stage2/models.py

   1 # -*- coding: utf-8 -*-
   2 import os
   3 import random
   4 import string
   5
   6 from django.contrib.auth.models import User
   7 from django.core.urlresolvers import reverse
   8 from django.db import models
   9 from django.db.models.signals import post_save
  10 from django.dispatch import receiver
  11 from django.utils.translation import ugettext_lazy as _
  12 from django.utils import timezone
  13 from jsonfield import JSONField
  14
  15 from contact.models import Contact
  16
  17
  18 class Participant(models.Model):
  19     contact = models.ForeignKey(Contact, verbose_name=_('contact'), null=True)
  20     key = models.CharField(_('key'), max_length=30, unique=True)
  21     first_name = models.CharField(_('first name'), max_length=100)
  22     last_name = models.CharField(_('last_name'), max_length=100)
  23     email = models.EmailField(_('email'), max_length=100, unique=True)
  24     key_sent = models.BooleanField(_('key sent'), default=False)
  25
  26     class Meta:
  27         verbose_name = _('participant')
  28         verbose_name_plural = _('participants')
  29
  30     def __unicode__(self):
  31         return ', '.join((self.last_name, self.first_name, self.email))
  32
  33     # copy-paste from wtem
  34     @classmethod
  35     def generate_key(cls):
  36         key = ''
  37         while not key or key in [record['key'] for record in cls.objects.values('key')]:
  38             key = ''.join(random.choice(string.ascii_uppercase + string.ascii_lowercase + string.digits)
  39                           for i in range(30))
  40         return key
  41
  42     # copy-paste from wtem
  43     @classmethod
  44     def create(cls, first_name, last_name, email, key=None, contact=None):
  45         return cls.objects.create(
  46             contact=contact,
  47             key=key if key else cls.generate_key(),
  48             first_name=first_name,
  49             last_name=last_name,
  50             email=email)
  51
  52     def check(self, key):
  53         return key == self.key
  54
  55     def score(self):
  56         return sum(answer.score() for answer in self.answer_set.all())
  57
  58
  59 class Assignment(models.Model):
  60     title = models.CharField(_('title'), max_length=128)
  61     content = models.TextField(_('content'))
  62     deadline = models.DateTimeField(_('deadline'))
  63     max_points = models.IntegerField(_('max points'))
  64     experts = models.ManyToManyField(User, verbose_name=_('experts'), related_name='stage2_assignments')
  65     file_descriptions = JSONField(_('file descriptions'))
  66
  67     class Meta:
  68         ordering = ['deadline']
  69         verbose_name = _('assignment')
  70         verbose_name_plural = _('assignments')
  71
  72     def __unicode__(self):
  73         return self.title
  74
  75     def available_answers(self, expert):
  76         return self.answer_set.exclude(mark__expert=expert).exclude(complete=True)
  77
  78     def is_active(self):
  79         return self.deadline >= timezone.now()
  80
  81
  82 class Answer(models.Model):
  83     participant = models.ForeignKey(Participant)
  84     assignment = models.ForeignKey(Assignment)
  85     # useful redundancy
  86     complete = models.BooleanField(default=False)
  87
  88     class Meta:
  89         unique_together = ['participant', 'assignment']
  90
  91     def update_complete(self):
  92         marks = self.mark_set.all()
  93         if len(marks) < 2:
  94             complete = False
  95         elif len(marks) == 2:
  96             mark1, mark2 = marks
  97             complete = abs(mark1.points - mark2.points) < 0.2 * self.assignment.max_points
  98         else:
  99             complete = True
 100         self.complete = complete
 101         self.save()
 102
 103     def score(self):
 104         marks = self.mark_set.all()
 105         if len(marks) < 2:
 106             return None
 107         return self.mark_set.aggregate(models.Avg('points'))
 108
 109
 110 def attachment_path(instance, filename):
 111     answer = instance.answer
 112     return 'stage2/attachment/%s/%s/%s/%s' % (answer.participant_id, answer.assignment_id, instance.file_no, filename)
 113
 114
 115 class Attachment(models.Model):
 116     answer = models.ForeignKey(Answer)
 117     file_no = models.IntegerField()
 118     file = models.FileField(upload_to=attachment_path)
 119
 120     class Meta:
 121         ordering = ['file_no']
 122
 123     def filename(self):
 124         return os.path.basename(self.file.name)
 125
 126     def download_url(self):
 127         return reverse(
 128             'stage2_participant_file',
 129             args=(self.answer.assignment_id, self.file_no,
 130                   self.answer.participant_id, self.answer.participant.key))
 131
 132     def expert_download_url(self):
 133         return reverse('stage2_expert_download', args=[self.id])
 134
 135
 136 class Mark(models.Model):
 137     expert = models.ForeignKey(User)
 138     answer = models.ForeignKey(Answer)
 139     points = models.DecimalField(verbose_name=_('points'), max_digits=3, decimal_places=1)
 140
 141     class Meta:
 142         unique_together = ['expert', 'answer']
 143
 144
 145 @receiver(post_save, sender=Mark, dispatch_uid='update_answer')
 146 def update_answer(sender, **kwargs):
 147     mark = kwargs['instance']
 148     mark.answer.update_complete()