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app/Models/ProductVariant.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\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\BelongsToMany;
+
+class ProductVariant extends Model
+{
+    use HasFactory;
+
+    /**
+     * The attributes that are mass assignable.
+     *
+     * @var array
+     */
+    protected $fillable = [
+        'producto_id',
+        'color_id',
+        'size_id',
+        'stock',
+        'sku',
+        'barcode'
+    ];
+
+    /**
+     * The attributes that should be cast to native types.
+     *
+     * @var array
+     */
+    protected $casts = [
+        'id' => 'integer',
+    ];
+
+    public function producto(): BelongsTo
+    {
+        return $this->belongsTo(Producto::class);
+    }
+
+    public function color(): BelongsTo
+    {
+        return $this->belongsTo(Color::class);
+    }
+
+    public function size(): BelongsTo
+    {
+        return $this->belongsTo(Size::class);
+    }
+
+    /**
+     * Relación many-to-many con bodegas
+     */
+    public function bodegas(): BelongsToMany
+    {
+        return $this->belongsToMany(Bodega::class, 'variante_bodega', 'variante_id', 'bodega_id')
+                    ->withPivot('stock')
+                    ->withTimestamps();
+    }
+
+    /**
+     * Obtener el stock total de la variante en todas las bodegas
+     */
+    public function getStockTotalBodegas(): int
+    {
+        try {
+            return $this->bodegas()->sum('variante_bodega.stock');
+        } catch (\Exception $e) {
+            // En caso de error, retornar 0
+            return 0;
+        }
+    }
+
+    /**
+     * Obtener el stock efectivo de la variante (considerando bodegas si existen)
+     */
+    public function getStockEfectivo(): int
+    {
+        try {
+            // Si tiene distribución en bodegas, usar ese stock
+            if ($this->bodegas()->exists()) {
+                return $this->getStockTotalBodegas();
+            }
+        } catch (\Exception $e) {
+            // En caso de error (tabla no existe, etc.), usar stock directo
+            // Esto puede ocurrir durante migraciones o configuración inicial
+        }
+        
+        // Stock directo de la variante
+        return $this->stock;
+    }
+}