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authorPrabhu Ramachandran2011-12-24 05:46:36 -0800
committerPrabhu Ramachandran2011-12-24 05:46:36 -0800
commit95e9ea0f60b21595fa0f6ffea12da13b33821018 (patch)
tree8114286da06869c7059d6dbb2322641f15202408 /testapp/exam/models.py
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parent7b819758d4d60822c19611845a44f8c5301a391c (diff)
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Merge pull request #2 from parth115/master
Changed to Buildout
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+import datetime
+from django.db import models
+from django.contrib.auth.models import User
+
+################################################################################
+class Profile(models.Model):
+ """Profile for a user to store roll number and other details."""
+ user = models.OneToOneField(User)
+ roll_number = models.CharField(max_length=20)
+ institute = models.CharField(max_length=128)
+ department = models.CharField(max_length=64)
+ position = models.CharField(max_length=64)
+
+
+QUESTION_TYPE_CHOICES = (
+ ("python", "Python"),
+ ("bash", "Bash"),
+ ("mcq", "MultipleChoice"),
+ )
+
+################################################################################
+class Question(models.Model):
+ """A question in the database."""
+
+ # A one-line summary of the question.
+ summary = models.CharField(max_length=256)
+
+ # The question text, should be valid HTML.
+ description = models.TextField()
+
+ # Number of points for the question.
+ points = models.FloatField(default=1.0)
+
+ # Test cases for the question in the form of code that is run.
+ test = models.TextField(blank=True)
+
+ # Any multiple choice options. Place one option per line.
+ options = models.TextField(blank=True)
+
+ # The type of question.
+ type = models.CharField(max_length=24, choices=QUESTION_TYPE_CHOICES)
+
+ # Is this question active or not. If it is inactive it will not be used
+ # when creating a QuestionPaper.
+ active = models.BooleanField(default=True)
+
+ def __unicode__(self):
+ return self.summary
+
+
+################################################################################
+class Answer(models.Model):
+ """Answers submitted by users.
+ """
+ # The question for which we are an answer.
+ question = models.ForeignKey(Question)
+
+ # The answer submitted by the user.
+ answer = models.TextField()
+
+ # Error message when auto-checking the answer.
+ error = models.TextField()
+
+ # Marks obtained for the answer. This can be changed by the teacher if the
+ # grading is manual.
+ marks = models.FloatField(default=0.0)
+
+ # Is the answer correct.
+ correct = models.BooleanField(default=False)
+
+ def __unicode__(self):
+ return self.answer
+
+################################################################################
+class Quiz(models.Model):
+ """A quiz that students will participate in. One can think of this
+ as the "examination" event.
+ """
+
+ # The starting/ending date of the quiz.
+ start_date = models.DateField("Date of the quiz")
+
+ # This is always in minutes.
+ duration = models.IntegerField("Duration of quiz in minutes", default=20)
+
+ # Is the quiz active. The admin should deactivate the quiz once it is
+ # complete.
+ active = models.BooleanField(default=True)
+
+ # Description of quiz.
+ description = models.CharField(max_length=256)
+
+ class Meta:
+ verbose_name_plural = "Quizzes"
+
+ def __unicode__(self):
+ desc = self.description or 'Quiz'
+ return '%s: on %s for %d minutes'%(desc, self.start_date, self.duration)
+
+
+################################################################################
+class QuestionPaper(models.Model):
+ """A question paper for a student -- one per student typically.
+ """
+ # The user taking this question paper.
+ user = models.ForeignKey(User)
+
+ # The user's profile, we store a reference to make it easier to access the
+ # data.
+ profile = models.ForeignKey(Profile)
+
+ # The Quiz to which this question paper is attached to.
+ quiz = models.ForeignKey(Quiz)
+
+ # The time when this paper was started by the user.
+ start_time = models.DateTimeField()
+
+ # User's IP which is logged.
+ user_ip = models.CharField(max_length=15)
+ # Unused currently.
+ key = models.CharField(max_length=10)
+
+ # used to allow/stop a user from retaking the question paper.
+ active = models.BooleanField(default = True)
+
+ # The questions (a list of ids separated by '|')
+ questions = models.CharField(max_length=128)
+ # The questions successfully answered (a list of ids separated by '|')
+ questions_answered = models.CharField(max_length=128)
+
+ # All the submitted answers.
+ answers = models.ManyToManyField(Answer)
+
+ # Teacher comments on the question paper.
+ comments = models.TextField()
+
+ def current_question(self):
+ """Returns the current active question to display."""
+ qs = self.questions.split('|')
+ if len(qs) > 0:
+ return qs[0]
+ else:
+ return ''
+
+ def questions_left(self):
+ """Returns the number of questions left."""
+ qs = self.questions
+ if len(qs) == 0:
+ return 0
+ else:
+ return qs.count('|') + 1
+
+ def completed_question(self, question_id):
+ """Removes the question from the list of questions and returns
+ the next."""
+ qa = self.questions_answered
+ if len(qa) > 0:
+ self.questions_answered = '|'.join([qa, str(question_id)])
+ else:
+ self.questions_answered = str(question_id)
+ qs = self.questions.split('|')
+ qs.remove(unicode(question_id))
+ self.questions = '|'.join(qs)
+ self.save()
+ if len(qs) == 0:
+ return ''
+ else:
+ return qs[0]
+
+ def skip(self):
+ """Skip the current question and return the next available question."""
+ qs = self.questions.split('|')
+ if len(qs) == 0:
+ return ''
+ else:
+ # Put head at the end.
+ head = qs.pop(0)
+ qs.append(head)
+ self.questions = '|'.join(qs)
+ self.save()
+ return qs[0]
+
+ def time_left(self):
+ """Return the time remaining for the user in seconds."""
+ dt = datetime.datetime.now() - self.start_time
+ try:
+ secs = dt.total_seconds()
+ except AttributeError:
+ # total_seconds is new in Python 2.7. :(
+ secs = dt.seconds + dt.days*24*3600
+ total = self.quiz.duration*60.0
+ remain = max(total - secs, 0)
+ return int(remain)
+
+ def get_answered_str(self):
+ """Returns the answered questions, sorted and as a nice string."""
+ qa = self.questions_answered.split('|')
+ answered = ', '.join(sorted(qa))
+ return answered if answered else 'None'
+
+ def get_total_marks(self):
+ """Returns the total marks earned by student for this paper."""
+ return sum([x.marks for x in self.answers.filter(marks__gt=0.0)])
+
+ def get_question_answers(self):
+ """Return a dictionary with keys as questions and a list of the corresponding
+ answers.
+ """
+ q_a = {}
+ for answer in self.answers.all():
+ question = answer.question
+ if question in q_a:
+ q_a[question].append(answer)
+ else:
+ q_a[question] = [answer]
+ return q_a
+
+ def __unicode__(self):
+ u = self.user
+ return u'Question paper for {0} {1}'.format(u.first_name, u.last_name)
+