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app/Models/Bodega.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsToMany;
+use App\Models\ProductVariant;
+
+class Bodega extends Model
+{
+    use HasFactory;
+
+    /**
+     * The attributes that are mass assignable.
+     *
+     * @var array
+     */
+    protected $fillable = [
+        'nombre',
+    ];
+
+    /**
+     * The attributes that should be cast to native types.
+     *
+     * @var array
+     */
+    protected $casts = [
+        'id' => 'integer',
+    ];
+
+    /**
+     * Relación many‑to‑many con productos.
+     */
+    public function productos(): BelongsToMany
+    {
+        return $this->belongsToMany(Producto::class, 'producto_bodega')
+                    ->withPivot('stock')
+                    ->withTimestamps();
+    }
+
+    /**
+     * Relación many-to-many con variantes.
+     */
+    public function variantes(): BelongsToMany
+    {
+        return $this->belongsToMany(ProductVariant::class, 'variante_bodega', 'bodega_id', 'variante_id')
+                    ->withPivot('stock')
+                    ->withTimestamps();
+    }
+
+    /**
+     * Obtener el stock total de todos los productos en esta bodega.
+     */
+    public function getStockTotalAttribute(): int
+    {
+        return $this->productos()->sum('producto_bodega.stock');
+    }
+
+    /**
+     * Obtener el stock de un producto específico en esta bodega.
+     */
+    public function getStockProducto(int $productoId): int
+    {
+        $producto = $this->productos()->where('producto_id', $productoId)->first();
+        return $producto ? $producto->pivot->stock : 0;
+    }
+}