我是Observable的新手,我不确定自己是否做得正确。
这是场景。
a)订阅路由参数
b)当参数更改时,发出服务请求以获取可观察的数据
c)处理数据
d)然后对它们的依赖项进行更多请求并获取其依赖项可观察值。
我的问题是,在d)之后,我可以很好地获取它们的依赖项可观察值,但是我没有到已处理数据的映射来根据需要附加响应。
示例:
this.route.queryParams.pipe(map((params) => {
this.selectedTabIndex = +params['tabIndex'];
return params
})).pipe(switchMap((params) => {
return this.eventService.getEvent(params['eventID']);
})).pipe(map((event) => {
this.event = event;
this.selectedActivities = event.getActivities();
return this.selectedActivities;
})).pipe(mergeMap((activities) => {
return combineLatest(activities.map((activity) => {
return this.eventService.getStreams(this.event.getID(), activity.getID(), ['Latitude', 'Longitude'])
}))
})).pipe(map((activityStreams) => {
// Here is my problem
// As you can see I can get well the streams for the above activities
// But I don't have the activity that the streams belong to to attach them to
debugger
})).subscribe()
因此,在最后一个管道中,结果如下:
但是如您所见,我没有引用那些流数组最后应该附加到的活动。这就是我想要做的。
也许我做的事情完全错误,所以我愿意讨论。
答案 0 :(得分:0)
在Sheshaj Awasthi的帮助下
我做了以下事情:
this.route.queryParams.pipe(map((params) => {
this.selectedTabIndex = +params['tabIndex'];
return params
})).pipe(switchMap((params) => {
return this.eventService.getEvent(params['eventID']);
})).pipe(map((event) => {
this.event = event;
this.selectedActivities = event.getActivities();
return this.selectedActivities;
})).pipe(map((activities) => {
return activities.reduce((activityStreamPairArray, activity) => {
activityStreamPairArray.push({
activity: activity,
activityStreams: this.eventService.getStreams(this.event.getID(), activity.getID(), ['Latitude', 'Longitude']),
});
return activityStreamPairArray
}, [])
})).pipe(mergeMap((activityStreamPairArray) => {
return combineLatest(activityStreamPairArray.reduce((flattenedArray, activityStreamPair) => {
flattenedArray.push(of(activityStreamPair.activity), activityStreamPair.activityStreams);
return flattenedArray
}, []))
})).pipe(map((test) => {
debugger
}))
现在我有
由一个数组组成,每2个元素可以组合在一起。