diff options
Diffstat (limited to 'yaksh/models.py')
| -rw-r--r-- | yaksh/models.py | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/yaksh/models.py b/yaksh/models.py index 712c455..8415930 100644 --- a/yaksh/models.py +++ b/yaksh/models.py @@ -2,6 +2,7 @@ import datetime import json from random import sample, shuffle from itertools import islice, cycle +from collections import Counter from django.db import models from django.contrib.auth.models import User from taggit.managers import TaggableManager @@ -283,6 +284,70 @@ class QuestionSet(models.Model): ############################################################################### +class AnswerPaperManager(models.Manager): + def get_all_questions(self, questionpaper_id, attempt_number, + status='completed'): + ''' Return a dict of question id as key and count as value''' + papers = self.filter(question_paper_id=questionpaper_id, + attempt_number=attempt_number, status=status) + questions = list() + for paper in papers: + questions += paper.get_questions() + return Counter(map(int, questions)) + + def get_all_questions_answered(self, questionpaper_id, attempt_number, + status='completed'): + ''' Return a dict of answered question id as key and count as value''' + papers = self.filter(question_paper_id=questionpaper_id, + attempt_number=attempt_number, status=status) + questions_answered = list() + for paper in papers: + for question in filter(None, paper.get_questions_answered()): + if paper.is_answer_correct(question): + questions_answered.append(question) + return Counter(map(int, questions_answered)) + + def get_attempt_numbers(self, questionpaper_id, status='completed'): + ''' Return list of attempt numbers''' + attempt_numbers = self.filter( + question_paper_id=questionpaper_id, status=status + ).values_list('attempt_number', flat=True).distinct() + return attempt_numbers + + def has_attempt(self, questionpaper_id, attempt_number, status='completed'): + ''' Whether question paper is attempted''' + return self.filter(question_paper_id=questionpaper_id, + attempt_number=attempt_number, status=status).exists() + + def get_count(self, questionpaper_id, attempt_number, status='completed'): + ''' Return count of answerpapers for a specfic question paper + and attempt number''' + return self.filter(question_paper_id=questionpaper_id, + attempt_number=attempt_number, status=status).count() + + def get_question_statistics(self, questionpaper_id, attempt_number, + status='completed'): + ''' Return dict with question object as key and list as value + The list contains two value, first the number of times a question + was answered correctly, and second the number of times a question + appeared in a quiz''' + question_stats = {} + questions_answered = self.get_all_questions_answered(questionpaper_id, + attempt_number) + questions = self.get_all_questions(questionpaper_id, attempt_number) + all_questions = Question.objects.filter( + id__in=set(questions) + ).order_by('type') + for question in all_questions: + if question.id in questions_answered: + question_stats[question] = [questions_answered[question.id], + questions[question.id]] + else: + question_stats[question] = [0, questions[question.id]] + return question_stats + + +############################################################################### class AnswerPaper(models.Model): """A answer paper for a student -- one per student typically. """ @@ -330,6 +395,8 @@ class AnswerPaper(models.Model): status = models.CharField(max_length=20, choices=test_status,\ default='inprogress') + objects = AnswerPaperManager() + def current_question(self): """Returns the current active question to display.""" qu = self.get_unanswered_questions() @@ -448,6 +515,19 @@ class AnswerPaper(models.Model): q_a[question] = [answer] return q_a + def get_questions(self): + ''' Return a list of questions''' + return self.questions.split('|') + + def get_questions_answered(self): + ''' Return a list of questions answered''' + return self.questions_answered.split('|') + + 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 __unicode__(self): u = self.user return u'Question paper for {0} {1}'.format(u.first_name, u.last_name) @@ -475,3 +555,5 @@ class TestCase(models.Model): # Test case Expected answer in list form expected_answer = models.TextField(blank=True, null = True) + + |