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

Similar questions

Creating a Typescript HttpInterceptor and ensuring its compatibility with minification techniques

Instance property value driven class property type guard

Combining 2 Observables in nestjs Interceptor: A Step-by-Step Guide

You must include an argument for 'model' in the Angular service

Applying Validators manually in Angular 2 beta 17

Error message stating: "Form control with the name does not have a value accessor in Angular's reactive forms."

The error message "@graphql-eslint/eslint-plugin: problem with the "parserOptions.schema" configuration"

Aggregating all elements in an array to generate a Paypal order

What sets apart the Partial and Optional operators in Typescript?

Troubleshooting Typescript with Chrome when packaged by Webpack on Visual Studio 2017 using .NET Core 2.2

The Observable merge operation encountered an error: it cannot access the 'apply' property of an undefined value

The ongoing ESLint conundrum: Balancing between "Unused variable" and "Unknown type" errors when utilizing imports for type annotations

The absence of a function implementation right after the declaration within a TypeScript class is a common issue that needs

Struggling with setting up the onChange function in a Next.js application

Creating a JSON object from an array of data using TypeScript

What is the method to have VIM recognize backticks as quotes?

What is the best way to retrieve an accurately matched array?

What is the process for creating a Deep Copy of an object in Angular?

Getting the local path of a file from an input file in Angular 7

Tips for navigating the material ui Expanded attribute within the Expansion Panel