Запись в ManyToMany

class Product(models.Model):
    class Meta:
        db_table = "Product"
 
    product_id = models.AutoField(primary_key=True)
    name = models.CharField(null=False, max_length=30)
    price = models.PositiveIntegerField(null=False)
    description = models.TextField(null=False)
    category_id = models.ForeignKey(Category, on_delete=models.DO_NOTHING)
    image = models.URLField(default='https://imgholder.ru/600x300/8493a8/adb9ca&text=IMAGE+HOLDER&font=kelson')
 
class Order(models.Model):
    class Meta:
        db_table = "Order"
 
    order_id = models.AutoField(primary_key=True)
    products = models.ManyToManyField(Product)
    client_id = models.ForeignKey(Client, on_delete=models.CASCADE)
    status_id = models.ForeignKey(Status, on_delete=models.CASCADE, default=1)
    date_order = models.DateTimeField(auto_now=True)
    date_of_completion = models.DateTimeField(null=True)
    total_price = models.PositiveIntegerField(null=False, default= 5)

products = forms.ModelMultipleChoiceField(label=_('Products'), required=False, queryset=Product.objects.all(),
                                  widget=autocomplete.ModelSelect2Multiple(url='product-autocomplete',
                                                                   attrs={'data-placeholder': "", }))

 path('product-autocomplete/', ProductAutocompleteView.as_view(), name='product-autocomplete'),

from dal_select2.views import Select2QuerySetView
class ProductAutocompleteView(Select2QuerySetView):
 
    def get_queryset(self):
        qs = Product.objects.all()
        if self.q:
            qs = qs.filter(name__icontains=self.q)
        return qs