feat Saunders modified loader files implementing MediaItem

lesson_10/libraries/src/loaders/khayla_saunders_loader.ts

@@ -0,0 +1,56 @@
+import csv from 'csv-parser';
+import fs from 'fs';
+import { Credit, MediaItem } from '../models/index.js';
+import { Loader } from './loader.js';
+
+export class KhaylaSaundersLoader implements Loader {
+  getLoaderName(): string {
+    return 'khaylasaunders';
+  }
+
+  async loadData(): Promise<MediaItem[]> {
+    const credits = await this.loadCredits();
+    const mediaItems = await this.loadMediaItems();
+
+    console.log(
+      `Loaded ${credits.length} credits and ${mediaItems.length} media items`,
+    );
+    //Extra credit was generated with the assistance of chatGPT
+    const creditsMap: Record<string, Credit[]> = {};
+
+    for (const credit of credits) {
+      const mediaItemId = credit.getMediaItemId();
+      if (!creditsMap[mediaItemId]) {
+        creditsMap[mediaItemId] = [];
+      }
+      creditsMap[mediaItemId].push(credit);
+    }
+
+    return [...mediaItems.values()];
+  }
+
+  async loadMediaItems(): Promise<MediaItem[]> {
+    // TODO: Implement this method.
+    const mediaItems = [];
+    const readable = fs
+      .createReadStream('data/media_items.csv', 'utf-8')
+      .pipe(csv());
+    for await (const row of readable) {
+      const { id, title, type, year } = row;
+      mediaItems.push(new MediaItem(id, title, type, year, []));
+    }
+    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

@@ -1,6 +1,12 @@
 import { Module } from '@nestjs/common';
 
 import { AnthonyMaysLoader } from './anthony_mays_loader.js';
+lesson10
+import { KhaylaSaundersLoader } from './khayla_saunders_loader.js';
+
+export const Loaders = Symbol.for('Loaders');
+
+const LOADER_PROVIDERS = [AnthonyMaysLoader, KhaylaSaundersLoader];
 import { DylanLaffertysLoader } from './dylan_lafferty_loaders.js';
 import { MercedesMathewsLoader } from './mercedes_mathews_loader.js';
 
@@ -11,6 +17,7 @@ const LOADER_PROVIDERS = [
   DylanLaffertysLoader,
   MercedesMathewsLoader,
 ];
+main
 
 @Module({
   providers: [