Question

我正试图通过使用静态forRoot（）来提供自定义服务的方法，但是......

我收到以下错误 - 即使我已导出menuServiceFactory函数用作工厂我也尝试将其导出为const值。

ERROR in Error: Error encountered resolving symbol values statically. Calling function 'MenuModule', function calls are not supported. Consider replacing the function or lambda with a reference to an exported function, resolving symbol AppModule in ...

相关代码 -

import { NgModule, ModuleWithProviders, SkipSelf, Optional } from '@angular/core';
import { CommonModule } from '@angular/common';
import { MenuComponent } from './menu.component';
import { MenuService } from './menu.service';
import { MdMenuModule, MdToolbarModule, MdButtonModule } from '@angular/material';
import { FlexLayoutModule } from '@angular/flex-layout';
import { SecurityModule, SecurityService } from '@savantly/ngx-security';

@NgModule({
  imports: [
    CommonModule,
    MdMenuModule, MdToolbarModule, MdButtonModule, FlexLayoutModule, SecurityModule
  ],
  exports: [
    CommonModule,
    MdMenuModule, MdToolbarModule, MdButtonModule, FlexLayoutModule,
    SecurityModule,
    MenuComponent],
  declarations: [MenuComponent],
  providers: []
})
export class MenuModule {

  static forRoot(options?: any): ModuleWithProviders {
    if (options && options.securityService) {
      return {
        ngModule: MenuModule,
        providers: [{
            provide: MenuService,
            useFactory: menuServiceFactory,
            deps: [options.securityService]
          }]
      }
    } else {
      return {
        ngModule: MenuModule,
        providers: [MenuService]
      };
    }
  }

  constructor (@Optional() @SkipSelf() parentModule: MenuModule) {
    if (parentModule) {
      throw new Error(
        'MenuModule is already loaded. Import it in the AppModule only');
    }
  }
 }

export function menuServiceFactory(_securityService: SecurityService): MenuService {
  return new MenuService(_securityService);
}

Answer 1

使用@yurzui帮助 - 这是重构模块 -

+---------------+---------------------+----------+-------+
|    BatchId    |     CreateDate      |  UserId  | Batch |
+---------------+---------------------+----------+-------+
| 4L182855 - 2  | 2017-09-28 15:19:32 | 4L182855 |     9 |
| 4L182855 - 4  | 2017-09-28 17:57:20 | 4L182855 |     9 |
| 4L182855 - 8  | 2017-09-29 12:30:27 | 4L182855 |     0 |
| 4L182855 - 10 | 2017-09-29 14:20:57 | 4L182855 |     0 |
+---------------+---------------------+----------+-------+

Angular 4.x - 不支持函数调用。考虑使用对导出函数的引用替换函数或lambda

1 个答案: