Test that repository finder methods work as expected.

Author: christophstrobl

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

@@ -1422,4 +1422,19 @@ void annotatedQueryShouldAllowAggregationInProjection() {
 		Person target = repository.findWithAggregationInProjection(alicia.getId());
 		assertThat(target.getFirstname()).isEqualTo(alicia.getFirstname().toUpperCase());
 	}
+
+	@Test // GH-3602
+	void executesQueryWithDocumentReferenceCorrectly() {
+
+		Person josh = new Person("Josh", "Long");
+		User dave = new User();
+		dave.id = "dave";
+
+		josh.setSpiritAnimal(dave);
+
+		operations.save(josh);
+
+		List<Person> result = repository.findBySpiritAnimal(dave);
+		assertThat(result).map(Person::getId).containsExactly(josh.getId());
+	}
 }

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

@@ -27,6 +27,7 @@
 import org.springframework.data.mongodb.core.index.Indexed;
 import org.springframework.data.mongodb.core.mapping.DBRef;
 import org.springframework.data.mongodb.core.mapping.Document;
+import org.springframework.data.mongodb.core.mapping.DocumentReference;
 import org.springframework.data.mongodb.core.mapping.Field;
 import org.springframework.data.mongodb.core.mapping.Unwrapped;
 
@@ -74,6 +75,9 @@ public enum Sex {
 	@Unwrapped.Nullable(prefix = "u") //
 	User unwrappedUser;
 
+	@DocumentReference
+	User spiritAnimal;
+
 	public Person() {
 
 		this(null, null);
@@ -308,6 +312,14 @@ public void setUnwrappedUser(User unwrappedUser) {
 		this.unwrappedUser = unwrappedUser;
 	}
 
+	public User getSpiritAnimal() {
+		return spiritAnimal;
+	}
+
+	public void setSpiritAnimal(User spiritAnimal) {
+		this.spiritAnimal = spiritAnimal;
+	}
+
 	/*
 	* (non-Javadoc)
 	*

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

@@ -410,4 +410,6 @@ Person findPersonByManyArguments(String firstname, String lastname, String email
 	List<Person> findByUnwrappedUserUsername(String username);
 
 	List<Person> findByUnwrappedUser(User user);
+
+	List<Person> findBySpiritAnimal(User user);
 }