Answer:1 content projection solution

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

@@ -1,9 +1,48 @@
-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 { randomCity } from '../../data-access/fake-http.service';
+import { CardType } from '../../model/card.model';
+import { City } from '../../model/city.model';
+import { CardItemDirective } from '../../ui/card/card-item-context.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 [list]="cities.value()" (onAddNewItem)="addNewCity()">
+      <img ngSrc="assets/img/city.png" width="200" height="200" />
+
+      <ng-template [appCardItem]="_cityType" #itemTemplate let-item>
+        <app-list-item
+          [name]="item.name"
+          [id]="item.id"
+          [type]="cardType"
+          (onDeleteItem)="deleteCity(item.id)"></app-list-item>
+      </ng-template>
+    </app-card>
+  `,
+  imports: [
+    CardComponent,
+    NgOptimizedImage,
+    ListItemComponent,
+    CardItemDirective,
+  ],
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
-export class CityCardComponent {}
+export class CityCardComponent {
+  private store = inject(CityStore);
+  readonly _cityType!: City;
+
+  cities = this.store.cities;
+  cardType = CardType.CITY;
+
+  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

@@ -1,40 +1,58 @@
-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 { randStudent } 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 { CardItemDirective } from '../../ui/card/card-item-context.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" />
+      [list]="students.value()"
+      class="bg-light-green"
+      (onAddNewItem)="addNewItem()">
+      <img ngSrc="assets/img/student.webp" width="200" height="200" />
+
+      <ng-template [appCardItem]="_studentType" #itemTemplate let-item>
+        <app-list-item
+          [name]="item.firstName"
+          [id]="item.id"
+          [type]="cardType"
+          (onDeleteItem)="deleteStudent(item.id)"></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,
+    ListItemComponent,
+    CardItemDirective,
+  ],
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
-export class StudentCardComponent implements OnInit {
-  private http = inject(FakeHttpService);
+export class StudentCardComponent {
   private store = inject(StudentStore);
+  readonly _studentType!: Student;
 
   students = this.store.students;
   cardType = CardType.STUDENT;
 
-  ngOnInit(): void {
-    this.http.fetchStudents$.subscribe((s) => this.store.addAll(s));
+  addNewItem() {
+    this.store.addOne(randStudent());
+  }
+
+  deleteStudent(id: number) {
+    this.store.deleteOne(id);
   }
 }

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

@@ -1,34 +1,58 @@
-import { 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 { randTeacher } from '../../data-access/fake-http.service';
 import { TeacherStore } from '../../data-access/teacher.store';
 import { CardType } from '../../model/card.model';
+import { Teacher } from '../../model/teacher.model';
+import { CardItemDirective } from '../../ui/card/card-item-context.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>
+      [list]="teachers.value()"
+      class="bg-light-red"
+      (onAddNewItem)="addNewTeacher()">
+      <img priority ngSrc="assets/img/teacher.png" width="200" height="200" />
+
+      <ng-template [appCardItem]="_teacherType" #itemTemplate let-item>
+        <app-list-item
+          [name]="item.firstName"
+          [id]="item.id"
+          [type]="cardType"
+          (onDeleteItem)="deleteTeacher(item.id)"></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,
+    ListItemComponent,
+    CardItemDirective,
+  ],
+  changeDetection: ChangeDetectionStrategy.OnPush,
 })
-export class TeacherCardComponent implements OnInit {
-  private http = inject(FakeHttpService);
+export class TeacherCardComponent {
   private store = inject(TeacherStore);
+  readonly _teacherType!: Teacher;
 
   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

@@ -1,21 +1,28 @@
-import { Injectable, signal } from '@angular/core';
+import { inject, Injectable } from '@angular/core';
+import { rxResource } from '@angular/core/rxjs-interop';
 import { City } from '../model/city.model';
+import { FakeHttpService } from './fake-http.service';
 
 @Injectable({
   providedIn: 'root',
 })
 export class CityStore {
-  private cities = signal<City[]>([]);
+  http = inject(FakeHttpService);
+
+  cities = rxResource({
+    stream: () => this.http.fetchCities$,
+    defaultValue: [],
+  });
 
   addAll(cities: City[]) {
     this.cities.set(cities);
   }
 
   addOne(city: City) {
-    this.cities.set([...this.cities(), city]);
+    this.cities.set([...this.cities.value(), city]);
   }
 
   deleteOne(id: number) {
-    this.cities.set(this.cities().filter((s) => s.id !== id));
+    this.cities.set(this.cities.value().filter((s) => s.id !== id));
   }
 }

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

@@ -1,21 +1,28 @@
-import { Injectable, signal } from '@angular/core';
+import { inject, Injectable } from '@angular/core';
+import { rxResource } from '@angular/core/rxjs-interop';
 import { Student } from '../model/student.model';
+import { FakeHttpService } from './fake-http.service';
 
 @Injectable({
   providedIn: 'root',
 })
 export class StudentStore {
-  public students = signal<Student[]>([]);
+  http = inject(FakeHttpService);
+
+  students = rxResource({
+    stream: () => this.http.fetchStudents$,
+    defaultValue: [],
+  });
 
   addAll(students: Student[]) {
     this.students.set(students);
   }
 
   addOne(student: Student) {
-    this.students.set([...this.students(), student]);
+    this.students.set([...this.students.value(), student]);
   }
 
   deleteOne(id: number) {
-    this.students.set(this.students().filter((s) => s.id !== id));
+    this.students.set(this.students.value().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 } from '@angular/core';
+import { rxResource } from '@angular/core/rxjs-interop';
 import { Teacher } from '../model/teacher.model';
+import { FakeHttpService } from './fake-http.service';
 
 @Injectable({
   providedIn: 'root',
 })
 export class TeacherStore {
-  public teachers = signal<Teacher[]>([]);
+  http = inject(FakeHttpService);
+
+  teachers = rxResource({
+    stream: () => this.http.fetchTeachers$,
+    defaultValue: [],
+  });
 
   addAll(teachers: Teacher[]) {
     this.teachers.set(teachers);
   }
 
   addOne(teacher: Teacher) {
-    this.teachers.set([...this.teachers(), teacher]);
+    this.teachers.set([...this.teachers.value(), teacher]);
   }
 
   deleteOne(id: number) {
-    this.teachers.set(this.teachers().filter((t) => t.id !== id));
+    this.teachers.set(this.teachers.value().filter((t) => t.id !== id));
   }
 }

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

@@ -0,0 +1,23 @@
+import { Directive, inject, input, TemplateRef } from '@angular/core';
+
+export interface CardItemContext<T> {
+  $implicit: T;
+}
+
+@Directive({
+  selector: 'ng-template[appCardItem]',
+  exportAs: 'appCardItem',
+  standalone: true,
+})
+export class CardItemDirective<T> {
+  readonly appCardItem = input<T>();
+
+  tpl = inject(TemplateRef<CardItemContext<T>>);
+
+  static ngTemplateContextGuard<T>(
+    _dir: CardItemDirective<T>,
+    _ctx: unknown,
+  ): _ctx is CardItemContext<T> {
+    return true;
+  }
+}