feat(doc): move pipe bug

apps/rxjs/pipe-bug/src/app/app.component.ts

@@ -0,0 +1,56 @@
+/* eslint-disable @angular-eslint/component-selector */
+import { AsyncPipe, NgFor } from '@angular/common';
+import { Component, inject, Input } from '@angular/core';
+import { BehaviorSubject, take } from 'rxjs';
+import { AppService } from './app.service';
+import { TopicType } from './localDB.service';
+
+@Component({
+  standalone: true,
+  selector: 'button-delete-topic',
+  imports: [AsyncPipe],
+  template: `
+    <button (click)="deleteTopic()"><ng-content></ng-content></button>
+    <div>{{ message$$ | async }}</div>
+  `,
+})
+export class ButtonDeleteComponent {
+  @Input() topic!: TopicType;
+
+  message$$ = new BehaviorSubject<string>('');
+
+  private service = inject(AppService);
+
+  deleteTopic() {
+    this.service
+      .deleteOldTopics(this.topic)
+      .pipe(take(1))
+      .subscribe((result) =>
+        this.message$$.next(
+          result
+            ? `All ${this.topic} have been deleted`
+            : `Error: deletion of some ${this.topic} failed`
+        )
+      );
+  }
+}
+
+@Component({
+  standalone: true,
+  imports: [AsyncPipe, NgFor, ButtonDeleteComponent],
+  selector: 'app-root',
+  template: `
+    <div *ngFor="let item of all$ | async">
+      {{ item.id }} - {{ item.topic }}
+    </div>
+
+    <button-delete-topic topic="food">Delete Food</button-delete-topic>
+    <button-delete-topic topic="sport">Delete Sport</button-delete-topic>
+    <button-delete-topic topic="book">Delete Book</button-delete-topic>
+  `,
+})
+export class AppComponent {
+  private service = inject(AppService);
+
+  all$ = this.service.getAll$;
+}

apps/rxjs/pipe-bug/src/app/app.service.ts

@@ -0,0 +1,23 @@
+import { inject, Injectable } from '@angular/core';
+import { merge, mergeMap, Observable, of, take } from 'rxjs';
+import { LocalDBService, TopicType } from './localDB.service';
+
+@Injectable({ providedIn: 'root' })
+export class AppService {
+  private dbService = inject(LocalDBService);
+
+  getAll$ = this.dbService.infos$;
+
+  deleteOldTopics(type: TopicType): Observable<boolean> {
+    return this.dbService.searchByType(type).pipe(
+      take(1),
+      mergeMap((topicToDelete) =>
+        topicToDelete.length > 0
+          ? topicToDelete
+              .map((t) => this.dbService.deleteOneTopic(t.id))
+              .reduce((acc, curr) => merge(acc, curr), of(true))
+          : of(true)
+      )
+    );
+  }
+}

apps/rxjs/pipe-bug/src/app/localDB.service.ts

@@ -0,0 +1,58 @@
+/* eslint-disable @typescript-eslint/member-ordering */
+import { randomError } from '@angular-challenges/shared/utils';
+import { Injectable } from '@angular/core';
+import { ComponentStore } from '@ngrx/component-store';
+import { of } from 'rxjs';
+
+export type TopicType = 'food' | 'book' | 'sport';
+
+interface Info {
+  id: number;
+  topic: TopicType;
+}
+
+interface DBState {
+  infos: Info[];
+}
+
+const initialState: DBState = {
+  infos: [
+    { id: 1, topic: 'book' },
+    { id: 2, topic: 'book' },
+    { id: 3, topic: 'book' },
+    { id: 4, topic: 'book' },
+    { id: 5, topic: 'food' },
+    { id: 6, topic: 'food' },
+    { id: 7, topic: 'book' },
+    { id: 8, topic: 'book' },
+    { id: 9, topic: 'book' },
+    { id: 10, topic: 'sport' },
+  ],
+};
+
+@Injectable({ providedIn: 'root' })
+export class LocalDBService extends ComponentStore<DBState> {
+  constructor() {
+    super(initialState);
+  }
+
+  infos$ = this.select((state) => state.infos);
+
+  searchByType = (type: TopicType) =>
+    this.select((state) => state.infos.filter((i) => i.topic === type));
+
+  deleteOne = this.updater(
+    (state, id: number): DBState => ({
+      infos: state.infos.filter((i) => i.id !== id),
+    })
+  );
+
+  deleteOneTopic = (id: number) =>
+    randomError({
+      success: () => {
+        this.deleteOne(id);
+        return of(true);
+      },
+      error: () => of(false),
+    });
+}