角材料不显示SelectionChange事件

Question

我在不显示SelectionChange的角度材料中获得问题

<!-- Customer Dropdown -->
<mat-form-field appearance="fill" class="customer-dropdown">
 <mat-label>Select Customer</mat-label>
 <mat-select (selectionChange)="onCustomerChange($event.value)">
   <mat-option *ngFor="let customer of customers$ | async as customers" [value]="customer.id">
     {{ customer.name }}
   </mat-option>
 </mat-select>
</mat-form-field> 

 customerWithFilter$ = this.customerWithProjects$.pipe(map(customers =>
    customers.filter(customers => customers.id  == this.selectedCustomerId )

  ));

  filterProjects(): void {
     this.customerWithFilter$ 
  }

  onCustomerChange(customerId: number): void {
     customerId = this.selectedCustomerId ;
    this.filterProjects();
  }

customerwithfilter可观察到的作品正确。
    

thanks对于穆拉利的建议，我在customer.first_name参数中找到了问题。

    <mat-form-field appearance="fill" class="customer-dropdown">
    <mat-label>Select Customer</mat-label>
    <mat-select (selectionChange)="onCustomerChange($event.value)">
      <mat-option *ngFor="let customer of customers$ | async as customers" [value]="customer.id">
        {{ customer.first_name }}
      </mat-option>
    </mat-select>
  </mat-form-field>

Answer 1