類型錯誤：collection.group是不是在貓鼬的功能

Question

這裏是telecalling收集

{ 
    "product": "a", 
    "demo": true, 
    "followups": [ 
     { 
      "followup": "2017-05-03T07:54:41.085Z", 
      "actiondone": "enquiry" 
     }, 
     { 
      "followup": "2017-05-05T07:54:41.085Z", 
      "actiondone": "followup" 
     } 
    ], 
    "createdAt": "2017-05-03T07:54:41.085Z", 
}, 
{ 
    "product": "b", 
    "demo": false, 
    "followups": [ 
     { 
      "followup": "2017-05-04T07:54:41.085Z", 
      "actiondone": "followup" 
     }, 
     { 
      "followup": "2017-05-10T07:54:41.085Z", 
      "actiondone": "installation" 
     } 
    ], 
    "createdAt": "2017-05-04T07:54:41.085Z", 
}, 
{ 
    "product": "a", 
    "demo": false, 
    "followups": [ 
     { 
      "followup": "2017-05-06T07:54:41.085Z", 
      "actiondone": "followup" 
     } 
    ], 
    "createdAt": "2017-05-06T07:54:41.085Z", 
} 

在這裏，我需要按產品，並得到多少演示，諮詢，followups和裝置完成的數據。

以下是一個

var mongoose = require('mongoose'); 
var telecalling = mongoose.model('telecalling'); 
summaryReport: function(request,response){ 
     telecalling.group({ 
      key: {product: 1}, 
      cond: {"createdAt": {"$gte": new Date(request.body.fromdate),"$lte": new Date(request.body.todate)}}, 
      reduce: function(curr, result) { 
       if(curr.demo==true){ 
        result.demos++; 
       } 
       var fups = curr.followups; 
       fups.forEach(allCounts); 
       function allCounts(fup){ 
        var action = fup.actiondone.toLowerCase() 
        if(action=='enquiry'){ 
         result.enquiries++; 
        } 
        if(action=='followup'){ 
         result.followups++; 
        } 
        if(action=='installation'){ 
         result.installations++; 
        } 
       } 
      }, 
      initial: {enquiries: 0, followups: 0, installations: 0} 
     }, function(err,res){ 
      if(err){ 
       response.json(err); 
      } 
      else{ 
       response.json(res); 
      } 
     }); 
} 

我得到類型錯誤控制器：telecalling.group不是一個函數。如果我在shell中執行此操作，我會得到結果爲

[ 
    { 
      "product" : "Fair Automobiles", 
      "enquiries" : 7, 
      "followups" : 15, 
      "installations" : 0, 
      "demos" : NaN 
    }, 
    { 
      "product" : "Fair Fertilizers", 
      "enquiries" : 1, 
      "followups" : 0, 
      "installations" : 0 
    } 
] 

我在哪裏做錯了。請幫助我。

Answer 1

貓鼬模型沒有.group()方法。對於大多數情況，你應該使用.aggregate()，所以值得學習。

繼承人的等價操作：

telecalling.aggregate([ 
    { "$match": { 
    "createdAt": { 
     "$gte": new Date(request.body.fromdate), 
     "$lte": new Date(request.body.todate) 
    } 
    }} 
    { "$group": { 
    "_id": "$product", 
    "demos": { 
     "$sum": { 
     "$cond": { 
      "if": { "$eq": [ "$demo", true ] }, 
      "then": 1, 
      "else": 0 
     } 
     } 
    }, 
    "enquries": { 
     "$sum": { 
     "$size": { 
      "$filter": { 
      "input": "$followups", 
      "as": "f", 
      "cond": { "$eq": [ "$$f.actiondone", "enquiry" ] } 
      } 
     } 
     } 
    }, 
    "followups": { 
     "$sum": { 
     "$size": { 
      "$filter": { 
      "input": "$followups", 
      "as": "f", 
      "cond": { "$eq": [ "$$f.actiondone", "followup" ] } 
      } 
     } 
     } 
    }, 
    "installations": { 
     "$sum": { 
     "$size": { 
      "$filter": { 
      "input": "$followups", 
      "as": "f", 
      "cond": { "$eq": [ "$$f.actiondone", "installation" ] } 
      } 
     } 
     } 
    } 
    }} 
],function(err,response) { 
    // work with result 
}) 

首先，你有一個$match這是完全一樣的查詢參數。

下一頁，因爲你的操作是相當簡單的，你必須使用"product"的_id鍵單$group階段就像你的.group()一樣。

"demos"字段有一個邏輯值，您可以使用$cond運算符使用數字切換，然後傳遞給$sum。

實際字段是有點棘手，首先要了解，但基本上你用$filter陣列上找到匹配指定"actiondone"的項目，然後用$size得到過濾列表，並通過的「大小」說到$sum累加器進行計數。