Django- Creating a dynamic path for file upload in models.py

I am having a model :

class Attendance(models.Model):
    course = models.CharField(max_length=30)
    year = models.IntegerField(_('year'), choices=year_choices, default=current_year)
    sec = models.CharField(max_length=10)
    subject = models.CharField(max_length=30)
    file = models.FileField(upload_to=setFilePath, validators=[validate_file_extension])

and my setFilePath method goes like this :

def setFilePath(instance, filename):
    return 'attendance-record/{course}/{year}/{sec}/{subject}/'.format(course=instance.course, year=instance.year, sec=instance.sec, subject=instance.subject)

but I am not sure of this working ! Can anyone correct me, I want my file destination to be specific like this only and those fields are given in other column of tables

I have searched how to do this and found some ways which includes using 1. two Save method 2. Postgres way Though I am using postgres I want the dir path to be same as this.