DATAMONGO-324 - Added shortcut in MappingMongoConverter to allow reading DBObjects without conversion.

Added check in MappingMongoConverter.read(…) to shortcut object conversion if the requested type is DBObject.

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

@@ -182,6 +182,10 @@ public class MappingMongoConverter extends AbstractMongoConverter implements App
 		if (conversions.hasCustomReadTarget(dbo.getClass(), rawType)) {
 			return conversionService.convert(dbo, rawType);
 		}
+		
+		if (DBObject.class.isAssignableFrom(rawType)) {
+			return (S) dbo;
+		}
 
 		if (typeToUse.isCollectionLike() && dbo instanceof BasicDBList) {
 			return (S) readCollectionOrArray(typeToUse, (BasicDBList) dbo);

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

@@ -764,7 +764,7 @@ public class MappingMongoConverterUnitTests {
 	 * @see DATAMONGO-309
 	 */
 	@Test
-	@SuppressWarnings({ "unchecked", "rawtypes" })
+	@SuppressWarnings({ "unchecked" })
 	public void writesArraysAsMapValuesCorrectly() {
 		
 		ClassWithMapProperty wrapper = new ClassWithMapProperty();
@@ -786,6 +786,39 @@ public class MappingMongoConverterUnitTests {
 		assertThat(list, hasItem((Object) "bar"));
 	}
 	
+	/**
+	 * @see DATAMONGO-324
+	 */
+	@Test
+	public void writesDbObjectCorrectly() {
+	
+		DBObject dbObject = new BasicDBObject();
+		dbObject.put("foo", "bar");
+		
+		DBObject result = new BasicDBObject();
+		
+		converter.write(dbObject, result);
+		
+		result.removeField(DefaultMongoTypeMapper.DEFAULT_TYPE_KEY);
+		assertThat(dbObject, is(result));
+	}
+	
+	/**
+	 * @see DATAMONGO-324
+	 */
+	@Test
+	public void readsDbObjectCorrectly() {
+		
+		DBObject dbObject = new BasicDBObject();
+		dbObject.put("foo", "bar");
+		
+		DBObject result = converter.read(DBObject.class, dbObject);
+		
+		assertThat(result, is(dbObject));
+	}
+	
+	
+	
 	class GenericType<T> {
 		T content;
 	}
@@ -817,6 +850,7 @@ public class MappingMongoConverterUnitTests {
 		String city;
 	}
 
+	
 	interface Contact {
 
 	}