How to update multiple model objects at a time with bulk_update?

Here from the frontend user gives the input values like this ['1','2', '3']. I want to update the multiple objects at time with bulk_update and I tried like this but this is giving me this error.

ValueError: All bulk_update() objects must have a primary key set.

With this similar way I created objects with bulk_create method which worked fine but with bulk_update it is not workin.

Here I want to update multiple model objects with different values at a time ?

class PVariant(models.Model):
    name = models.CharField(max_length=255)
    product = models.ForeignKey(Product, on_delete=models.CASCADE)
    ....

#views

quantity = request.POST.getlist('quantity')
#['1','2','3']
names = request.POST.getlist('names')
fields = ['name', 'price', 'quantity'..]
params = zip(names, quantity, weight,..)
variants = [PVariant(name=param[0],sku=param[1], quantity=param[2], weight=param[3],
                                       product=product) for param in params]
PVariant.objects.bulk_update(variants, fields)
          

EDIT: From the client side I am getting this types of data in the view.

['name1', 'name2'] names
['12', '1213.0'] field1
['12.0', '12.0']  field2
['1244', '1244']  field3
['11', '11']   field4
['12.0', '12.0'] field5

from How to update multiple model objects at a time with bulk_update?