fill field's value of model which is depend on another model

Using Django
1

I have models

class Product(models.Model):
    category = models.ForeignKey(Category, on_delete=models.CASCADE, )
    name = models.CharField(max_length=50')
    seats = models.PositiveIntegerField()
    quantity = models.PositiveIntegerField(validators=[MinValueValidator(1)])


class ReserveModel(models.Model):
    products = models.ManyToManyField(Product, related_name='rented')
    rent_from = models.DateField()
    rent_to = models.DateField()

when I create instance of ReservetModel I have to have ability to point quantity of each selected product, how can I implement this?

2

Are you saying you want to track / find out how many ReserveModel are associated with a particular Product?

If so, what you don’t want to do is try and track it manually. Use the count function to get the number when you need it.

3

No, I mean, I wanna be able to point “quanitity” field of model Poduct when I am creating a ReserveModel instance

4

I’m sorry, I’m going to need you to be more verbose and explain exactly what you mean by “point “quanitity” field of model Poduct”. What do you want the quantity field to contain?