[Answered ]-Django model calculated property

You can override the save() method to do something like this, so that every time you change your job model it recalculates pending. Although I agree with limelights that the pending() method isn’t bad either.

class Job(models.Model):
    accepted = ...
    reject = ...
    pending = ... (Boolean Fields)

    def save(self, *args, **kwargs):
        self.pending = (not self.accepted) and (not self.rejected)
        super(Job, self).save(*args, **kwargs) # Call the "real" save() method.

https://docs.djangoproject.com/en/dev/topics/db/models/#overriding-predefined-model-methods