Utilizing a service within NestJS

Question

Utilizing a service within NestJS

I'm currently in the process of updating some older code and I have created a service that I want to inject into the constructor of a class. There are two key points to consider about this particular class. The first point is that it is instantiated by a factory, and the second is that it serves as a parent for another class.

class A extends AParent implements IA {
    constructor(
        protected someService: SomeService,
    )
}


class B extends A {
    constructor(
        protected someService: SomeService,
    )
    super(someService);
}

The issue I am encountering is that the factory is unable to instantiate the A class because its constructor requires a parameter, which is the service.

What would be the most appropriate solution to resolve this problem?

typescript nestjs

Answer 1

Answer №1

Not entirely sure, but perhaps it could be a possible solution.

class X extends ParentX implements IX {
  constructor(protected serviceOne: ServiceOne) // Fixed missing comma after service argument
  {
    // Added missing curly braces for the constructor function.
  }
}

class Y extends X {
  constructor()
  {
    // Since an instance of `ServiceOne` is already available in the parent class,
    // passing it to the constructor of class Y may not be necessary.
  }
}

Answer 2

Not entirely sure, but perhaps it could be a possible solution.

class X extends ParentX implements IX {
  constructor(protected serviceOne: ServiceOne) // Fixed missing comma after service argument
  {
    // Added missing curly braces for the constructor function.
  }
}

class Y extends X {
  constructor()
  {
    // Since an instance of `ServiceOne` is already available in the parent class,
    // passing it to the constructor of class Y may not be necessary.
  }
}

Utilizing a service within NestJS

Answer №1

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