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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.ForeignKey(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)
################################################################################
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.IntegerField(default=1)
# Test cases for the question in the form of code that is run.
# This is simple Python code.
test = models.TextField()
# 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 last answer submitted by the user.
answer = models.TextField()
# 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 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)
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 answered_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 __unicode__(self):
u = self.user
return u'Question paper for {0} {1}'.format(u.first_name, u.last_name)
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