feat: adds Nile_Jackson_loader.ts and Modifies loader.ts -lesson10Hw (#344)

Author: nilejack

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

@@ -1,11 +1,15 @@
 import { Module } from '@nestjs/common';
 import { AnthonyMaysLoader } from './anthony_mays_loader.js';
+import { NileJacksonLoader } from './nile_jackson_loader.js';
 import { XavierCruzLoader } from './xavier_cruz_loader.js';
-
 export const Loaders = Symbol.for('Loaders');
 
 // Add your quiz provider here.
-const LOADER_PROVIDERS = [AnthonyMaysLoader, XavierCruzLoader];
+const LOADER_PROVIDERS = [
+  AnthonyMaysLoader,
+  XavierCruzLoader,
+  NileJacksonLoader,
+];
 
 @Module({
   providers: [

lesson_10/libraries/src/loaders/nile_jackson_loader.ts

@@ -0,0 +1,44 @@
+import csv from 'csv-parser';
+import fs from 'fs';
+import { Credit, MediaItem } from '../models/index.js';
+import { Loader } from './loader.js';
+
+export class NileJacksonLoader implements Loader {
+  getLoaderName(): string {
+    return 'nilejackson';
+  }
+
+  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 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;
+  }
+}