Question

这是我的样本数据库集合：

{ 
    "_id" : ObjectId("5a9797b480591678e0771190"), 
    "staff_id" : NumberInt(172), 
    "temp_name" : "Regular Employment", 
    "individual_setting" : false, 
    "employment_category" : "Regular Employee", 
    "branch_office" : "Cebu Branch Office", 
    "availability_status" : "Incumbent", 
    "req_working_hours" : "08:00", 
    "fixed_brk_time_from" : "12:00", 
    "fixed_brk_time_to" : "13:00", 
    "sch_time_setting" : [
        {
            "holiday" : [
                "Saturday", 
                "Friday"
            ], 
            "biweekly_odd" : [

            ], 
            "biweekly_even" : [
                "Saturday"
            ], 
            "clock_in_mon" : "08:40", 
            "clock_in_tue" : "08:40", 
            "clock_in_wed" : "08:40", 
            "clock_in_thu" : "08:40", 
            "clock_in_fri" : "08:40", 
            "clock_in_sat" : "08:40", 
            "clock_in_sun" : null, 
            "clock_in_hol" : null, 
            "clock_out_mon" : "18:00", 
            "clock_out_tue" : "18:00", 
            "clock_out_wed" : "18:00", 
            "clock_out_thu" : "18:00", 
            "clock_out_fri" : "18:00", 
            "clock_out_sat" : "18:00", 
            "clock_out_sun" : null, 
            "clock_out_hol" : null, 
            "_id" : ObjectId("5a9797b480591678e077118f")
        }
    ], 
    "date_to_start" : ISODate("2018-03-01T06:03:32.050+0000"), 
    "createdAt" : ISODate("2018-03-01T06:03:32.066+0000"), 
    "updatedAt" : ISODate("2018-03-01T06:03:32.066+0000"), 
    "__v" : NumberInt(0)
}

在clock_in_mon字段下的字段clock_in_hol到sch_time_setting之间，我想计算有多少字段有数据或不为空。因为每个员工都有不同的time_setting，所以这些字段在其他员工中可能只有很少的数据。

此预期的计数为：6，因为只有clock_in_mon到clock_in_sat才有数据。

我在这里尝试了代码Count fields in a MongoDB Collection，但我不能在我的案例中做到。

Answer 1

尝试以下聚合：

<!DOCTYPE html>
<html lang="en">

<head>
  <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.3.14/angular.min.js"></script>
  <!-- script src="script.js"></script -->
</head>

<body class="no-skin" ng-app="myapp" ng-controller="ctrl">

  <table ng-table="tableParams" class="display table table-striped table-bordered">
    <thead>
      <tr>
        <th width="2%">Sr.No</th>
        <th width="10%">Category Type <span class="error">*</span></th>
        <th width="10%">Product <span class="error">*</span></th>
        <th width="10%">Sub Category</th>
      </tr>
    </thead>
    <tr ng-repeat="cap in data">

      <td>{{$index+1}}</td>

      <td data-title="'Category Type'" sortable="Category Type">
        <select class="form-control" id="tags" type="text" ng-model="cap.categoryid" placeholder="Category Type" name="categoryid" required="" ng-init="loadcat()" ng-change="GetProduct(cap.categoryid);GetSubCategory(cap.categoryid,cap.productname)">	
              <option value="">Select</option>
              <option ng-repeat="cat in CategoryArray" value="{{cat.Category_Id}}">{{cat.Category_Name}}</option>
            </select>
      </td>

      <td data-title="'Product'" sortable="Product">
        <select class="form-control" type="text" name="productname" ng-model="cap.productname" placeholder="Enter Product Name" required ng-change="GetSubCategory(cap.categoryid,cap.productname)" />
        <option value="">select</option>
        <option ng-repeat="pro in ProductsArray" value="{{pro.ProductId}}">{{pro.ProductlName}}</option>
        </select>
      </td>

      <td data-title="'Sub Category1'" sortable="Sub Category1">
        <select class="form-control" type="text" name="subcategoryid" ng-model="cap.subcategoryid" id="subcategoryid">
             <option value="">Select</option>
             <option ng-repeat="subcatid in subcatids" value="{{subcatid.Sub_category_Id}}">{{subcatid.Sub_Category_Name}} </option>
            </select>
      </td>

      <td>
        <div class="pull-right">
          <a ng-click="addFormField()" ng-if="data.length==$index+1" class='btn btn-default btn-xs' autofocus data-dismiss="modal"> <i class="glyphicon glyphicon-plus"></i></a>
          <a ng-click="remove_Row($index)" class='btn btn-primary btn-xs' autofocus data-dismiss="modal"> <i class="glyphicon glyphicon-remove"></i></a>
        </div>
      </td>

    </tr>
  </table>
</body>

</html>

要分析您的文档，您需要比较键名称。要做到这一点，你必须使用$objectToArray运算符转换并反对键值对列表。然后，您可以找到db.yourCollectionName.aggregate([ { $project: { totalClockIns: { $map: { input: "$sch_time_setting", as: "setting", in: { _id: "$$setting._id", kvPairs: { $objectToArray: "$$setting" } } } } } }, { $project: { totalClockIns: { $map: { input: "$totalClockIns", as: "clockIn", in: { _id: "$$clockIn._id", count: { $size: { $filter: { input: "$$clockIn.kvPairs", as: "pair", cond: { $and: [ {$eq: [{ $indexOfBytes: [ "$$pair.k", "clock_in_" ] },0]},{$ne: ["$$pair.v",null]}] } } } } } } } } } ])名称以key开头（使用$indexOfBytes）并且值不等于clock_的那些对。使用$filter你可以摆脱所有其他对，你需要做的就是使用$size来获得数组的长度。

这将为您提供以下结果：

null

计数字段包含具有聚合mongodb的集合中的数据

1 个答案: