feat: add sub category

app/Models/MusicCategory.php

@@ -22,7 +22,22 @@ public function playlists(): HasMany
     {
         return $this->hasMany(MusicPlaylist::class, 'category_id');
     }
-    
+
+    public function subcategories(): HasMany
+    {
+        return $this->hasMany(MusicSubcategory::class, 'category_id');
+    }
+       // All playlists (including those in subcategories)
+    public function allPlaylists()
+    {
+        $playlists = collect($this->playlists);
+        
+        foreach ($this->subcategories as $subcategory) {
+            $playlists = $playlists->merge($subcategory->playlists);
+        }
+        
+        return $playlists;
+    }
     public function image(): BelongsTo
     {
         return $this->belongsTo(Image::class);
@@ -32,4 +47,18 @@ public function getActivePlaylistsAttribute()
     {
         return $this->playlists()->where('is_active', true)->get();
     }
+
+      // Total music count across all playlists and subcategories
+    public function getTotalMusicCountAttribute()
+    {
+        $count = $this->playlists->sum(function($playlist) {
+            return $playlist->musics->count();
+        });
+        
+        foreach ($this->subcategories as $subcategory) {
+            $count += $subcategory->total_music_count;
+        }
+        
+        return $count;
+    }
 }