feat: add Lesson 10 Loader CSV Files

Author: OliviaxJames

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

@@ -2,10 +2,11 @@ import { Module } from '@nestjs/common';
 
 import { AnthonyMaysLoader } from './anthony_mays_loader.js';
 import { DylanLaffertysLoader } from './dylan_lafferty_loaders.js';
+import { OliviaJamesLoader } from './olivia_james_loader.js';
 
 export const Loaders = Symbol.for('Loaders');
 
-const LOADER_PROVIDERS = [AnthonyMaysLoader, DylanLaffertysLoader];
+const LOADER_PROVIDERS = [AnthonyMaysLoader, DylanLaffertysLoader, OliviaJamesLoader];
 
 @Module({
   providers: [

lesson_10/libraries/src/loaders/olivia_james_loader.ts

@@ -0,0 +1,53 @@
+import csv from 'csv-parser';
+import fs from 'fs';
+import { Credit, MediaItem } from '../models/index.js';
+import { Loader } from './loader.js';
+
+
+export class OliviaJamesLoader implements Loader {
+ getLoaderName(): string {
+   return 'oliviajames';
+ }
+
+
+ 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, title, type, year } = row;
+     Media.push(new MediaItem(id, title, type, year, []));
+   }
+   return Media;
+ }
+
+
+ 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;
+ }
+}