CycleJS Collection返回旧数据

时间:2017-02-07 15:04:23

标签: rxjs5 cyclejs

我正在尝试为RxJS 5重新创建RxMarbles,但是当我更改集合的数据(特别是数据源的长度)时,我遇到了反馈问题。

我添加console.log s进行调试

注意那些熟悉RxMarbles的人,我将“Diagram”重命名为“Timeline”。

import { svg } from '@cycle/dom';
import isolate from '@cycle/isolate';
import { Observable } from 'rxjs';
import { apply, flip, map, max, merge, path, prop, sortBy, zip } from 'ramda';

import { Collection } from '../collection';

import { Marble } from './marble';
import { EndMarker } from './end-marker';

function sortMarbleDoms$(marbles$) {
  const doms$ = Collection.pluck(marbles$, prop('DOM'));
  const dataList$ = Collection.pluck(marbles$, prop('data'));

  return Observable.combineLatest(doms$, dataList$, zip)
    .map(sortBy(path([1, 'time'])))
    .map(map(prop(0)));
}

function OriginalTimeline({ DOM, marbles: marblesState$, end: end$ }) {
  const marblesProps$ = end$.map(({ time }) => ({
    minTime: 0,
    maxTime: time,
  }));
  const endMarkerProps$ = marblesState$.map(marbles => ({
    minTime: marbles.map(prop('time')).reduce(max, 0),
    maxTime: 100,
  }));

  const marblesSources = { DOM, props: marblesProps$ };
  const endMarkerSources = {
    DOM,
    props: endMarkerProps$,
    time: end$.pluck('time'),
  };

  const marbles$ = Collection.gather(
    Marble, marblesSources, marblesState$
    .do(a=>console.log('marblesState', a)), '_itemId');
  const marbleDOMs$ = sortMarbleDoms$(marbles$);
  const endMarker = EndMarker(endMarkerSources);

  const vtree$ = Observable.combineLatest(marbleDOMs$, endMarker.DOM)
    .map(([marbleDOMs, endMarkerDOM]) =>
      svg({
        attrs: { viewBox: '0 0 100 10' },
        style: { width: 500, height: 50, overflow: 'visible' },
      }, [
        svg.line({
          attrs: { x1: 0, x2: 100, y1: 5, y2: 5 },
          style: { stroke: 'black', strokeWidth: 0.4 },
        }),
        endMarkerDOM,
        ...marbleDOMs,
      ])
    );

  const marbleData$ = Collection.pluck(marbles$, prop('data'))
    .withLatestFrom(marblesState$, zip)
    .map(map(apply(flip(merge))))

  const data$ = Observable.combineLatest(marbleData$, endMarker.time)
    .map(([marbles, endMarkerTime]) => ({
      marbles,
      end: { time: endMarkerTime },
    }))
    .debounceTime(1);

  return { DOM: vtree$, data: data$.do(a=>console.log('tdata', a)) };
}

export function Timeline(sources) {
  return isolate(OriginalTimeline)(sources);
}

应用程序的基本结构是所有必要的数据都被送入一个虚拟驱动程序的全局接收器,它只接收数据并按原样重新发送(理论上,所有输出都应该是新输入)。 / p>

因此,问题可能出在我的代码的其他部分,所以如果有帮助,我很乐意发布代码的codepen / plunkr。这确实有时会起作用,但不是所有时间。

这是控制台输出(删节)

store Object {route: "merge", inputs: undefined}

timeline.js:39 marblesState [Object, Object, Object, Object]
timeline.js:69 tdata Object {marbles: Array[3], end: Object}
sandbox.js:48 data [Object, Object]
app.js:26 store Object {route: "merge", inputs: Array[2]}

注意marblesState有4个对象,但tdata返回带有3个对象数组的弹珠。出于某种原因,Collection只返回3个项目。

感谢任何帮助。谢谢!

1 个答案:

答案 0 :(得分:0)

我不知道为什么这有意义,但向上移动debounceTime(1)使其工作

const marbleData$ = Collection.pluck(marbles$, prop('data'))
  .debounceTime(1)
  .withLatestFrom(marblesState$, zip)
  .map(map(apply(flip(merge))))

const data$ = Observable.combineLatest(marbleData$, endMarker.time)
  .map(([marbles, endMarkerTime]) => ({
    marbles,
    end: { time: endMarkerTime },
  }));

Collection.pluck为每条新旧数据发送一次。