使用Scala MongoDB的卡斯巴

Question

嵌套的拉動可以說我有一個簡單的對象

{ 
"id":"xyz" 
"answers" : [{ 
    "name" : "Yes", 
    }, { 
    "name" : "No", 
    }] 
} 

我想從陣列

我想這樣的事情沒有多少運氣刪除答案是：

import com.mongodb.casbah.MongoCollection 

val searchObject = MongoDBObject("id"->"xyz"); 
getCollection().update(searchObject,$pull("answers" -> ("name" -> "Yes"))); 

Answer 1

您需要聲明("name" -> "Yes")爲MongoDBObject因爲看：

scala> $pull("answers" -> ("name" -> "Yes")) 
res10: com.mongodb.casbah.query.Imports.DBObject = { "$pull" : { "answers" : [ "name" , "Yes"]}} 

是不是你想要的，你要哪拉子文檔

：

scala> $pull ("answers" -> MongoDBObject("name" -> "Yes")) 
res11: com.mongodb.casbah.query.Imports.DBObject = { "$pull" : { "answers" : { "name" : "Yes"}}}