diff options
Diffstat (limited to 'yaksh/models.py')
| -rw-r--r-- | yaksh/models.py | 166 |
1 files changed, 95 insertions, 71 deletions
diff --git a/yaksh/models.py b/yaksh/models.py index 7bd0a9e..4d52794 100644 --- a/yaksh/models.py +++ b/yaksh/models.py @@ -1,4 +1,4 @@ -import datetime +from datetime import datetime, timedelta import json from random import sample, shuffle from itertools import islice, cycle @@ -70,7 +70,7 @@ class Course(models.Model): students = models.ManyToManyField(User, related_name='students') requests = models.ManyToManyField(User, related_name='requests') rejected = models.ManyToManyField(User, related_name='rejected') - created_on = models.DateTimeField(default=datetime.datetime.now()) + created_on = models.DateTimeField(default=datetime.now()) def request(self, *users): self.requests.add(*users) @@ -227,6 +227,10 @@ class Answer(models.Model): ############################################################################### +class QuizManager(models.Manager): + def get_active_quizzes(self): + return self.filter(active=True) +############################################################################### class Quiz(models.Model): """A quiz that students will participate in. One can think of this as the "examination" event. @@ -236,12 +240,12 @@ class Quiz(models.Model): # The start date of the quiz. start_date_time = models.DateTimeField("Start Date and Time of the quiz", - default=datetime.datetime.now(), + default=datetime.now(), null=True) # The end date and time of the quiz end_date_time = models.DateTimeField("End Date and Time of the quiz", - default=datetime.datetime(2199, 1, 1, 0, 0, 0, 0), + default=datetime(2199, 1, 1, 0, 0, 0, 0), null=True) # This is always in minutes. @@ -269,9 +273,18 @@ class Quiz(models.Model): time_between_attempts = models.IntegerField("Number of Days",\ choices=days_between_attempts) + objects = QuizManager() + class Meta: verbose_name_plural = "Quizzes" + + def is_expired(self): + return not self.start_date_time <= datetime.now() < self.end_date_time + + def has_prerequisite(self): + return True if self.prerequisite else False + def __unicode__(self): desc = self.description or 'Quiz' return '%s: on %s for %d minutes' % (desc, self.start_date_time, @@ -318,18 +331,34 @@ class QuestionPaper(models.Model): def make_answerpaper(self, user, ip, attempt_num): """Creates an answer paper for the user to attempt the quiz""" ans_paper = AnswerPaper(user=user, user_ip=ip, attempt_number=attempt_num) - ans_paper.start_time = datetime.datetime.now() + ans_paper.start_time = datetime.now() ans_paper.end_time = ans_paper.start_time \ - + datetime.timedelta(minutes=self.quiz.duration) + + timedelta(minutes=self.quiz.duration) ans_paper.question_paper = self + ans_paper.save() questions = self._get_questions_for_answerpaper() - question_ids = [str(x.id) for x in questions] - if self.shuffle_questions: - shuffle(question_ids) - ans_paper.questions = "|".join(question_ids) + ans_paper.questions.add(*questions) + ans_paper.questions_unanswered.add(*questions) ans_paper.save() return ans_paper + def is_questionpaper_passed(self, user): + return AnswerPaper.objects.filter(question_paper=self, user=user, + passed = True).exists() + + def is_attempt_allowed(self, user): + attempts = AnswerPaper.objects.get_total_attempt(questionpaper=self, + user=user) + return attempts != self.quiz.attempts_allowed + + def can_attempt_now(self, user): + last_attempt = AnswerPaper.objects.get_user_last_attempt(user=user, + questionpaper=self) + if last_attempt: + time_lag = (datetime.today() - last_attempt.start_time).days + return time_lag >= self.quiz.time_between_attempts + else: + return True ############################################################################### class QuestionSet(models.Model): @@ -431,6 +460,17 @@ class AnswerPaperManager(models.Manager): def _get_latest_attempt(self, answerpapers, user_id): return answerpapers.filter(user_id=user_id).order_by('-attempt_number')[0] + def get_user_last_attempt(self, questionpaper, user): + attempts = self.filter(question_paper=questionpaper, + user=user).order_by('-attempt_number') + if attempts: + return attempts[0] + + def get_user_answerpapers(self, user): + return self.filter(user=user) + + def get_total_attempt(self, questionpaper, user): + return self.filter(question_paper=questionpaper, user=user).count() ############################################################################### class AnswerPaper(models.Model): @@ -439,9 +479,7 @@ class AnswerPaper(models.Model): # The user taking this question paper. user = models.ForeignKey(User) - # All questions that remain to be attempted for a particular Student - # (a list of ids separated by '|') - questions = models.CharField(max_length=128) + questions = models.ManyToManyField(Question, related_name='questions') # The Quiz to which this question paper is attached to. question_paper = models.ForeignKey(QuestionPaper) @@ -458,8 +496,13 @@ class AnswerPaper(models.Model): # 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) + # The questions unanswered + questions_unanswered = models.ManyToManyField(Question, + related_name='questions_unanswered') + + # The questions answered + questions_answered = models.ManyToManyField(Question, + related_name='questions_answered') # All the submitted answers. answers = models.ManyToManyField(Answer) @@ -484,66 +527,36 @@ class AnswerPaper(models.Model): def current_question(self): """Returns the current active question to display.""" - qu = self.get_unanswered_questions() - if len(qu) > 0: - return qu[0] - else: - return '' + return self.questions_unanswered.first() def questions_left(self): """Returns the number of questions left.""" - qu = self.get_unanswered_questions() - return len(qu) - - def get_unanswered_questions(self): - """Returns the list of unanswered questions.""" - qa = self.questions_answered.split('|') - qs = self.questions.split('|') - qu = [q for q in qs if q not in qa] - return qu + return self.questions_unanswered.count() def completed_question(self, question_id): """ Adds the completed question to the list of answered questions and returns the next question. """ - qa = self.questions_answered - if len(qa) > 0: - self.questions_answered = '|'.join([qa, str(question_id)]) - else: - self.questions_answered = str(question_id) - self.save() + self.questions_answered.add(question_id) + self.questions_unanswered.remove(question_id) - return self.skip(question_id) + return self.current_question() def skip(self, question_id): """ Skips the current question and returns the next sequentially available question. """ - qu = self.get_unanswered_questions() - qs = self.questions.split('|') - - if len(qu) == 0: - return '' - - try: - q_index = qs.index(unicode(question_id)) - except ValueError: - return qs[0] - - start = q_index + 1 - stop = q_index + 1 + len(qs) - q_list = islice(cycle(qs), start, stop) - for next_q in q_list: - if next_q in qu: - return next_q - - return qs[0] + questions = self.questions_unanswered.all() + question_cycle = cycle(questions) + for question in question_cycle: + if question.id==int(question_id): + return question_cycle.next() def time_left(self): """Return the time remaining for the user in seconds.""" - dt = datetime.datetime.now() - self.start_time.replace(tzinfo=None) + dt = datetime.now() - self.start_time.replace(tzinfo=None) try: secs = dt.total_seconds() except AttributeError: @@ -553,25 +566,22 @@ class AnswerPaper(models.Model): 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 update_marks_obtained(self): + def _update_marks_obtained(self): """Updates the total marks earned by student for this paper.""" marks = sum([x.marks for x in self.answers.filter(marks__gt=0.0)]) - self.marks_obtained = marks + if not marks: + self.marks_obtained = 0 + else: + self.marks_obtained = marks - def update_percent(self): + def _update_percent(self): """Updates the percent gained by the student for this paper.""" total_marks = self.question_paper.total_marks if self.marks_obtained is not None: percent = self.marks_obtained/self.question_paper.total_marks*100 self.percent = round(percent, 2) - def update_passed(self): + def _update_passed(self): """ Checks whether student passed or failed, as per the quiz passing criteria. @@ -582,10 +592,18 @@ class AnswerPaper(models.Model): else: self.passed = False - def update_status(self, state): + def _update_status(self, state): """ Sets status as inprogress or completed """ self.status = state + def update_marks(self, state='completed'): + self._update_marks_obtained() + self._update_percent() + self._update_passed() + self._update_status(state) + self.end_time = datetime.now() + self.save() + def get_question_answers(self): """ Return a dictionary with keys as questions and a list of the @@ -601,18 +619,24 @@ class AnswerPaper(models.Model): return q_a def get_questions(self): - ''' Return a list of questions''' - return self.questions.split('|') + return self.questions.all() def get_questions_answered(self): - ''' Return a list of questions answered''' - return self.questions_answered.split('|') + return self.questions_answered.all() + + def get_questions_unanswered(self): + return self.questions_unanswered.all() def is_answer_correct(self, question_id): ''' Return marks of a question answered''' return self.answers.filter(question_id=question_id, correct=True).exists() + def is_attempt_inprogress(self): + if self.status == 'inprogress': + return self.time_left()> 0 + + def __unicode__(self): u = self.user return u'Question paper for {0} {1}'.format(u.first_name, u.last_name) |