如何查询：过滤其中的场所属于某个位置的事件？

Question

美好的一天。我有3个集合和架构：

locations : 
 - id (Auto generated by firebase)
 - location_city
 - location_country

venues: 
  - id ( auto generated by firebase)
  - venue_name
  - venue_address
  - location_id (this is related to the locations collection)

events: 
  - id (auto generated by firebase)
  - event_name
  - venues: 
     [0] venue_id_1
     [1] venue_id_2

我要过滤的事件属于一个位置，例如，列出在日本东京可用的所有事件

这是到目前为止我尝试过的（Angular 7），我是Firebase的新手，所以不确定我在写对还是错...

//过滤器组件调用

filterEvents() {
    this.filterByEvents = true;
    if (!this.executedEventFilter) {
      this.executedEventFilter = true;
      this.LocationManagementService.filterByEvents(this.LocationManagementService.locationId);
    }

该服务的句柄

  filterByEvents(locationId) {
    const locationsRef = firebase.database().ref().child("locations");
    const venuesRef = firebase.database().ref().child("venues");
    const eventsRef = firebase.database().ref().child("events");
    return new Promise<any>((resolve, reject) => {
    eventsRef.on('child_added', (snapEvent) => {
      console.log(snapEvent);

    }) 
  });
  }