用于社交应用程序的MongoDB新闻源架构设计

Question

我正在开发一个社交应用程序，用户可以上传相册，更新其状态并关注其他用户。我正在使用Node.js + MongoDB。我需要显示新闻提要，其中每个用户都可以获得其关注者的更新。

这是我的架构设计：

1个档案集

{
_id:'p1',
name:'siraj'
} 

2粉丝收藏

{
profileId:2,
followerId:3
}

profile_album collection

{
_id:al1,
ownerId:1,
imageUrl:'www.google.com'
}

profile_status集合

{
_id:st1,
text:'hey im fine'
}

动作集

{
_id:ac1,
actorId:1,
sourceId:'al1',
sourceType:'album'
}
{
_id:ac1,
actorId:1,
sourceId:'st1',
sourceType:'status'
}

user_feed collection

{
_id:1,
profileId:1,
actionId:ac1
}

我需要获取包含个人资料状态和相册详情的Feed项目。

有人可以帮我构建查询吗？我尝试了$lookup，但它一次只能选择一个文档（相册或状态）。我需要查询状态和相册供稿。如果我使用单独的查询并按日期的desc顺序排序，该怎么做。

这是我尝试的聚合代码：

mongoUtil.db().collection('feed_action').aggregate([
        {$match: {actorId: ObjectId(profileId), hidden: false}},
        {$sort: {'created_date': -1}},
        {$skip: offset}, {$limit: count},
        {
            $lookup: {
                from: "profile",
                localField: "actorId",
                foreignField: "_id",
                as: "actor"
            }
        },
        //{$unwind: '$actor'},
        {
            $unwind: {
                path: "$actor",
                preserveNullAndEmptyArrays: true
            }
        },
        {
            $lookup: {
                from: "profile_album",
                localField: "sourceId",
                foreignField: "_id",
                as: "profileAlbum"
            }
        },
        {
            $unwind: {
                path: "$profileAlbum",
                preserveNullAndEmptyArrays: true
            }
        },

        {$match: {'profileAlbum.status': 1}},
        {
            $lookup: {
                from: "media",
                localField: "mediaId",
                foreignField: "_id",
                as: "media"
            }
        },
        //{$unwind: '$media'},
        {
            $unwind: {
                path: "$media",
                preserveNullAndEmptyArrays: true
            }
        },
        {
            $project: {
                actor: {
                    Password: 0,
                    HashPassword: 0,
                    ZodiacSign: 0,
                    RoleId: 0,
                    Geners: 0,
                    Interests: 0,
                    Dob: 0,
                    CreatedDate: 0,
                    Gender: 0,
                    Status: 0,
                    SystemFileName: 0,
                    FileName: 0,
                    Path: 0,
                    PrivateProfile: 0
                },
                media: {
                    _id: 0,
                    systemFileName: 0,
                    source: 0,
                    profileId: 0,
                    created_date: 0,
                    updated_date: 0
                }

            }
        },
        {
            $project: {
                action: {
                    'actionId': '$_id',
                    'description': '$description',
                    "source": "$source",
                    "sourceId": "$sourceId",
                    "created_date": "$created_date",
                    'profileAlbum': {
                        "_id": "$profileAlbum._id",
                        "profileId": "$profileAlbum.profileId",
                        "title": '$profileAlbum.title',
                        "likes": '$profileAlbum.likes',
                        "comments": '$profileAlbum.comments'
                    }
                }, actor: 1, media: 1, _id: 0
            }
        }
    ])

提前致谢。