UmerIftikhar

export class Constants {
    public static apiRoot = '/api', // If there is some prefix for all the APIs, then define that in constants.
    public static API_VERSIONS = {
        Version1: 'version1',
    };
    public static pageSettings(): PageEvent {
        return {
            length: 0,
            pageIndex: 0,
            pageSize: 10,

UmerIftikhar

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) {

UmerIftikhar

import { HttpClient, HttpParams, HttpHeaders } from '@angular/common/http';
import { Observable, throwError } from 'rxjs';
import urljoin from 'url-join';
import { catchError } from 'rxjs/operators';

/*
  This should be placed in some miscellaneous folder.
*/
export function constructApiVersionQueryParams(inputParams: HttpParams, apiVersion: string): HttpParams {
    if (inputParams && inputParams.keys().length > 0) {