循环依赖注入angular 2 [英] Circular dependency injection angular 2

问题描述

我一直在努力将 services 注入彼此.以下博客 构造函数中的循环依赖和依赖注入在它说

I've been struggling around injecting services into each other. The following blog Circular Dependency in constructors and Dependency Injection is kind of confusing where it says

两个对象之一隐藏了另一个对象 C

One of the two objects is hiding another object C

在相互注入服务类时出现以下错误

I get the following error while injecting Service class into each other

无法解析 PayrollService 的所有参数:(SiteService、StorageService、SweetAlertService，?)

Can't resolve all parameters for PayrollService: (SiteService, StorageService, SweetAlertService, ?)

//abstractmodal.service.ts
@Injectable()
 export abstract class AbstractModel {

   abstract collection = [];

   constructor(private siteService: SiteService, private storageService: StorageService,
                private sweetalertService: SweetAlertService) {}


   setCollectionEmpty() {
      this.collection = [];
    }
}
//account-payable.service.ts
@Injectable()
export class AccountPayableService extends AbstractModel {

   public collection = [];

   constructor(private sS: SiteService,private stS: StorageService, private sws: SweetAlertService,
            private accpPoService: PayablePurchaseOrderService, private attachmentService: AttachmentService,
            private injectorService: InjectorService) { 
         super(sS, stS, sws);
     }
}
//injector.service.ts
@Injectable()
export class InjectorService {
   constructor(private payrollService: PayrollService) {}

   cleanPayrollCollection() {
     this.payrollService.setCollectionEmpty();
   }
}
//payroll.service.ts
@Injectable()
export class PayrollService extends AbstractModel {

   public collection = [];

   constructor(private sS: SiteService,private stS: StorageService, private sws: SweetAlertService,
            private accpService: AccountPayableService) { 
    super(sS, stS, sws);
   }
}

您的评论和回答将不胜感激.

Your comments and answered will be appreciated a lot.

谢谢

推荐答案

您可以通过注入 Injector 而不是导致循环依赖的服务之一来解决循环依赖

You can workaround circular dependencies by injecting Injector instead of one of the services that cause the circular dependency

private payrollService:PayrollService;
constructor(/*private payrollService:PayrollService*/ injector:Injector) {
  setTimeout(() => this.payrollService = injector.get(PayrollService));
}

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