Answer:1 projection

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

@@ -1,9 +1,58 @@
-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 { 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()"
+      (addListItem)="addNewCity()"
+      customClass="bg-light-blue">
+      <img ngSrc="assets/img/city.png" width="200" height="200" />
+      <ng-template #rowRef let-city>
+        <app-list-item [id]="city.id" (deleteItem)="deleteCity(city.id)">
+          {{ city.name }}
+        </app-list-item>
+      </ng-template>
+    </app-card>
+  `,
+  styles: [
+    `
+      ::ng-deep .bg-light-blue {
+        background-color: rgba(0, 0, 250, 0.1);
+      }
+    `,
+  ],
+  imports: [CardComponent, ListItemComponent, NgOptimizedImage],
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
-export class CityCardComponent {}
+export class CityCardComponent implements OnInit {
+  private http = inject(FakeHttpService);
+  private store = inject(CityStore);
+
+  cities = this.store.cities;
+
+  ngOnInit(): void {
+    this.http.fetchCities$.subscribe((t) => this.store.addAll(t));
+  }
+
+  addNewCity() {
+    this.store.addOne(randomCity());
+  }
+
+  deleteCity(id: number) {
+    this.store.deleteOne(id);
+  }
+}

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

@@ -1,21 +1,34 @@
+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 { 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" />
+      (addListItem)="addNewStudent()"
+      customClass="bg-light-green">
+      <img ngSrc="assets/img/student.webp" width="200" height="200" />
+      <ng-template #rowRef let-student>
+        <app-list-item
+          [id]="student.id"
+          (deleteItem)="deleteStudent(student.id)">
+          {{ student.firstName }}
+        </app-list-item>
+      </ng-template>
+    </app-card>
   `,
   styles: [
     `
@@ -24,17 +37,24 @@ import { CardComponent } from '../../ui/card/card.component';
       }
     `,
   ],
-  imports: [CardComponent],
+  imports: [CardComponent, ListItemComponent, NgOptimizedImage],
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
 export class StudentCardComponent implements OnInit {
   private http = inject(FakeHttpService);
   private store = inject(StudentStore);
 
   students = this.store.students;
-  cardType = CardType.STUDENT;
 
   ngOnInit(): void {
     this.http.fetchStudents$.subscribe((s) => this.store.addAll(s));
   }
+
+  addNewStudent() {
+    this.store.addOne(randStudent());
+  }
+
+  deleteStudent(id: number) {
+    this.store.deleteOne(id);
+  }
 }

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

@@ -1,16 +1,29 @@
+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 { 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>
+      (addListItem)="addNewTeacher()"
+      customClass="bg-light-red">
+      <img ngSrc="assets/img/teacher.png" width="200" height="200" />
+      <ng-template #rowRef let-teacher>
+        <app-list-item
+          [id]="teacher.id"
+          (deleteItem)="deleteTeacher(teacher.id)">
+          {{ teacher.firstName }}
+        </app-list-item>
+      </ng-template>
+    </app-card>
   `,
   styles: [
     `
@@ -19,16 +32,23 @@ import { CardComponent } from '../../ui/card/card.component';
       }
     `,
   ],
-  imports: [CardComponent],
+  imports: [CardComponent, ListItemComponent, NgOptimizedImage],
 })
 export class TeacherCardComponent implements OnInit {
   private http = inject(FakeHttpService);
   private store = inject(TeacherStore);
 
   teachers = this.store.teachers;
-  cardType = CardType.TEACHER;
 
   ngOnInit(): void {
     this.http.fetchTeachers$.subscribe((t) => this.store.addAll(t));
   }
+
+  addNewTeacher() {
+    this.store.addOne(randTeacher());
+  }
+
+  deleteTeacher(id: number) {
+    this.store.deleteOne(id);
+  }
 }

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/ui/card/card.component.ts

@@ -1,30 +1,24 @@
-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 { CommonModule } from '@angular/common';
+import {
+  Component,
+  ContentChild,
+  input,
+  output,
+  TemplateRef,
+} from '@angular/core';
 
 @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="img"></ng-content>
       <section>
         @for (item of list(); track item) {
-          <app-list-item
-            [name]="item.firstName"
-            [id]="item.id"
-            [type]="type()"></app-list-item>
+          <ng-container
+            [ngTemplateOutlet]="rowTemplate"
+            [ngTemplateOutletContext]="{ $implicit: item }"></ng-container>
         }
       </section>
 
@@ -35,24 +29,17 @@ import { ListItemComponent } from '../list-item/list-item.component';
       </button>
     </div>
   `,
-  imports: [ListItemComponent, NgOptimizedImage],
+  imports: [CommonModule],
 })
-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[] | null>(null);
   readonly customClass = input('');
+  readonly addListItem = output();
 
-  CardType = CardType;
+  @ContentChild('rowRef', { read: TemplateRef })
+  rowTemplate!: TemplateRef<{ $implicit: T }>;
 
   addNewItem() {
-    const type = this.type();
-    if (type === CardType.TEACHER) {
-      this.teacherStore.addOne(randTeacher());
-    } else if (type === CardType.STUDENT) {
-      this.studentStore.addOne(randStudent());
-    }
+    this.addListItem.emit();
   }
 }

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

@@ -1,18 +1,15 @@
 import {
   ChangeDetectionStrategy,
   Component,
-  inject,
   input,
+  output,
 } from '@angular/core';
-import { StudentStore } from '../../data-access/student.store';
-import { TeacherStore } from '../../data-access/teacher.store';
-import { CardType } from '../../model/card.model';
 
 @Component({
   selector: 'app-list-item',
   template: `
     <div class="border-grey-300 flex justify-between border px-2 py-1">
-      {{ name() }}
+      <ng-content></ng-content>
       <button (click)="delete(id())">
         <img class="h-5" src="assets/svg/trash.svg" />
       </button>
@@ -22,19 +19,10 @@ import { CardType } from '../../model/card.model';
   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>();
+  readonly deleteItem = output<number>();
 
   delete(id: number) {
-    const type = this.type();
-    if (type === CardType.TEACHER) {
-      this.teacherStore.deleteOne(id);
-    } else if (type === CardType.STUDENT) {
-      this.studentStore.deleteOne(id);
-    }
+    this.deleteItem.emit(id);
   }
 }