import datetime from django.db import models from django.contrib.auth.models import User from taggit_autocomplete_modified.managers import TaggableManagerAutocomplete as TaggableManager from django.http import HttpResponse ################################################################################ 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) #Tags for the Question. tags = TaggableManager() 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) #Tags for the Quiz. tags = TaggableManager() 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): quiz = models.ForeignKey(Quiz) questions = models.ManyToManyField(Question) ################################################################################ class AnswerPaper(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) # All questions that remains to attempt to perticular Student questions = models.CharField(max_length=128) # The Quiz to which this question paper is attached to. question_paper = models.ForeignKey(QuestionPaper) # 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) # 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.question_paper.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)