Mongodb 我应该选择mongo聚合还是应该在应用程序级服务上选择它

我有以下收藏

公司：

用户：

主题类别

话题

尺寸

询问

用户响应

上面发生了什么

每个用户都属于一个公司

每个主题都属于一个主题类别

每个查询都属于一个主题

每个查询都有一个维度

用户可以回答有关评级的查询

用户对每个问题的回答将存储在用户回答中

我想要达到的目标

基于主题类别和维度

预期聚合结果格式

查询基于一个主题类别

每个主题的所有问题都根据主题进行汇总

每个主题都会根据维度计算出平均评分 回应

我可以使用Mongo聚合实现这一点，还是应该在服务级别实现这一点？

我试过做什么

我得到了什么

还需要什么

• 每个回答都有一个问题。每个问题都有一个维度
• 我需要得到基于维度的平均评分

---

谢谢。

您想将

主题类别

和

维度

ID作为输入传递吗？如果是这样，在哪里可以使用

公司

集合？我认为您应该只使用聚合，由于投影的字段有限。@styopdev

Topic category id

是一个输入，但需要从每个回答中的问题中提取

Dimension

。@saikatchakrabortty我能够根据主题对结果进行分组，并且能够以数组的形式获取与主题相关的回答。现在，我如何根据回答中问题的维度得出平均值。我在这里很惊讶。也许你应该使用$group运算符，如果你将当前查询添加到问题中，会更清楚。

{
"_id" : ObjectId("5a7848e8ca70273218e9d743"),
"name" : "Google",
"departments" : [ 
    {
        "name" : "IT",
        "_id" : "1234567890"
    }, 
    {
        "name" : "Sales",
        "_id" : "1234567891"
    }
]
}

{
    "_id" : ObjectId("5a784977ca70273218e9d759"),
    "name" : "Sankarshan",
    "company" : ObjectId("5a7848e8ca70273218e9d743"),
    "department" : "1234567890"
}

{
"_id" : ObjectId("5a784a10ca70273218e9d76f"),
"name" : "topicCtegoryOne",
"order" : 1
}

{
"_id" : ObjectId("5a784cc3ca70273218e9d7d3"),
"topicCategory" : ObjectId("5a784a10ca70273218e9d76f"),
"name" : "TopicOne",
"order" : 1,
"label" : "oneTopic",
"color" : "red"
}

{
"_id" : ObjectId("5a784fdcca70273218e9d869"),
"name" : "dimentionOne"
}

{
"_id" : ObjectId("5a78519aca70273218e9d8d7"),
"topic" : ObjectId("5a784cc3ca70273218e9d7d3"),
"dimention" : ObjectId("5a784fdcca70273218e9d869"),
"order" : 1,
"label" : "queryLabelOne",
"statement" : "This is one question - Top1"
}

{
"_id" : ObjectId("5a7859f5ca70273218e9da7d"),
"user" : ObjectId("5a784977ca70273218e9d759"),
"company" : ObjectId("5a7848e8ca70273218e9d743"),
"department" : "1234567890",
"response" : {
    "question" : ObjectId("5a78519aca70273218e9d8d7"),
    "topic" : ObjectId("5a784cc3ca70273218e9d7d3"),
    "topicCategory" : ObjectId("5a784a10ca70273218e9d76f"),
    "dimention" : ObjectId("5a784fdcca70273218e9d869"),
    "rating" : 5,
    "color" : "red"
}
}

{
"topicCategory": "topic category",
"topics": [
    {
        "topicLabel": "label of the topic one",
        "dimentions": [
            {
                "name": "dimention name one",
                "avgValue": 5.6
            }
            {
                "name": "dimention name two",
                "avgValue": 4.5
            }
        ]
    },
    {
        "topicLabel": "label of the topic two",
        "dimentions": [
            {
                "name": "dimention name one",
                "avgValue": 6.6
            }
            {
                "name": "dimention name two",
                "avgValue": 9.5
            }
        ]
    }

]   
}

db.getCollection('collResp').aggregate([
{
    $match: 
    { 
        company: ObjectId("5a7848e8ca70273218e9d743"),
        department: "1234567890"
    }
},
{
    $group: {
        _id: {
            topic: "$response.topic",
            category: "$response.topicCategory"
        },
        responses: {
            $push: "$response"
        }
    }
},
{
    $lookup: {
        from: 'topics',
        localField: '_id.topic',
        foreignField: '_id',
        as: "topic"
    }
},
{
    $unwind: {
        path: "$topic"
    }
},
{
    $lookup: {
        from: 'topicCategories',
        localField: '_id.category',
        foreignField: '_id',
        as: "category"
    }
},
{
    $unwind: {
        path: "$category"
    }
}
])

/* 1 */
{
"_id" : {
    "topic" : ObjectId("5a78512cca70273218e9d8bd"),
    "category" : ObjectId("5a784a10ca70273218e9d76f")
},
"responses" : [ 
    {
        "question" : ObjectId("5a7851a6ca70273218e9d8d9"),
        "topic" : ObjectId("5a78512cca70273218e9d8bd"),
        "topicCategory" : ObjectId("5a784a10ca70273218e9d76f"),
        "dimention" : ObjectId("5a784fdcca70273218e9d869"),
        "rating" : 8,
        "color" : "red"
    }, 
    {
        "question" : ObjectId("5a78580eca70273218e9da10"),
        "topic" : ObjectId("5a78512cca70273218e9d8bd"),
        "topicCategory" : ObjectId("5a784a10ca70273218e9d76f"),
        "dimention" : ObjectId("5a7851d5ca70273218e9d8ee"),
        "rating" : 7,
        "color" : "red"
    }
],
"topic" : {
    "_id" : ObjectId("5a78512cca70273218e9d8bd"),
    "topicCategory" : ObjectId("5a784a10ca70273218e9d76f"),
    "name" : "TopicTwo",
    "order" : 2,
    "label" : "twoTopic",
    "color" : "green"
},
"category" : {
    "_id" : ObjectId("5a784a10ca70273218e9d76f"),
    "name" : "topicCtegoryOne",
    "order" : 1
}
}

/* 2 */
{
"_id" : {
    "topic" : ObjectId("5a784cc3ca70273218e9d7d3"),
    "category" : ObjectId("5a784a10ca70273218e9d76f")
},
"responses" : [ 
    {
        "question" : ObjectId("5a78519aca70273218e9d8d7"),
        "topic" : ObjectId("5a784cc3ca70273218e9d7d3"),
        "topicCategory" : ObjectId("5a784a10ca70273218e9d76f"),
        "dimention" : ObjectId("5a784fdcca70273218e9d869"),
        "rating" : 5,
        "color" : "red"
    }, 
    {
        "question" : ObjectId("5a785807ca70273218e9da0e"),
        "topic" : ObjectId("5a784cc3ca70273218e9d7d3"),
        "topicCategory" : ObjectId("5a784a10ca70273218e9d76f"),
        "dimention" : ObjectId("5a7851d5ca70273218e9d8ee"),
        "rating" : 3,
        "color" : "red"
    }
],
"topic" : {
    "_id" : ObjectId("5a784cc3ca70273218e9d7d3"),
    "topicCategory" : ObjectId("5a784a10ca70273218e9d76f"),
    "name" : "TopicOne",
    "order" : 1,
    "label" : "oneTopic",
    "color" : "red"
},
"category" : {
    "_id" : ObjectId("5a784a10ca70273218e9d76f"),
    "name" : "topicCtegoryOne",
    "order" : 1
}
}