我对Angular非常陌生，正在为几个概念而挣扎。我有一个子组件：

<ng-template #days>
    <div *ngFor="let day of mappedDays">
        <job-day-listing [jobDay]="day" [canEdit]="canEdit" (vehicleSelectChange)="vehicleSelectChanged($event)" (employeeSelectChange)="employeeSelectChanged($event)" (click)="clearSelection()"></job-day-listing>
    </div>
</ng-template>

我需要访问孩子的 typescript 中的“mappedDays”，但我似乎做不到。
我试着在孩子中创建一个输入变量：

@Input() mappedDays: JobDayMapping[];
mappedDays: JobDayMapping[];

在html中：

<ng-template #days>
    <div *ngFor="let day of mappedDays">
        <span>[mappedDays]="mappedDays"</span>
        <job-day-listing [jobDay]="day" [canEdit]="canEdit" (vehicleSelectChange)="vehicleSelectChanged($event)" (employeeSelectChange)="employeeSelectChanged($event)" (click)="clearSelection()"></job-day-listing>
    </div>
</ng-template>

然后，我尝试在数组上调用forEach，但在mappedDays数组上收到一个“undefined”错误：

this.mappedDays.forEach(md => {
  md.addEditButtonSelected = false;
});

我需要服务吗？