feat: add Meiko lesson 10

Author: Meiko-S22

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 { MeikoStephensLoader } from './meiko_stephens_loader.js';
 
 export const Loaders = Symbol.for('Loaders');
 
-const LOADER_PROVIDERS = [AnthonyMaysLoader];
+const LOADER_PROVIDERS = [AnthonyMaysLoader,MeikoStephensLoader];
 
 @Module({
   providers: [

lesson_10/libraries/src/loaders/meiko_stephens_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 MeikoStephensLoader implements Loader {
+  getLoaderName(): string {
+    return 'meikostephens';
+  }
+
+  async loadData(): Promise<MediaItem[]> {
+    const credits = await this.loadCredits();
+    const mediaItems = await this.loadMediaItems();
+  const mediaMap = new Map<string, MediaItem>();
+           mediaItems.forEach((mediaItem) => {
+      mediaMap.set(mediaItem.getId(), mediaItem);
+    });
+ 
+
+    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;
+  }
+}