Merge branch 'code-differently:main' into main

Author: tobyev

lesson_10/libraries/src/loaders/benjamin_scott_loader.ts

@@ -0,0 +1,60 @@
+import csv from 'csv-parser';
+import fs from 'fs';
+import { Credit, MediaItem } from '../models/index.js';
+import { Loader } from './loader.js';
+
+export class BenjaminScottLoader implements Loader {
+  getLoaderName(): string {
+    return 'benjaminscott';
+  }
+
+  async loadData(): Promise<MediaItem[]> {
+    const credits = await this.loadCredits();
+    const mediaItems = await this.loadMediaItems();
+
+    const creditsByMediaId = new Map<string, Credit[]>();
+    for (const credit of credits) {
+      const mediaItemId = credit.getMediaItemId();
+      const mediaCredits = creditsByMediaId.get(mediaItemId) || [];
+      mediaCredits.push(credit);
+      creditsByMediaId.set(mediaItemId, mediaCredits);
+    }
+
+    for (const mediaItem of mediaItems) {
+      const itemCredits = creditsByMediaId.get(mediaItem.getId()) || [];
+      for (const credit of itemCredits) {
+        mediaItem.addCredit(credit);
+      }
+    }
+
+    console.log(
+      `Loaded ${credits.length} credits and ${mediaItems.length} media items`,
+    );
+
+    return [...mediaItems.values()];
+  }
+
+  async loadMediaItems(): Promise<MediaItem[]> {
+    const mediaItems = [];
+    const readable = fs
+      .createReadStream('data/media_items.csv', 'utf-8')
+      .pipe(csv());
+    for await (const row of readable) {
+      const { id, type, title, year } = row;
+      mediaItems.push(new MediaItem(id, title, type, parseInt(year, 10), []));
+    }
+    return mediaItems;
+  }
+
+  async loadCredits(): Promise<Credit[]> {
+    const credits = [];
+    const readable = fs
+      .createReadStream('data/credits.csv', 'utf-8')
+      .pipe(csv());
+    for await (const row of readable) {
+      const { media_item_id, role, name } = row;
+      credits.push(new Credit(media_item_id, name, role));
+    }
+    return credits;
+  }
+}

lesson_10/libraries/src/loaders/loaders.module.ts

@@ -1,11 +1,10 @@
 import { Module } from '@nestjs/common';
 import { AnthonyMaysLoader } from './anthony_mays_loader.js';
+import { BenjaminScottLoader } from './benjamin_scott_loader.js';
 
 export const Loaders = Symbol.for('Loaders');
 
-const LOADER_PROVIDERS = [
-  AnthonyMaysLoader,
-];
+const LOADER_PROVIDERS = [AnthonyMaysLoader, BenjaminScottLoader];
 
 @Module({
   providers: [