align resolvers with database schema

server/src/graphQL/resolvers.ts

@@ -5,40 +5,42 @@ export const resolvers = {
     albums: async (_: unknown, args: { search?: string; genre?: string; decade?: number; first?: number }) => {
       let sql = `
         SELECT 
-          id, 
-          title, 
-          artist, 
-          release_year AS "releaseYear", 
-          genre, 
-          cover_url AS "coverUrl"
-        FROM albums
+          a.id, 
+          a.title, 
+          a.artist, 
+          a.release_year AS "releaseYear", 
+          g.name AS genre, 
+          a.cover_url AS "coverUrl"
+        FROM albums a
+        LEFT JOIN album_genres ag ON ag.album_id = a.id
+        LEFT JOIN genres g ON g.id = ag.genre_id
         WHERE 1=1
       `;
       const queryParams: (string | number)[] = [];
 
 
       if (args.search) {
         queryParams.push(`%${args.search}%`);
-        sql += ` AND (LOWER(title) LIKE LOWER($${queryParams.length}) OR LOWER(artist) LIKE LOWER($${queryParams.length}))`;
+        sql += ` AND (LOWER(a.title) LIKE LOWER($${queryParams.length}) OR LOWER(a.artist) LIKE LOWER($${queryParams.length}))`;
       }
 
 
       if (args.genre) {
         queryParams.push(args.genre);
-        sql += ` AND LOWER(genre) = LOWER($${queryParams.length})`;
+        sql += ` AND LOWER(g.name) = LOWER($${queryParams.length})`;
       }
 
 
       if (args.decade) {
         queryParams.push(args.decade);
-        sql += ` AND release_year >= $${queryParams.length} AND release_year < $${queryParams.length} + 10`;
+        sql += ` AND a.release_year >= $${queryParams.length} AND a.release_year < $${queryParams.length} + 10`;
       }
 
       const limit = args.first || 10;
 
 
       queryParams.push(limit + 1);
-      sql += ` ORDER BY title ASC LIMIT $${queryParams.length}`;
+      sql += ` ORDER BY a.title ASC LIMIT $${queryParams.length}`;
 
       const { rows } = await pool.query(sql, queryParams);
 
@@ -57,14 +59,16 @@ export const resolvers = {
     album: async (_: unknown, args: { id: string }) => {
       const albumSql = `
         SELECT 
-          id, 
-          title, 
-          artist, 
-          release_year AS "releaseYear", 
-          genre, 
-          cover_url AS "coverUrl"
-        FROM albums
-        WHERE id = $1
+          a.id, 
+          a.title, 
+          a.artist, 
+          a.release_year AS "releaseYear", 
+          g.name AS genre, 
+          a.cover_path AS "coverUrl"
+        FROM albums a
+        LEFT JOIN album_genres ag ON ag.album_id = a.id
+        LEFT JOIN genres g ON g.id = ag.genre_id
+        WHERE a.id = $1
       `;
       const { rows: albumRows } = await pool.query(albumSql, [args.id]);
 
@@ -79,7 +83,7 @@ export const resolvers = {
         SELECT 
           id, 
           title, 
-          duration 
+          duration_ms AS "duration" 
         FROM tracks 
         WHERE album_id = $1
         ORDER BY track_number ASC