DATAMONGO-1030 - Projections now work on single-entity query method executions.

We now correctly forward the domain type collection to the query executing a query for a projection type.

Author: odrotbohm

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/repository/query/AbstractMongoQuery.java

@@ -317,7 +317,7 @@ Object execute(Query query) {
 
 			MongoEntityMetadata<?> metadata = method.getEntityInformation();
 			return countProjection ? operations.count(query, metadata.getJavaType()) : operations.findOne(query,
-					metadata.getJavaType());
+					metadata.getJavaType(), metadata.getCollectionName());
 		}
 	}
 

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/repository/AbstractPersonRepositoryIntegrationTests.java

@@ -1011,4 +1011,18 @@ public void shouldExecuteFindOnDbRefCorrectly() {
 	public void shouldFindPersonsWhenUsingQueryDslPerdicatedOnIdProperty() {
 		assertThat(repository.findAll(person.id.in(Arrays.asList(dave.id, carter.id))), containsInAnyOrder(dave, carter));
 	}
+
+	/**
+	 * @see DATAMONGO-1030
+	 */
+	@Test
+	public void executesSingleEntityQueryWithProjectionCorrectly() {
+
+		PersonSummary result = repository.findSummaryByLastname("Beauford");
+
+		assertThat(result, is(notNullValue()));
+		assertThat(result.firstname, is("Carter"));
+		assertThat(result.lastname, is("Beauford"));
+
+	}
 }

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/repository/PersonRepository.java

@@ -313,4 +313,8 @@ public interface PersonRepository extends MongoRepository<Person, String>, Query
 	 */
 	Page<Person> findTop3ByLastnameStartingWith(String lastname, Pageable pageRequest);
 
+	/**
+	 * @see DATAMONGO-1030
+	 */
+	PersonSummary findSummaryByLastname(String lastname);
 }

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/repository/PersonSummary.java

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2014 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.data.mongodb.repository;
+
+/**
+ * @author Oliver Gierke
+ */
+public class PersonSummary {
+
+	String firstname;
+	String lastname;
+}