从mongo数组中删除嵌套文档

Question

这是我的mongo doc：

{
    "_id" : ObjectId("51f22f6784aefaa97d7e533e"),
    "group_name" : "demo",
    "privileges" : [
        "User Group",
        "Profile Images",
        "Advertisement"
    ],
    "users" : [
        {
            "full_name" : "aap",
            "password" : "as",
            "status" : "Active",
            "user_name" : "as"
        },
        {
            "full_name" : "b",
            "user_name" : "b",
            "password" : "b",
            "status" : "Active"
        },
        {
            "full_name" : "prashant",
            "user_name" : "pt123",
            "status" : "Active"
        }
    ]
}

我想查找所有包含“group_name”的记录：“demo”删除具有“user_name”的特定记录：“pt123”表单用户数组。 我试过了

 db.users.update({"group_name":"demo"}, {$pull:{"users.user_name":"pt123"}})

但没有效果。我缺少哪里？ 请帮忙 我的java代码是

BasicDBObject del = new BasicDBObject("group_name", z);
del.put("users.user_name", x);
BasicDBObject delquery=new BasicDBObject("$match",del);
con.remove(delquery);

Answer 1

以下是您的工作查询：

db.users.update({"group_name":"demo"}, {$pull: {"users":{"user_name":"pt123"}}})

Answer 2

      BasicDBObject sq = new BasicDBObject("group_name", z);
      BasicDBObject idoc=new BasicDBObject("user_name",x);
      BasicDBObject odoc =new BasicDBObject("users",idoc);
      BasicDBObject delq=new BasicDBObject("$pull",odoc);
      con.coll.update(sq, delq);