向 Firebase 规则添加索引

Question

我正在使用 GeoFire 根据用户的当前位置从 Firebase 查询数据。我得到：

Using an unspecified index. Consider adding ".indexOn": "g" at / to your security rules for better performance

在控制台中。下面是我的查询代码：

            ref = Database.database().reference()
            let geoFire = GeoFire(firebaseRef: ref)

            let center = CLLocation(latitude: (userLocation.coordinate.latitude), longitude: (userLocation.coordinate.longitude))

            let circleQuery = geoFire?.query(at: center, withRadius: 1)

            circleQuery?.observe(.keyEntered, with: { key, location in

                guard let key = key else { return }

                geoFire?.getLocationForKey(key, withCallback: { (location, error) in

                    let myAnnotation: MKPointAnnotation = MKPointAnnotation()
                    myAnnotation.coordinate = CLLocationCoordinate2DMake((location?.coordinate.latitude)!, (location?.coordinate.longitude)!);
                    self.currentLocationMapView.addAnnotation(myAnnotation)      
                })


                self.ref.child("services").child(key).observeSingleEvent(of: .value, with: { (snapshot) in

                    let value = snapshot.value as? NSDictionary
                    let servicename = value?["name"] as? String ?? ""
                    let address = value?["address"] as? String ?? ""

                    self.nameArray.append(servicename)
                    self.addressArray.append(address)


                    if (self.nameArray.count > 0) {
                        self.customTableView.reloadData();     
                    }

                })

            }) 

我的 Firebase 规则选项卡具有以下设置。

"rules": {
    ".read": true,
        ".write": "auth != null"
          }

无论我在哪里插入“.indexOn”："g"，我都会出错并且无法保存规则。有帮助吗？

Answer 1

documentation points you to examples.

"rules": {
  ".read": true,
  ".write": "auth != null",
  ".indexOn": ["g"]
}