Answer:1 Projection

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

@@ -1,9 +1,76 @@
-import { ChangeDetectionStrategy, Component } from '@angular/core';
+import { NgOptimizedImage } from '@angular/common';
+import {
+  ChangeDetectionStrategy,
+  Component,
+  inject,
+  OnInit,
+} from '@angular/core';
+import { CityStore } from '../../data-access/city.store';
+import {
+  FakeHttpService,
+  randomCity,
+} from '../../data-access/fake-http.service';
+import { OptionTemplateDirective } from '../../directive/option-template.directive';
+import { CardType } from '../../model/card.model';
+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 [list]="cities()" [customClass]="'bg-light-yellow'">
+      <img
+        ngProjectAs="card-image"
+        ngSrc="assets/img/city.png"
+        width="200"
+        height="200" />
+      <ng-template appOptionTemplate let-city>
+        <app-list-item>
+          <ng-container ngProjectAs="item-name">{{ city.name }}</ng-container>
+          <button ngProjectAs="item-action" (click)="delete(city.id)">
+            <img class="h-5" src="assets/svg/trash.svg" />
+          </button>
+        </app-list-item>
+      </ng-template>
+      <button
+        ngProjectAs="card-action"
+        class="rounded-sm border border-blue-500 bg-blue-300 p-2"
+        (click)="addNewItem()">
+        Add
+      </button>
+    </app-card>
+  `,
+  styles: [
+    `
+      ::ng-deep .bg-light-yellow {
+        background-color: rgba(218, 255, 108, 0.6);
+      }
+    `,
+  ],
+  imports: [
+    ListItemComponent,
+    CardComponent,
+    NgOptimizedImage,
+    OptionTemplateDirective,
+  ],
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
-export class CityCardComponent {}
+export class CityCardComponent implements OnInit {
+  private http = inject(FakeHttpService);
+  private store = inject(CityStore);
+
+  cities = this.store.cities;
+  cardType = CardType.CITY;
+
+  ngOnInit(): void {
+    this.http.fetchCities$.subscribe((s) => this.store.addAll(s));
+  }
+
+  delete(id: number) {
+    this.store.deleteOne(id);
+  }
+
+  addNewItem() {
+    this.store.addOne(randomCity());
+  }
+}

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

@@ -1,21 +1,46 @@
+import { NgOptimizedImage } from '@angular/common';
 import {
   ChangeDetectionStrategy,
   Component,
   inject,
   OnInit,
 } from '@angular/core';
-import { FakeHttpService } from '../../data-access/fake-http.service';
+import {
+  FakeHttpService,
+  randStudent,
+} from '../../data-access/fake-http.service';
 import { StudentStore } from '../../data-access/student.store';
+import { OptionTemplateDirective } from '../../directive/option-template.directive';
 import { CardType } from '../../model/card.model';
 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" />
+    <app-card [list]="students()" [customClass]="'bg-light-green'">
+      <img
+        ngProjectAs="card-image"
+        ngSrc="assets/img/student.webp"
+        width="200"
+        height="200" />
+      <ng-template appOptionTemplate let-student>
+        <app-list-item>
+          <ng-container ngProjectAs="item-name">
+            {{ student.firstName }}
+          </ng-container>
+          <button ngProjectAs="item-action" (click)="delete(student.id)">
+            <img class="h-5" src="assets/svg/trash.svg" />
+          </button>
+        </app-list-item>
+      </ng-template>
+      <button
+        ngProjectAs="card-action"
+        class="rounded-sm border border-blue-500 bg-blue-300 p-2"
+        (click)="addNewItem()">
+        Add
+      </button>
+    </app-card>
   `,
   styles: [
     `
@@ -24,7 +49,12 @@ import { CardComponent } from '../../ui/card/card.component';
       }
     `,
   ],
-  imports: [CardComponent],
+  imports: [
+    CardComponent,
+    NgOptimizedImage,
+    ListItemComponent,
+    OptionTemplateDirective,
+  ],
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
 export class StudentCardComponent implements OnInit {
@@ -37,4 +67,12 @@ export class StudentCardComponent implements OnInit {
   ngOnInit(): void {
     this.http.fetchStudents$.subscribe((s) => this.store.addAll(s));
   }
+
+  delete(id: number) {
+    this.store.deleteOne(id);
+  }
+
+  addNewItem() {
+    this.store.addOne(randStudent());
+  }
 }

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

@@ -1,25 +1,55 @@
+import { NgOptimizedImage } from '@angular/common';
 import { Component, inject, OnInit } from '@angular/core';
-import { FakeHttpService } from '../../data-access/fake-http.service';
+import {
+  FakeHttpService,
+  randTeacher,
+} from '../../data-access/fake-http.service';
 import { TeacherStore } from '../../data-access/teacher.store';
+import { OptionTemplateDirective } from '../../directive/option-template.directive';
 import { CardType } from '../../model/card.model';
 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>
+    <app-card [list]="teachers()" [customClass]="'bg-light-red'">
+      <img
+        ngProjectAs="card-image"
+        ngSrc="assets/img/teacher.png"
+        width="200"
+        height="200" />
+      <ng-template appOptionTemplate let-teacher>
+        <app-list-item>
+          <ng-container ngProjectAs="item-name">
+            {{ teacher.firstName }}
+          </ng-container>
+          <button ngProjectAs="item-action" (click)="delete(teacher.id)">
+            <img class="h-5" src="assets/svg/trash.svg" />
+          </button>
+        </app-list-item>
+      </ng-template>
+      <button
+        ngProjectAs="card-action"
+        class="rounded-sm border border-blue-500 bg-blue-300 p-2"
+        (click)="addNewItem()">
+        Add
+      </button>
+    </app-card>
   `,
   styles: [
     `
-      ::ng-deep .bg-light-red {
+      :host .bg-light-red {
         background-color: rgba(250, 0, 0, 0.1);
       }
     `,
   ],
-  imports: [CardComponent],
+  imports: [
+    CardComponent,
+    ListItemComponent,
+    NgOptimizedImage,
+    OptionTemplateDirective,
+  ],
 })
 export class TeacherCardComponent implements OnInit {
   private http = inject(FakeHttpService);
@@ -31,4 +61,12 @@ export class TeacherCardComponent implements OnInit {
   ngOnInit(): void {
     this.http.fetchTeachers$.subscribe((t) => this.store.addAll(t));
   }
+
+  delete(id: number) {
+    this.store.deleteOne(id);
+  }
+
+  addNewItem() {
+    this.store.addOne(randTeacher());
+  }
 }

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

@@ -5,7 +5,7 @@ import { City } from '../model/city.model';
   providedIn: 'root',
 })
 export class CityStore {
-  private cities = signal<City[]>([]);
+  public cities = signal<City[]>([]);
 
   addAll(cities: City[]) {
     this.cities.set(cities);

apps/angular/1-projection/src/app/directive/option-template.directive.spec.ts

@@ -0,0 +1,8 @@
+import { OptionTemplateDirective } from './option-template.directive';
+
+describe('OptionTemplateDirective', () => {
+  it('should create an instance', () => {
+    const directive = new OptionTemplateDirective();
+    expect(directive).toBeTruthy();
+  });
+});

apps/angular/1-projection/src/app/directive/option-template.directive.ts

@@ -0,0 +1,9 @@
+import { Directive } from '@angular/core';
+
+@Directive({
+  selector: '[appOptionTemplate]',
+  exportAs: 'appOptionTemplate',
+})
+export class OptionTemplateDirective {
+  constructor() {}
+}

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

@@ -1,58 +1,33 @@
-import { NgOptimizedImage } from '@angular/common';
-import { Component, inject, input } from '@angular/core';
-import { randStudent, randTeacher } from '../../data-access/fake-http.service';
-import { StudentStore } from '../../data-access/student.store';
-import { TeacherStore } from '../../data-access/teacher.store';
-import { CardType } from '../../model/card.model';
-import { ListItemComponent } from '../list-item/list-item.component';
+import { NgTemplateOutlet } from '@angular/common';
+import { Component, contentChild, input, TemplateRef } from '@angular/core';
+import { OptionTemplateDirective } from '../../directive/option-template.directive';
 
 @Component({
   selector: 'app-card',
   template: `
     <div
       class="flex w-fit flex-col gap-3 rounded-md border-2 border-black p-4"
       [class]="customClass()">
-      @if (type() === CardType.TEACHER) {
-        <img ngSrc="assets/img/teacher.png" width="200" height="200" />
-      }
-      @if (type() === CardType.STUDENT) {
-        <img ngSrc="assets/img/student.webp" width="200" height="200" />
-      }
-
+      <ng-content select="card-image"></ng-content>
       <section>
-        @for (item of list(); track item) {
-          <app-list-item
-            [name]="item.firstName"
-            [id]="item.id"
-            [type]="type()"></app-list-item>
+        @for (item of list(); let i = $index; track i) {
+          <ng-container
+            [ngTemplateOutlet]="optionTemplateRef()"
+            [ngTemplateOutletContext]="{
+              $implicit: item,
+              index: i
+            }"></ng-container>
         }
       </section>
-
-      <button
-        class="rounded-sm border border-blue-500 bg-blue-300 p-2"
-        (click)="addNewItem()">
-        Add
-      </button>
+      <ng-content select="card-action"></ng-content>
     </div>
   `,
-  imports: [ListItemComponent, NgOptimizedImage],
+  imports: [NgTemplateOutlet],
 })
-export class CardComponent {
-  private teacherStore = inject(TeacherStore);
-  private studentStore = inject(StudentStore);
-
-  readonly list = input<any[] | null>(null);
-  readonly type = input.required<CardType>();
+export class CardComponent<T> {
+  readonly list = input<T[]>();
   readonly customClass = input('');
-
-  CardType = CardType;
-
-  addNewItem() {
-    const type = this.type();
-    if (type === CardType.TEACHER) {
-      this.teacherStore.addOne(randTeacher());
-    } else if (type === CardType.STUDENT) {
-      this.studentStore.addOne(randStudent());
-    }
-  }
+  readonly optionTemplateRef = contentChild(OptionTemplateDirective, {
+    read: TemplateRef,
+  });
 }

apps/angular/1-projection/src/app/ui/list-item/list-item.component.ts

@@ -1,39 +1,13 @@
-import {
-  ChangeDetectionStrategy,
-  Component,
-  inject,
-  input,
-} from '@angular/core';
-import { StudentStore } from '../../data-access/student.store';
-import { TeacherStore } from '../../data-access/teacher.store';
-import { CardType } from '../../model/card.model';
+import { ChangeDetectionStrategy, Component } from '@angular/core';
 
 @Component({
   selector: 'app-list-item',
   template: `
     <div class="border-grey-300 flex justify-between border px-2 py-1">
-      {{ name() }}
-      <button (click)="delete(id())">
-        <img class="h-5" src="assets/svg/trash.svg" />
-      </button>
+      <ng-content select="item-name"></ng-content>
+      <ng-content select="item-action"></ng-content>
     </div>
   `,
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
-export class ListItemComponent {
-  private teacherStore = inject(TeacherStore);
-  private studentStore = inject(StudentStore);
-
-  readonly id = input.required<number>();
-  readonly name = input.required<string>();
-  readonly type = input.required<CardType>();
-
-  delete(id: number) {
-    const type = this.type();
-    if (type === CardType.TEACHER) {
-      this.teacherStore.deleteOne(id);
-    } else if (type === CardType.STUDENT) {
-      this.studentStore.deleteOne(id);
-    }
-  }
-}
+export class ListItemComponent {}