Question

我有以下动作列表，我想合并它们，以便返回动作列表并逐个执行。

我尝试过

    map(drones => {
      const actions = [];
      drones.forEach((drone) => actions.push(new featureActions.OpenUsedDroneUpdateChannelRequest({ droneId: drone.id, projectId : environment.projectId })));
      actions.push(new featureActions.GetUsedDronesSuccess({drones}));
      return forkJoin(actions);
    }),

我也尝试过

    map(drones => {
      const actions = [];
      drones.forEach((drone) => actions.push(new featureActions.OpenUsedDroneUpdateChannelRequest({ droneId: drone.id, projectId : environment.projectId })));
      actions.push(new featureActions.GetUsedDronesSuccess({drones}));
      return merge(actions);
    }),

展位不起作用

错误错误：效果“ UsedDronesEffect.getUsedDrones $”分派了一个无效的操作：{“ _isScalar”：false}
core.js:15724 ERROR TypeError: Actions must have a type property
    at

如何合并它们？

Answer 1

您可以尝试以下示例，也可以尝试使用mergeMap()组合新操作

@Effect() drones = this.dronesEffect.pipe(
   ...,
   switchMap((res: drones[]) => drones.map(x => new featureActions.OpenUsedDroneUpdateChannelRequest({ droneId: drone.id, projectId : environment.projectId })))
   )
);

查看此Article

Answer 2

您应该能够使用以下操作符mergeMap，switchMap and concatMap`中的一个返回操作数组。它也必须返回一个动作数组，为什么不逐个分发动作？

将多个动作合并为一个动作

2 个答案: