DATAMONGO-2193 - Fix String <> ObjectId conversion for non-Id properties.

We now make sure to only convert valid ObjectId Strings if the property can be considered as id property.

Original pull request: #640.

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

@@ -907,8 +907,11 @@ public class QueryMapper {
 		@Override
 		public boolean isIdField() {
 
-			MongoPersistentProperty idProperty = (property != null && property.isIdProperty()) ? property
-					: entity.getIdProperty();
+			if(property != null) {
+				return property.isIdProperty();
+			}
+
+			MongoPersistentProperty idProperty = entity.getIdProperty();
 
 			if (idProperty != null) {
 

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

@@ -234,6 +234,7 @@ public class MongoTemplateTests {
 		template.dropCollection(WithGeoJson.class);
 		template.dropCollection(DocumentWithNestedTypeHavingStringIdProperty.class);
 		template.dropCollection(ImmutableAudited.class);
+		template.dropCollection(Outer.class);
 	}
 
 	@Test
@@ -3663,6 +3664,24 @@ public class MongoTemplateTests {
 		assertThat(read.modified).isEqualTo(result.modified).describedAs("Expected auditing information to be read!");
 	}
 
+	@Test // DATAMONGO-2193
+	public void shouldNotConvertStringToObjectIdForNonIdField() {
+
+		ObjectId outerId = new ObjectId();
+		String innerId = new ObjectId().toHexString();
+
+		org.bson.Document source = new org.bson.Document() //
+				.append("_id", outerId) //
+				.append("inner", new org.bson.Document("id", innerId).append("value", "boooh"));
+
+		template.getDb().getCollection(template.getCollectionName(Outer.class)).insertOne(source);
+
+		Outer target = template.findOne(query(where("inner.id").is(innerId)), Outer.class);
+		assertThat(target).isNotNull();
+		assertThat(target.id).isEqualTo(outerId);
+		assertThat(target.inner.id).isEqualTo(innerId);
+	}
+
 	private AtomicReference<ImmutableVersioned> createAfterSaveReference() {
 
 		AtomicReference<ImmutableVersioned> saved = new AtomicReference<>();
@@ -4178,4 +4197,16 @@ public class MongoTemplateTests {
 		@Id String id;
 		@LastModifiedDate Instant modified;
 	}
+
+	static class Outer {
+
+		@Id ObjectId id;
+		Inner inner;
+	}
+
+	static class Inner {
+
+		@Field("id") String id;
+		String value;
+	}
 }

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

@@ -819,6 +819,18 @@ public class QueryMapperUnitTests {
 		assertThat(mappedObject).containsEntry("className", "foo");
 	}
 
+	@Test // DATAMONGO-2193
+	public void shouldNotConvertHexStringToObjectIdForRenamedNestedIdField() {
+
+		String idHex = new ObjectId().toHexString();
+		Query query = new Query(where("nested.id").is(idHex));
+
+		org.bson.Document document = mapper.getMappedObject(query.getQueryObject(),
+				context.getPersistentEntity(RootForClassWithExplicitlyRenamedIdField.class));
+
+		assertThat(document).isEqualTo(new org.bson.Document("nested.id", idHex));
+	}
+
 	@Document
 	public class Foo {
 		@Id private ObjectId id;