Angular 7 abstract data service

data.service.ts

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { SimpleModel } from '../models/common/SimpleModel';
import { Observable } from 'rxjs';

@Injectable({
  providedIn: 'root'
})
export class DataService<T extends SimpleModel> {

  private url: string = 'http://localhost:5000/api';

  constructor(
    private httpClient: HttpClient,
    private endpoint: string
  ) { }

  getAll(): Observable<T[]> {
    console.log("getAll");
    return this.httpClient
      .get<T[]>(`${this.url}/${this.endpoint}`);
  }

  get(id: number): Observable<T> {
    console.log("get", id);
    return this.httpClient
      .get<T>(`${this.url}/${this.endpoint}/${id}`);
  }

  add(item: T): Observable<T> {
    console.log("add", item);
    return this.httpClient
      .post<T>(`${this.url}/${this.endpoint}`, item);
  }

  update(item: T): Observable<T> {
    console.log("update", item);
    return this.httpClient
      .put<T>(`${this.url}/${this.endpoint}/${item.id}`, item);
  }

  delete(id: number) {
    console.log("delete", id);
    return this.httpClient
      .delete(`${this.url}/${this.endpoint}/${id}`);
  }
}