heya,
We have a small project where we need to store a series of exam
results for students.
Some exams receive a grade out of 100, others are simply a pass/fail,
while others are given a one-word grade (e.g. pass, fail, credit,
distinction).
In a sense, they all do map to a 0 to 100 scale (e.g. for the pass/
fail, you can make it 0 and 100, while the pass/fail/credit/
distinction can be mapped to other numbers. However apparently the
users don't want to store it that way, and want them each
differentiated. Also, I suppose you'd need to store somehow which type
of mark it was anyway, for when you need to represent it to the user.
I was thinking of setting up abstract models to handle this, something
like:
class AssessmentTask(models.Model):
name = models.CharField(max_length=20)
paper = models.FileField(upload_to='forms/examination')
date = models.DateField()
class Meta:
abstract = True
class GradedAssessmentTask(AssessmentTask):
mark = models.CharField(max_length=1,
choices=ASSESSMENT_GRADE_CHOICES)
class PassFailAssessmentTask(AssessmentTask):
mark = models.BooleanField()
class NumericalMarkAssessmentTask(AssessmentTask):
mark = models.PositiveIntegerField()
class ExaminationRecord(models.Model):
assessment = models.OneToOneField(AssessmentTask)
You could then create overridden methods to handle pass/fail checking
for each of those. The ExaminationRecord object contains a list of
assessments, each of which is of type AssessmentTask.
However, Django complains with:
AssertionError: OneToOneField cannot define a relation with
abstract class AssessmentTask
So obviously that's not the right way to handle this. What is the
right way within Django to handle something like this?
Cheers,
Victor
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