setup project

apps/projection/src/app/data-access/fake-http.service.ts

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+import { Injectable } from '@angular/core';
+import {
+  incrementalNumber,
+  rand,
+  randCity,
+  randCountry,
+  randFirstName,
+  randLastName,
+  randNumber,
+  randWord,
+} from '@ngneat/falso';
+import { map, timer } from 'rxjs';
+import { City } from '../model/city.model';
+import { Student } from '../model/student.model';
+import { subject, Teacher } from '../model/teacher.model';
+
+const factoryTeacher = incrementalNumber();
+
+export const randTeacher = () => ({
+  id: factoryTeacher(),
+  firstname: randFirstName(),
+  lastname: randLastName(),
+  subject: rand(subject),
+});
+
+const teachers: Teacher[] = [
+  randTeacher(),
+  randTeacher(),
+  randTeacher(),
+  randTeacher(),
+];
+
+const factoryStudent = incrementalNumber();
+
+export const randStudent = (): Student => ({
+  id: factoryStudent(),
+  firstname: randFirstName(),
+  lastname: randLastName(),
+  mainTeacher: teachers[randNumber({ max: teachers.length })],
+  school: randWord(),
+});
+
+const students: Student[] = [
+  randStudent(),
+  randStudent(),
+  randStudent(),
+  randStudent(),
+  randStudent(),
+];
+
+const factoryCity = incrementalNumber();
+
+export const randomCity = (): City => ({
+  id: factoryCity(),
+  name: randCity(),
+  country: randCountry(),
+});
+
+const cities = [randomCity(), randomCity(), randomCity()];
+
+@Injectable({
+  providedIn: 'root',
+})
+export class FakeHttpService {
+  fetchTeachers$ = timer(500).pipe(map(() => teachers));
+  fetchStudents$ = timer(500).pipe(map(() => students));
+  fetchCities$ = timer(500).pipe(map(() => cities));
+}