feat: adding Dasias loader file to lesson_10

lesson_10/libraries/src/loaders/dasia_english_loader.ts

@@ -0,0 +1,49 @@
+import csv from 'csv-parser';
+import fs from 'fs';
+
+import { Credit, MediaItem } from '../models/index.js';
+import { Loader } from './loader.js';
+
+export class DasiaEnglishLoader implements Loader {
+  getLoaderName(): string {
+    return 'dasiaenglish';
+  }
+
+  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`,
+    );
+
+    return [...mediaItems.values()];
+  }
+
+  async loadMediaItems(): Promise<MediaItem[]> {
+    const media = [];
+    const readable = fs
+      .createReadStream('data/media_items.csv', 'utf-8')
+      .pipe(csv());
+    for await (const row of readable) {
+      const { id, type, title, year } = row;
+      media.push(new MediaItem(id, title, type, year, []));
+    }
+    return media;
+
+    // I used this youtube video to help me understand the above code: https://www.youtube.com/watch?v=bbvECy0ICuo
+    // I also got help from Lj on getting my test to run correctly
+  }
+
+  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: mediaItemId, role, name } = row;
+      credits.push(new Credit(mediaItemId, name, role));
+    }
+    return credits;
+  }
+}

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

@@ -1,10 +1,11 @@
 import { Module } from '@nestjs/common';
 import { AnthonyMaysLoader } from './anthony_mays_loader.js';
+import { DasiaEnglishLoader } from './dasia_english_loader.js';
 
 export const Loaders = Symbol.for('Loaders');
 
 // Add your quiz provider here.
-const LOADER_PROVIDERS = [AnthonyMaysLoader];
+const LOADER_PROVIDERS = [AnthonyMaysLoader, DasiaEnglishLoader];
 
 @Module({
   providers: [