DATAMONGO-1497 - MappingMongoConverter now consistently uses DbObjectAccessor.

We now use DbObjectAccessor also for preliminary inspections of the source DBObject (e.g. whether a value is present at all). Previously we operated on the DBObject directly which caused issues with properties mapped to nested fields as the keys weren't exploded correctly and thus the check always failed.

Author: odrotbohm

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

@@ -264,14 +264,14 @@ private <S extends Object> S read(final MongoPersistentEntity<S> entity, final D
 
 		// make sure id property is set before all other properties
 		Object idValue = null;
+		final DBObjectAccessor dbObjectAccessor = new DBObjectAccessor(dbo);
 
-		if (idProperty != null && new DBObjectAccessor(dbo).hasValue(idProperty)) {
+		if (idProperty != null && dbObjectAccessor.hasValue(idProperty)) {
 			idValue = getValueInternal(idProperty, dbo, evaluator, path);
 			accessor.setProperty(idProperty, idValue);
 		}
 
-		final ObjectPath currentPath = path.push(result, entity,
-				idValue != null ? dbo.get(idProperty.getFieldName()) : null);
+		final ObjectPath currentPath = path.push(result, entity, idValue != null ? dbObjectAccessor.get(idProperty) : null);
 
 		// Set properties not already set in the constructor
 		entity.doWithProperties(new PropertyHandler<MongoPersistentProperty>() {
@@ -282,7 +282,7 @@ public void doWithPersistentProperty(MongoPersistentProperty prop) {
 					return;
 				}
 
-				if (!dbo.containsField(prop.getFieldName()) || entity.isConstructorArgument(prop)) {
+				if (entity.isConstructorArgument(prop) || !dbObjectAccessor.hasValue(prop)) {
 					return;
 				}
 
@@ -295,7 +295,7 @@ public void doWithPersistentProperty(MongoPersistentProperty prop) {
 			public void doWithAssociation(Association<MongoPersistentProperty> association) {
 
 				final MongoPersistentProperty property = association.getInverse();
-				Object value = dbo.get(property.getFieldName());
+				Object value = dbObjectAccessor.get(property);
 
 				if (value == null || entity.isConstructorArgument(property)) {
 					return;

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

@@ -2074,6 +2074,18 @@ public void readsDocumentWithPrimitiveIdButNoValue() {
 		assertThat(converter.read(ClassWithIntId.class, new BasicDBObject()), is(notNullValue()));
 	}
 
+	/**
+	 * @see DATAMONGO-1497
+	 */
+	@Test
+	public void readsPropertyFromNestedFieldCorrectly() {
+
+		DBObject source = new BasicDBObject("nested", new BasicDBObject("sample", "value"));
+		TypeWithPropertyInNestedField result = converter.read(TypeWithPropertyInNestedField.class, source);
+
+		assertThat(result.sample, is("value"));
+	}
+
 	static class GenericType<T> {
 		T content;
 	}
@@ -2420,4 +2432,8 @@ public FooBarEnum convert(String source) {
 			throw new ConversionNotSupportedException(source, String.class, null);
 		}
 	}
+
+	static class TypeWithPropertyInNestedField {
+		@Field("nested.sample") String sample;
+	}
 }