rxjs 地图方法查询

Question

I'm new to reactive. I'm trying to map an observable array from a Firebase database but when using the map method, the property should be an any array but it the method ask for any:

ngOnInit () {

    this.countries=this.af.database.list('/countries').map(resp=>{
        resp.map(...) //   <--- not working since resp is not an array
        return resp;
      })

  }

resp should be an array but intellisense marks it as any so I cannot map resp. Has the map methos an overload?

Answer 1

Usually the response is NOT a json and needs to be parsed first.

Something like :

this.countries=this.af.database.list('/countries').map(resp=>{
    let parsedResp = resp.json();

    parsedResp.map(...) //   <--- not working since resp is not an array
    return parsedResp ;
  })