使用Firebase提取用户和Geofire查询键需要很长时间

时间:2018-07-28 02:25:05

标签: firebase rxjs ionic3 angularfire2 geofire

我对使用GeoFire和RXJS很陌生。

我需要根据Geofire查询显示附近的用户。我尝试了很多方法,但是要花很长时间,大约需要9段(仅5-6个测试用户)。我该如何优化呢?

非常感谢您的帮助

在Firebase中

-locations
  - userID
      - g
      - l
        - 0:lat
        - 1:long

- users
  -userID
   - firstname: "fname"
   - lastname...

Geofire服务

  

hits = new BehaviorSubject([]);

   getNearLocations(radius: number, coords: Array<number>) {
this.geoFire.query({
  center: coords,
  radius: radius
})
.on('key_entered', (key, location, distance) => {
  let hit = {
    key: key,
    location: location,
    distance: distance,
  }

  let currentHits = this.hits.value
  //this.hits.push(hit)
  currentHits.push(hit)
  this.hits.next(currentHits)
})

people.ts(构造函数)

this.locateActiveUser().then((pos) => {
  this.geofire.getNearLocations(2, [pos.coords.latitude, pos.coords.longitud])

  this.subscription = this.geofire.hits  
  .subscribe( nearUserArray => {
    Promise.all(
      nearUserArray.map(nearUser => {              
        this.afDatabase.object(`users/${nearUser.key}`).query.once('value')
        .then( user => {
          nearUser["user"]= user.val(); })        
          return nearUser
    })).then( a => {
      console.log("nearUserArray: ", nearUserArray);
      this.nearbyUsers$ = of(nearUserArray);
    })   

  }) 

}) 

people.html

  <ion-item *ngFor="let nearby of nearbyUsers$ | async" class="item item-block item-md">
        <ion-row>
          <ion-col col-3 >...
          </ion-col>
          <ion-col col-9 (click)="navigateTo('user-profile', nearby.user)">
              <ion-row>
                  <ion-col col-4 >
                    <span>A {{nearby.distance | roundNumber }} km</span>
                  </ion-col>
              </ion-row>
              <ion-row>
                <h3> {{nearby.user.firstname}} {{nearby.user["lastname"]}}</h3>
              </ion-row>                      
          </ion-col>    
        </ion-row>
      </ion-item>

浏览器控制台

enter image description here

1 个答案:

答案 0 :(得分:0)

因此,我想说您可能正在尽力而为。geofire更像是一个索引,您可以在Firebase RTDB中获得对实际文档/对象的引用。有诸如geofirestore(我的个人宝贝)之类的Firestore库,还有geofirex这样的Firestore库,这些库仅允许您根据位置进行一次查询并获取文档。

geofirestore在幕后工作方式上与geofire更相似,并且可能更容易过渡到(如果您有兴趣的话)