DATAMONGO-493 - Added test case to show the described scenario is working.

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/convert/QueryMapperUnitTests.java

@@ -21,7 +21,9 @@ import static org.springframework.data.mongodb.core.query.Criteria.*;
 import static org.springframework.data.mongodb.core.query.Query.*;
 
 import java.math.BigInteger;
+import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.List;
 
 import org.bson.types.ObjectId;
 import org.junit.Before;
@@ -212,6 +214,23 @@ public class QueryMapperUnitTests {
 		assertThat(((DBObject) result.get("nested")).get("id"), is(instanceOf(String.class)));
 	}
 
+	/**
+	 * @see DATAMONGO-493
+	 */
+	@Test
+	@SuppressWarnings({ "unchecked", "rawtypes" })
+	public void foo() {
+
+		Query query = Query.query(Criteria.where("id").is("id_value").and("publishers").ne("a_string_value"));
+
+		DBObject dbObject = mapper.getMappedObject(query.getQueryObject(), context.getPersistentEntity(UserEntity.class));
+		assertThat(dbObject.get("publishers"), isA((Class) DBObject.class));
+
+		DBObject publishers = (DBObject) dbObject.get("publishers");
+		assertThat(publishers.containsField("$ne"), is(true));
+		assertThat(publishers.get("$ne"), is((Object) "a_string_value"));
+	}
+
 	class IdWrapper {
 		Object id;
 	}
@@ -237,4 +256,9 @@ public class QueryMapperUnitTests {
 	enum Enum {
 		INSTANCE;
 	}
+
+	class UserEntity {
+		String id;
+		List<String> publishers = new ArrayList<String>();
+	}
 }