Creating a student from applicant model

Question

How to create a student from my applicants models? and also giving the students a custom registration number that will be incrementing as new students register.

This my Applicant model

Asked By: MAHMUD UMAR

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Source

Answer 1

class Student(models.Model):
    ....
    registration_number = models.IntegerField()

    def save(*args, **kwargs):
        if self.registration_number is None:
            last_student = Student.objects.order_by("-registration_number").first()
            if last_student is None:
                self.registration_number = 0
            else:
                self.registration_number = last_student.registration_number + 1

        super().save(*args, **kwargs)

Something like the following should handle the a prefix

prefix = "something"
qs = Student.objects.annotate(increment=Cast(SubStr("registration_number", len(prefix) + 1), output_field=models.IntegerField()))
last_student = Student.objects.order_by("-increment").first()
if last_student is None:
    self.registration_number = f"{prefix}0"
else:
    self.registration_number = f"{prefix}{last_student.increment + 1}

Answered By: Alombaros

Creating a student from applicant model

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