mongodb中嵌入文档的值的不同列表

Question

我疯了......我来自sql世界，这是我第一次使用mongodb体验。

我有一个给定的json / object结构（我知道，这不是完美的，但由于现有数据和其他应用程序必须如此），存储在mongodb（v3.4）中，Restheart作为http前端。

文件看起来像这样

{
    "_id" : ObjectId("5855cbc9fc3baea81e937261"),
    "_etag" : ObjectId("5855cbc99b971700050d8adc"),
    "log" : [
        "858489b087f7472dbb8d1012dee4cd5d.d",
        NumberLong("12345678901234"),
        {
            "ext" : {
                "text" : "someone did something at somewhere (some street 123) +38 USD",
                "markup" : [
                    [
                        "user",
                        {
                            "plain" : "someone",
                            "team" : "master"
                        }
                    ], [
                        "TEXT",
                        {
                            "plain" : " did something at "
                        }
                    ], [
                        "location",
                        {
                            "name" : "somewhere",
                            "plain" : "some street 123",
                            "team" : "master"
                        }
                    ], [
                        "TEXT",
                        {
                            "plain" : "38"
                        }
                    ], [
                        "TEXT",
                        {
                            "plain" : "USD"
                        }
                    ]
                ],
                "category" : 1,
                "team" : "master"
            }
        }
    ]
}

我想获得一个usern.plain名称的明确列表。从理论上讲，db.logs.distinct("log.2.ext.markup.0.1.plain")会完全符合我的需要。但据我所知，没有办法将db.distinct与Restheart一起使用。我尝试使用视图，但似乎，我也不能在视图中使用db.distinct。

这是我的实验......

{ "aggrs" : [
  { "stages" : [
        { "_$project" : { "user" : "$log.2.ext.markup.0.1.plain"}},
        { "_$unwind" : "$user"},
        { "_$unwind" : "$user"},
        { "_$unwind" : "$user"},
        { "_$unwind" : "$user"},
        { "_$unwind" : "$user"},
        { "_$unwind" : "$user"},
        { "_$group" : { "_id" : "$user"}}
      ],
    "type" : "pipeline",
    "uri" : "unique_users1"
  },
  { "stages" : [
        { "_$match": { "log": { "_$exists": true, "_$ne": null }}},
        { "_$unwind" : "$log"},
        { "_$unwind" : "$log.2"},
        { "_$unwind" : "$log.2.ext"},
        { "_$unwind" : "$log.2.ext.markup"},
        { "_$unwind" : "$log.2.ext.markup.0"},
        { "_$unwind" : "$log.2.ext.markup.0.1"},
        { "_$group" : { "_id" : "$log.2.ext.markup.0.1.plain"}}
      ],
    "type" : "pipeline",
    "uri" : "unique_users2"
  },
  { "stages" : [
        { "_$match" : {"log" : { "_$exists" : true }}},
        { "_$replaceRoot" : { "newRoot" : { "user": "$log.2.ext.markup.0.1.plain"}}}
      ],
      "type" : "pipeline",
      "uri" : "unique_users3"
  },
  { "stages" : [
        { "_$group" : { "_id" : 1 , "users" : { "_$addToSet" : "$log.2.ext.markup.0.1.plain"}}}
      ],
    "type" : "pipeline",
    "uri" : "unique_users4"
  }
]}

但结果是......没什么或几乎没有什么

{
"_embedded": {
    "rh:result": [
        {
            "_id": 1,
            "users": [
                []
            ]
        }
    ]
},
"_returned": 1,
"_size": 1,
"_total_pages": 1
}