intento

app/Models/Product.php

@@ -8,16 +8,7 @@ use Illuminate\Database\Eloquent\Model;
 class Product extends Model
 {
     use HasFactory;
-    protected $fillable = [
-        'codigo',
-        'nombre',
-        'costo',
-        'precio',
-        'stock',
-        'min_stock',
-        'categoria',
-        'descripcion'
-    ];
+    protected $guarded = [];
     public function supplier()
     {
         return $this->belongsTo(Suppliers::class);

app/Models/Sale.php

@@ -3,13 +3,10 @@
 namespace App\Models;
 
 use Illuminate\Database\Eloquent\Model;
-
+use Illuminate\Database\Eloquent\Factories\HasFactory;
 class Sale extends Model
 {
-    use HasFactory;
-    protected $fillable = [
-        'metodo_pago'
-    ];
+    //use HasFactory;
 
     // Permitimos asignación masiva para poder guardar rápido
     protected $guarded = [];

app/Models/SaleDetail.php

@@ -6,7 +6,7 @@ use Illuminate\Database\Eloquent\Model;
 
 class SaleDetail extends Model
 {
-    use HasFactory;
+    //use HasFactory;
     protected $guarded = [];
 
     // este detalle pertenece a una Venta específica