No Validation on Field Choices Django Postgres?

Question

I created a Student model with field choices. However, when I save it, it doesn't validate whether the choice is in the choices I specified in the model field.

Why doesn't it prevent me from saving a new object with a choice I didn't specify in my model?

Here is the model:

class Student(models.Model):
    year_in_school = models.CharField(
        max_length=4,
        choices= [
            ('FRES', 'Freshman'),
            ('SOPH', 'Sophomore'),
        ],
    )

And here is the code I wrote in the shell:

>>> from app.models import Student
>>> new_student = Student.objects.create(year_in_school='HACK')
>>> new_student.year_in_school
'HA'

Answer 1

You might want to read more about choices here. The relevant part copied below:

If choices are given, they’re enforced by model validation

Choices are not enforced at the database level. You need to perform model validation (by calling full_clean()) in order to check it.

full_clean() will not be called automatically when you call your model’s save() method. You’ll need to call it manually.