Unable to link to 'Attribute A' because it is not recognized as a valid property of 'Subcomponent'

Within my project, I have a generic class with several components that inherit from it.

BaseRdnInput.ts:

   @Injectable()
    export abstract class BaseRdnInput implements ControlValueAccessor, Validator {
    
      @Input() rdnModel?: any | Array<any>;
      @Output() rdnModelChange: EventEmitter<any | Array<any>> = new EventEmitter<any | Array<any>>();
      // additional code follows...
    }

RdnInputComponent.ts:

@Component({
  // tslint:disable-next-line:component-selector
  selector: 'rdn-input',
  templateUrl: './rdn-input.component.html'
})
export class RdnInputComponent extends BaseRdnInput implements OnInit, AfterViewInit {
 // more code here...
constructor(public changeDetectorRef: ChangeDetectorRef) {
    super(changeDetectorRef);
  };
// additional code follows
}

Subsequently, I utilize this component in ContractComponent.html:

<rdn-input [(rdnModel)]='headerEntity.saleNo'></rdn-input>

Upon including this line of code, an error emerges :

Can't bind to 'rdnModel' since it isn't a known property of 'rdn-input'.

  1. If 'rdn-input' is an Angular component and it has 'rdnModel' input, then verify that it is part of this module.
  2. If 'rdn-input' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message.
  3. To allow any property add 'NO_ERRORS_SCHEMA' to the '@NgModule.schemas' of this component.

Prior to upgrading, everything was functioning correctly. My concern aligns closely with this scenario: Angular2 RC5: Can't bind to 'Property X' since it isn't a known property of 'Child Component'. It appears that there are steps to circumvent this issue, with the pivotal one being: verifying if we added @input to the property of the subclass or adding attr to the binding property of the parent. As evident, I have already included @input in BaseRdnInput.ts:. Moreover, resorting to attr might impede the downward transmission of properties to nested directives. Is there an alternative approach to address this concern?

Answer №1

I was the author of the accepted answer on the question you referenced. It's been a while since I worked with Angular, but after some troubleshooting, I believe I may have figured it out.

The issue seems to be related to inheritance. I came across a relevant answer that explains:

If a class inherits from a parent class without declaring its own constructor, it will inherit the constructor and parameter metadata from the parent class.

In the case of RdnInputComponent, because it has its own constructor, it is not inheriting the decorator metadata from the base class. Removing the constructor causes an error regarding the missing decorator on BaseRdnInput. To resolve this, as suggested by @Yngve B-Nilsen, adding @Directive() should fix the issue (you can see the working solution in this stackblitz link).

Another option is to include the inherited properties as inputs and outputs in the metadata of RdnInputComponent, which also seems to work (check out this stackblitz example):

@Component({
  selector: 'rdn-input',
  templateUrl: './rdn-input.component.html',
  inputs: ['rdnModel'],
  outputs: ['rdnModelChange']
})
export class RdnInputComponent extends BaseRdnInput {
// ...

I hope this explanation helps!

Answer №2

It is important to adorn your base class with the @Directive() annotation instead of using @Injectable

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