Answer: 1

apps/angular/1-projection/src/app/component/city-card/city-card.component.ts

@@ -1,9 +1,42 @@
-import { ChangeDetectionStrategy, Component } from '@angular/core';
+import { NgOptimizedImage } from '@angular/common';
+import { ChangeDetectionStrategy, Component, inject } from '@angular/core';
+import { CityStore } from '../../data-access/city.store';
+import { CardRowDirective } from '../../ui/card/card-row.directive';
+import { CardComponent } from '../../ui/card/card.component';
+import { ListItemComponent } from '../../ui/list-item/list-item.component';
 
 @Component({
   selector: 'app-city-card',
-  template: 'TODO City',
-  imports: [],
+  template: `
+    <app-card [items]="cities()" (addNewItem)="onNewItemAdded()">
+      <img ngSrc="assets/img/student.webp" width="200" height="200" />
+
+      <ng-template [cardRow]="cities()" let-city>
+        <app-list-item (delete)="onDelete(city.id)">
+          <div>{{ city.name }}</div>
+        </app-list-item>
+      </ng-template>
+    </app-card>
+  `,
+  imports: [
+    CardComponent,
+    NgOptimizedImage,
+    CardRowDirective,
+    ListItemComponent,
+  ],
+  providers: [CityStore],
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
-export class CityCardComponent {}
+export class CityCardComponent {
+  private store = inject(CityStore);
+
+  cities = this.store.cities;
+
+  onNewItemAdded() {
+    this.store.addOne();
+  }
+
+  onDelete(id: number) {
+    this.store.deleteOne(id);
+  }
+}

apps/angular/1-projection/src/app/component/student-card/student-card.component.ts

@@ -1,40 +1,52 @@
-import {
-  ChangeDetectionStrategy,
-  Component,
-  inject,
-  OnInit,
-} from '@angular/core';
-import { FakeHttpService } from '../../data-access/fake-http.service';
+import { NgOptimizedImage } from '@angular/common';
+import { ChangeDetectionStrategy, Component, inject } from '@angular/core';
 import { StudentStore } from '../../data-access/student.store';
-import { CardType } from '../../model/card.model';
+import { CardRowDirective } from '../../ui/card/card-row.directive';
 import { CardComponent } from '../../ui/card/card.component';
+import { ListItemComponent } from '../../ui/list-item/list-item.component';
 
 @Component({
   selector: 'app-student-card',
   template: `
     <app-card
-      [list]="students()"
-      [type]="cardType"
-      customClass="bg-light-green" />
+      class="bg-light-green"
+      [items]="students()"
+      (addNewItem)="onNewItemAdded()">
+      <img ngSrc="assets/img/student.webp" width="200" height="200" />
+
+      <ng-template [cardRow]="students()" let-student>
+        <app-list-item (delete)="onDelete(student.id)">
+          <div>{{ student.firstName }}</div>
+        </app-list-item>
+      </ng-template>
+    </app-card>
   `,
   styles: [
     `
-      ::ng-deep .bg-light-green {
+      .bg-light-green {
         background-color: rgba(0, 250, 0, 0.1);
       }
     `,
   ],
-  imports: [CardComponent],
+  imports: [
+    CardComponent,
+    NgOptimizedImage,
+    CardRowDirective,
+    ListItemComponent,
+  ],
+  providers: [StudentStore],
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
-export class StudentCardComponent implements OnInit {
-  private http = inject(FakeHttpService);
+export class StudentCardComponent {
   private store = inject(StudentStore);
 
   students = this.store.students;
-  cardType = CardType.STUDENT;
 
-  ngOnInit(): void {
-    this.http.fetchStudents$.subscribe((s) => this.store.addAll(s));
+  onNewItemAdded() {
+    this.store.addOne();
+  }
+
+  onDelete(id: number) {
+    this.store.deleteOne(id);
   }
 }

apps/angular/1-projection/src/app/component/teacher-card/teacher-card.component.ts

@@ -1,34 +1,50 @@
-import { Component, inject, OnInit } from '@angular/core';
-import { FakeHttpService } from '../../data-access/fake-http.service';
+import { NgOptimizedImage } from '@angular/common';
+import { Component, inject } from '@angular/core';
 import { TeacherStore } from '../../data-access/teacher.store';
-import { CardType } from '../../model/card.model';
+import { CardRowDirective } from '../../ui/card/card-row.directive';
 import { CardComponent } from '../../ui/card/card.component';
+import { ListItemComponent } from '../../ui/list-item/list-item.component';
 
 @Component({
   selector: 'app-teacher-card',
   template: `
     <app-card
-      [list]="teachers()"
-      [type]="cardType"
-      customClass="bg-light-red"></app-card>
+      (addNewItem)="onNewItemAdded()"
+      [items]="teachers()"
+      class="bg-light-red">
+      <img ngSrc="assets/img/teacher.png" priority width="200" height="200" />
+
+      <ng-template [cardRow]="teachers()" let-teacher>
+        <app-list-item (delete)="onDelete(teacher.id)">
+          <div>{{ teacher.firstName }}</div>
+        </app-list-item>
+      </ng-template>
+    </app-card>
   `,
   styles: [
     `
-      ::ng-deep .bg-light-red {
+      .bg-light-red {
         background-color: rgba(250, 0, 0, 0.1);
       }
     `,
   ],
-  imports: [CardComponent],
+  imports: [
+    CardComponent,
+    NgOptimizedImage,
+    CardRowDirective,
+    ListItemComponent,
+  ],
+  providers: [TeacherStore],
 })
-export class TeacherCardComponent implements OnInit {
-  private http = inject(FakeHttpService);
+export class TeacherCardComponent {
   private store = inject(TeacherStore);
+  protected readonly teachers = this.store.teachers;
 
-  teachers = this.store.teachers;
-  cardType = CardType.TEACHER;
+  onNewItemAdded() {
+    this.store.addOne();
+  }
 
-  ngOnInit(): void {
-    this.http.fetchTeachers$.subscribe((t) => this.store.addAll(t));
+  onDelete(id: number) {
+    this.store.deleteOne(id);
   }
 }

apps/angular/1-projection/src/app/data-access/city.store.ts

@@ -1,21 +1,27 @@
-import { Injectable, signal } from '@angular/core';
+import { inject, Injectable, signal } from '@angular/core';
+import { toSignal } from '@angular/core/rxjs-interop';
+import { tap } from 'rxjs';
 import { City } from '../model/city.model';
+import { FakeHttpService, randomCity } from './fake-http.service';
 
 @Injectable({
   providedIn: 'root',
 })
 export class CityStore {
-  private cities = signal<City[]>([]);
+  private readonly http = inject(FakeHttpService);
 
-  addAll(cities: City[]) {
-    this.cities.set(cities);
-  }
+  private _cities = signal<City[]>([]);
+  public cities = this._cities.asReadonly();
+
+  fetchCities = toSignal(
+    this.http.fetchCities$.pipe(tap((cities) => this._cities.set(cities))),
+  );
 
-  addOne(student: City) {
-    this.cities.set([...this.cities(), student]);
+  addOne() {
+    this._cities.set([...this._cities(), randomCity()]);
   }
 
   deleteOne(id: number) {
-    this.cities.set(this.cities().filter((s) => s.id !== id));
+    this._cities.set(this._cities().filter((s) => s.id !== id));
   }
 }

apps/angular/1-projection/src/app/data-access/student.store.ts

@@ -1,21 +1,31 @@
-import { Injectable, signal } from '@angular/core';
+import { inject, Injectable, signal } from '@angular/core';
+import { toSignal } from '@angular/core/rxjs-interop';
+import { tap } from 'rxjs';
 import { Student } from '../model/student.model';
+import { FakeHttpService, randStudent } from './fake-http.service';
 
-@Injectable({
-  providedIn: 'root',
-})
+@Injectable()
 export class StudentStore {
-  public students = signal<Student[]>([]);
+  private readonly http = inject(FakeHttpService);
+  private readonly _students = signal<Student[]>([]);
+
+  public readonly students = this._students.asReadonly();
+
+  fetchStudents = toSignal(
+    this.http.fetchStudents$.pipe(
+      tap((students) => this._students.set(students)),
+    ),
+  );
 
   addAll(students: Student[]) {
-    this.students.set(students);
+    this._students.set(students);
   }
 
-  addOne(student: Student) {
-    this.students.set([...this.students(), student]);
+  addOne() {
+    this._students.update((students) => [...students, randStudent()]);
   }
 
   deleteOne(id: number) {
-    this.students.set(this.students().filter((s) => s.id !== id));
+    this._students.set(this._students().filter((s) => s.id !== id));
   }
 }

apps/angular/1-projection/src/app/data-access/teacher.store.ts

@@ -1,21 +1,28 @@
-import { Injectable, signal } from '@angular/core';
+import { inject, Injectable, signal } from '@angular/core';
+import { toSignal } from '@angular/core/rxjs-interop';
+import { tap } from 'rxjs';
 import { Teacher } from '../model/teacher.model';
+import { FakeHttpService, randTeacher } from './fake-http.service';
 
-@Injectable({
-  providedIn: 'root',
-})
+@Injectable()
 export class TeacherStore {
-  public teachers = signal<Teacher[]>([]);
+  private readonly http = inject(FakeHttpService);
+  private readonly _teachers = signal<Teacher[]>([]);
 
-  addAll(teachers: Teacher[]) {
-    this.teachers.set(teachers);
-  }
+  public readonly teachers = this._teachers.asReadonly();
+
+  fetchTeachers = toSignal(
+    this.http.fetchTeachers$.pipe(
+      tap(() => console.log('fetchTeachers')),
+      tap((teachers) => this._teachers.set(teachers)),
+    ),
+  );
 
-  addOne(teacher: Teacher) {
-    this.teachers.set([...this.teachers(), teacher]);
+  addOne() {
+    this._teachers.update((teachers) => [...teachers, randTeacher()]);
   }
 
   deleteOne(id: number) {
-    this.teachers.set(this.teachers().filter((t) => t.id !== id));
+    this._teachers.set(this._teachers().filter((t) => t.id !== id));
   }
 }

apps/angular/1-projection/src/app/ui/card/card-row.directive.ts

@@ -0,0 +1,17 @@
+import { Directive, input } from '@angular/core';
+
+export interface CardRowContext<T> {
+  $implicit: T;
+}
+
+@Directive({ selector: 'ng-template[cardRow]' })
+export class CardRowDirective<T> {
+  public cardRow = input.required<T[]>();
+
+  static ngTemplateContextGuard<T>(
+    dir: CardRowDirective<T>,
+    ctx: any,
+  ): ctx is CardRowContext<T> {
+    return true;
+  }
+}