson");