todo.service.ts

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';

import { TodoItem, TodoItemCreate, TodoItemUpdate } from './models';
import { Constants } from './constants';
import { BaseService } from './base.service';

@Injectable()
export class TodoService extends BaseService<TodoItem, TodoItemCreate, TodoItemUpdate> {
    constructor(private readonly httpClient: HttpClient) {
        super(httpClient, Constants.apiEndpoints.todoItems);
    }
}

todoItemsModels.ts

/*
    This is the Read model, and the getbyId & getAll must return this data model (as per the api contract).
*/
export interface TodoItem {
    id: string;
    title: string;
    description: string;
    tags: string;
}

/*
    This is the Create model, and the create function of todoService (derived from base srevice) must accept this data model (as per the api contract).
*/
export interface TodoItemCreate {
    title: string;
    description: string;
    tags: string;
}

/*
    This is the Update model, and the update function of todoService (derived from base srevice) must accept this data model (as per the api contract).
*/
export interface TodoItemUpdate {
    description: string;
    tags: string;
}