如何计算我的 QuerySet 的数量。 Django

Question

Well, i have the following function:

employees_birthday = Employees.objects.filter(EmployeeDataNasc__gte=first_day, EmployeeDataNasc__lte=last_day)

It serves to return employees born between the dates. She returns:

<QuerySet [<Employees: Alberto Santos>, <Employees: Josney Arman>]>

But, I would just like to display the number of employees in the QuerySet, ie make a Count function.

Can someone help me with the syntax?

Answer 1

If you are going to display the Employees anyway, then it is better to use len(…) . This will fetch the Employees in memory, and return the number of Employees :

employees_birthday = Employees.objects.filter(
    EmployeeDataNasc__range=(first_day, last_day)
)
number_of_birthdays = employee_birthdays

if you however plan to only render the number of Employees , then you use .count() ^[Django-doc] , since this will prevent fetching the items in memory.