Model property in Django

When you want to associate field with some function you can override save() method. Another convenient way to do this is to use Python property getter/setter to run some custom code. Important thing is that you don't have to run migrations to do this (if tables are not changed of course)

class TestCase(models.Model):
    TEST_STATUS_CHOICES = (
        ("passed", "passed"),
        ("failed", "failed"),
        ("unknown", "unknown"),
        ("error", "error"),
    )

    _status = models.CharField(
        max_length=9, choices=TEST_STATUS_CHOICES, default="unknown", db_column="status"
    )

    @property
    def status(self):
        return self._status

    @status.setter
    def status(self, value):
        if value in ["passed", "failed", "unknown"]:
            self._status = value
        else:
            self.scenario.status = "error"
            self._status = "error"
        self.save()

Sources:

@property - Python Documentation
STAVROV'STUFF - How to replace a Django model field with a property
Corey Schafer - Property Decorators - Getters, Setters, and Deleters (youtube)