與Neo4jClient沒有特定關係的返回節點

Question

我正在開發一個使用Neo4jClient與Neo4j圖形數據庫交談的.NET社交照片應用程序。我想這一個特定的用戶尚未看到所有的照片，我可以用暗號查詢完成：

MATCH (user:User)-[:USER_PHOTO]-(photo:Photo) 
OPTIONAL MATCH (photo)-[r:USER_SEEN_PHOTO]-(currentUser:User) 
WHERE (currentUser.Id = 'user2') 
WITH photo,user, count(currentUser) AS cnt 
WHERE cnt = 0 
RETURN DISTINCT photo, user; 

Unfortunalety我不知道如何正確地翻譯這Neo4jClient。我想下面的查詢，但預期它不工作，它的返回照片已經看到用戶2：

var graphResults = await graphClient.Cypher 
      .Match("(user:User)-[:USER_PHOTO]->(photo:Photo)") 
      .OptionalMatch("user-[:USER_SEEN_PHOTO]-(currentUser:User)") 
      .Where((UserEntity currentUser) => currentUser.Id == currentUserId) 
      .With("user, photo, count(currentUser) AS cnt") 
      .Where("cnt = 0") 
      .ReturnDistinct((photo, user) => new 
      { 
       Photo = photo.As<PhotoEntity>(), 
       User = user.As<UserEntity>() 
      }).ResultsAsync; 

Answer 1

如果你看一下你的.OptionalMatch發言，我想你需要從改變：

.OptionalMatch("user-[:USER_SEEN_PHOTO]-(currentUser:User)") 

到

.OptionalMatch("photo-[:USER_SEEN_PHOTO]-(currentUser:User)") 
       ^^^