DATAMONGO-776 - Improvement in TypeBasedAggregationOperationContext.

TypeBasedAggregationOperationContext's getReference(…) doesn't use a PropertyPath anymore to avoid running the camel case property resolution.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/aggregation/TypeBasedAggregationOperationContext.java

@@ -88,11 +88,10 @@ public class TypeBasedAggregationOperationContext implements AggregationOperatio
 	 */
 	@Override
 	public FieldReference getReference(String name) {
-		PropertyPath path = PropertyPath.from(name, type);
 
-		PersistentPropertyPath<MongoPersistentProperty> propertyPath = mappingContext.getPersistentPropertyPath(path);
+		PersistentPropertyPath<MongoPersistentProperty> propertyPath = mappingContext.getPersistentPropertyPath(name, type);
 
-		return getReferenceFor(field(path.getLeafProperty().getSegment(),
+		return getReferenceFor(field(propertyPath.getLeafProperty().getName(),
 				propertyPath.toDotPath(MongoPersistentProperty.PropertyToFieldNameConverter.INSTANCE)));
 	}
 

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/aggregation/TypeBasedAggregationOperationContextUnitTests.java

@@ -23,7 +23,7 @@ import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mockito.Mock;
 import org.mockito.runners.MockitoJUnitRunner;
-import org.springframework.data.mapping.PropertyReferenceException;
+import org.springframework.data.mapping.model.MappingException;
 import org.springframework.data.mongodb.MongoDbFactory;
 import org.springframework.data.mongodb.core.convert.MappingMongoConverter;
 import org.springframework.data.mongodb.core.convert.QueryMapper;
@@ -56,7 +56,7 @@ public class TypeBasedAggregationOperationContextUnitTests {
 		assertThat(getContext(Foo.class).getReference("bar"), is(notNullValue()));
 	}
 
-	@Test(expected = PropertyReferenceException.class)
+	@Test(expected = MappingException.class)
 	public void rejectsInvalidFieldReference() {
 		getContext(Foo.class).getReference("foo");
 	}