Answer: 1

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

@@ -1,9 +1,44 @@
-import { ChangeDetectionStrategy, Component } from '@angular/core';
+import { NgOptimizedImage } from '@angular/common';
+import {
+  ChangeDetectionStrategy,
+  Component,
+  inject,
+  Signal,
+} from '@angular/core';
+import { CityStore } from '../../data-access/city.store';
+import { City } from '../../model/city.model';
+import { CardComponent } from '../../ui/card/card.component';
+import { CardRowDirective } from '../../ui/card/card.directive';
+import { ListItemComponent } from '../../ui/list-item/list-item.component';
 
 @Component({
   selector: 'app-city-card',
-  template: 'TODO City',
-  imports: [],
+  template: `
+    <app-card
+      [items]="cities()"
+      (addNewItem)="cityStore.addOne()"
+      class="bg-light-green">
+      <img ngSrc="assets/img/student.webp" width="200" height="200" />
+
+      <ng-template [cardRow]="cities()" let-city>
+        <app-list-item (delete)="cityStore.deleteOne(city.id)">
+          {{ city.name }}
+        </app-list-item>
+      </ng-template>
+    </app-card>
+  `,
+  imports: [
+    CardComponent,
+    CardRowDirective,
+    ListItemComponent,
+    NgOptimizedImage,
+  ],
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
-export class CityCardComponent {}
+export class CityCardComponent {
+  readonly cityStore = inject(CityStore);
+
+  get cities(): Signal<City[]> {
+    return this.cityStore.$cities;
+  }
+}

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

@@ -1,40 +1,52 @@
+import { NgOptimizedImage } from '@angular/common';
 import {
   ChangeDetectionStrategy,
   Component,
   inject,
-  OnInit,
+  Signal,
 } from '@angular/core';
-import { FakeHttpService } from '../../data-access/fake-http.service';
 import { StudentStore } from '../../data-access/student.store';
-import { CardType } from '../../model/card.model';
+import { Student } from '../../model/student.model';
 import { CardComponent } from '../../ui/card/card.component';
+import { CardRowDirective } from '../../ui/card/card.directive';
+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" />
+      [items]="students()"
+      (addNewItem)="studentStore.addOne()"
+      class="bg-light-green">
+      <img ngSrc="assets/img/student.webp" width="200" height="200" />
+
+      <ng-template [cardRow]="students()" let-student>
+        <app-list-item (delete)="studentStore.deleteOne(student.id)">
+          {{ student.firstName }}
+        </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,
+    CardRowDirective,
+    ListItemComponent,
+    NgOptimizedImage,
+  ],
+  providers: [StudentStore],
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
-export class StudentCardComponent implements OnInit {
-  private http = inject(FakeHttpService);
-  private store = inject(StudentStore);
-
-  students = this.store.students;
-  cardType = CardType.STUDENT;
+export class StudentCardComponent {
+  readonly studentStore = inject(StudentStore);
 
-  ngOnInit(): void {
-    this.http.fetchStudents$.subscribe((s) => this.store.addAll(s));
+  get students(): Signal<Student[]> {
+    return this.studentStore.$students;
   }
 }

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

@@ -1,34 +1,52 @@
-import { Component, inject, OnInit } from '@angular/core';
-import { FakeHttpService } from '../../data-access/fake-http.service';
+import { NgOptimizedImage } from '@angular/common';
+import {
+  ChangeDetectionStrategy,
+  Component,
+  inject,
+  Signal,
+} from '@angular/core';
 import { TeacherStore } from '../../data-access/teacher.store';
-import { CardType } from '../../model/card.model';
+import { Teacher } from '../../model/teacher.model';
 import { CardComponent } from '../../ui/card/card.component';
+import { CardRowDirective } from '../../ui/card/card.directive';
+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>
+      [items]="teacherStore.$teachers()"
+      (addNewItem)="teacherStore.addOne()"
+      class="bg-light-red">
+      <img ngSrc="assets/img/teacher.png" width="200" height="200" />
+
+      <ng-template [cardRow]="teacherStore.$teachers()" let-teacher>
+        <app-list-item (delete)="teacherStore.deleteOne(teacher.id)">
+          {{ teacher.firstName }}
+        </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,
+    CardRowDirective,
+    ListItemComponent,
+    NgOptimizedImage,
+  ],
+  providers: [TeacherStore],
+  changeDetection: ChangeDetectionStrategy.OnPush,
 })
-export class TeacherCardComponent implements OnInit {
-  private http = inject(FakeHttpService);
-  private store = inject(TeacherStore);
-
-  teachers = this.store.teachers;
-  cardType = CardType.TEACHER;
+export class TeacherCardComponent {
+  readonly teacherStore = inject(TeacherStore);
 
-  ngOnInit(): void {
-    this.http.fetchTeachers$.subscribe((t) => this.store.addAll(t));
+  get teachers(): Signal<Teacher[]> {
+    return this.teacherStore.$teachers;
   }
 }

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

@@ -1,21 +1,32 @@
-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 { Store } from '../model/store.model';
+import { FakeHttpService, randomCity } from './fake-http.service';
 
 @Injectable({
   providedIn: 'root',
 })
 export class CityStore {
-  private cities = signal<City[]>([]);
+  private readonly _http = inject(FakeHttpService);
+  private readonly _state: Store<City, '$cities'> = {
+    $cities: signal<City[]>([]),
+  };
 
-  addAll(cities: City[]) {
-    this.cities.set(cities);
-  }
+  $fetchCities = toSignal(
+    this._http.fetchCities$.pipe(
+      tap((t: City[]) => this._state.$cities.set(t)),
+    ),
+  );
+
+  readonly $cities = this._state.$cities.asReadonly();
 
-  addOne(city: City) {
-    this.cities.set([...this.cities(), city]);
+  addOne() {
+    this._state.$cities.update((t: City[]) => [...t, randomCity()]);
   }
 
   deleteOne(id: number) {
-    this.cities.set(this.cities().filter((s) => s.id !== id));
+    this._state.$cities.set(this.$cities().filter((t: City) => t.id !== id));
   }
 }

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

@@ -1,21 +1,34 @@
-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 { Store } from '../model/store.model';
 import { Student } from '../model/student.model';
+import { FakeHttpService, randStudent } from './fake-http.service';
 
 @Injectable({
   providedIn: 'root',
 })
 export class StudentStore {
-  public students = signal<Student[]>([]);
+  private readonly _http = inject(FakeHttpService);
+  private readonly _state: Store<Student, '$students'> = {
+    $students: signal<Student[]>([]),
+  };
 
-  addAll(students: Student[]) {
-    this.students.set(students);
-  }
+  $fetchStudents = toSignal(
+    this._http.fetchStudents$.pipe(
+      tap((t: Student[]) => this._state.$students.set(t)),
+    ),
+  );
+
+  readonly $students = this._state.$students.asReadonly();
 
-  addOne(student: Student) {
-    this.students.set([...this.students(), student]);
+  addOne() {
+    this._state.$students.update((t: Student[]) => [...t, randStudent()]);
   }
 
   deleteOne(id: number) {
-    this.students.set(this.students().filter((s) => s.id !== id));
+    this._state.$students.set(
+      this.$students().filter((t: Student) => t.id !== id),
+    );
   }
 }

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

@@ -1,21 +1,32 @@
-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 { Store } from '../model/store.model';
 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 _state: Store<Teacher, '$teachers'> = {
+    $teachers: signal<Teacher[]>([]),
+  };
 
-  addAll(teachers: Teacher[]) {
-    this.teachers.set(teachers);
-  }
+  $fetchTeachers = toSignal(
+    this._http.fetchTeachers$.pipe(
+      tap((t: Teacher[]) => this._state.$teachers.set(t)),
+    ),
+  );
+
+  readonly $teachers = this._state.$teachers.asReadonly();
 
-  addOne(teacher: Teacher) {
-    this.teachers.set([...this.teachers(), teacher]);
+  addOne() {
+    this._state.$teachers.update((t: Teacher[]) => [...t, randTeacher()]);
   }
 
   deleteOne(id: number) {
-    this.teachers.set(this.teachers().filter((t) => t.id !== id));
+    this._state.$teachers.set(
+      this.$teachers().filter((t: Teacher) => t.id !== id),
+    );
   }
 }

apps/angular/1-projection/src/app/model/store.model.ts

@@ -0,0 +1,5 @@
+import { WritableSignal } from '@angular/core';
+
+export type Store<T, K extends string> = {
+  [key in K]: WritableSignal<T[]>;
+};