Question

我试图在特定位置附近随机获取20种食物。当我使用它时可以工作，但是如何在$ near中使用聚合 架构：

> select Count,Ts from test1 limit 30;
name: sensor1
time                Count Ts
----                ----- --
1594003971238615143 1     1594003959534
1594003971238615143 10    1594003960446
1594003971238615143 100   1594003969537
1594003971238615143 101   1594003969638
1594003971238615143 102   1594003969739
1594003971238615143 103   1594003969840
1594003971238615143 104   1594003969941
1594003971238615143 105   1594003970042
1594003971238615143 106   1594003970143
1594003971238615143 107   1594003970244
1594003971238615143 108   1594003970345
1594003971238615143 109   1594003970446
1594003971238615143 11    1594003960547
1594003971238615143 110   1594003970547
1594003971238615143 111   1594003970648
1594003971238615143 112   1594003970749
1594003971238615143 12    1594003960648
1594003971238615143 13    1594003960749
1594003971238615143 14    1594003960850
1594003971238615143 15    1594003960951
1594003971238615143 16    1594003961053
1594003971238615143 17    1594003961154
1594003971238615143 18    1594003961255
1594003971238615143 19    1594003961356
1594003971238615143 2     1594003959638
1594003971238615143 20    1594003961457
1594003971238615143 21    1594003961558
1594003971238615143 22    1594003961659
1594003971238615143 23    1594003961760
1594003971238615143 24    1594003961861

const foodSchema = new Schema({
      foodName: {
        type: String,
        required: true
      },
      image: {
        type: String,
        required: true
      },
      price: {
        type: String,
        required: true
      },
      shopName: {
        type: String,
        required: true
      },
      isVerified:{
        type:Boolean,
        default:false,
        required:true
      },
      isEnabled:{
        type:Boolean,
        default:false,
        required:true
      }
      ,
      location: {
        type: { type: String },
        coordinates: [],
        
       },
      shopId:{
        type: Schema.Types.ObjectId,
        ref: 'Shop',
        required: true
      }
      
    });
    
    foodSchema.index({ location: "2dsphere" });

MongoError：在此上下文中不允许$ geoNear，$ near和$ nearSphere 如何在$ near猫鼬附近使用集合函数来在特定位置附近获取随机食物

Answer 1

您能尝试这样的事情吗？

Food.aggregate
([
   {
     $geoNear: {
        near: { type: "Point", coordinates: [13.3339, 80.1943] },
        distanceField: "dist.calculated",
        maxDistance: 10000,
        query: { "isEnabled": true }
     }
   }
])

在聚合框架中，$geoNear应该是管道中的第一个管道，您可以使用query来过滤结果，而不必使用match。

如何将聚合与$ near猫鼬一起使用？

1 个答案: