返回观察到的<void>内的另一个观察的<object>

Question

我是新来observables，有它返回Observable<void>， 在这个方法我得叫childMethod返回Observable<responseObject>，之后我得到responseObject我应该发表一个http请求，并返回一个parentMethod Observable<void>，执行的呼叫和顺序很重要，像下面这有语法错误代码。我应该怎么想，我该怎么做？

public childMethod(): Observable<someObject>{ 
    return //.... 
} 
public parentMethod(): Observable<void> { 
    return childMethod() // has error because it returns observable<someObject> 
    .map((response)=>{ 
     return http.post(url, response as someobject) // I want to return this 
    }) 
} 

Answer 1

我只是从@Bergi写的建议。

public childMethod(): Observable<someObject>{ 
    return //.... 
} 
public parentMethod(): Observable<void> { 
    return childMethod() // has error because it returns observable<someObject> 
     .flatMap((response)=>{ 
      return http.post(url, response as someobject) // I want to return this 
     }) 
}