stage2/models.py

   1 # -*- coding: utf-8 -*-
   2 import os
   3 import random
   4 import string
   5
   6 from django.conf import settings
   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     complete_set = models.BooleanField(default=False)
  26
  27     class Meta:
  28         verbose_name = _('participant')
  29         verbose_name_plural = _('participants')
  30
  31     def __unicode__(self):
  32         return ', '.join((self.last_name, self.first_name, self.email))
  33
  34     # copy-paste from wtem
  35     @classmethod
  36     def generate_key(cls):
  37         key = ''
  38         while not key or key in [record['key'] for record in cls.objects.values('key')]:
  39             key = ''.join(random.choice(string.ascii_uppercase + string.ascii_lowercase + string.digits)
  40                           for i in range(30))
  41         return key
  42
  43     # copy-paste from wtem
  44     @classmethod
  45     def create(cls, first_name, last_name, email, key=None, contact=None):
  46         return cls.objects.create(
  47             contact=contact,
  48             key=key if key else cls.generate_key(),
  49             first_name=first_name,
  50             last_name=last_name,
  51             email=email)
  52
  53     def check(self, key):
  54         return key == self.key
  55
  56     def score(self):
  57         return sum(answer.score() for answer in self.answer_set.all())
  58
  59
  60 class Assignment(models.Model):
  61     title = models.CharField(_('title'), max_length=128)
  62     content = models.TextField(_('content'))
  63     content_url = models.URLField(_('URL'))
  64     deadline = models.DateTimeField(_('deadline'))
  65     max_points = models.IntegerField(_('max points'))
  66     experts = models.ManyToManyField(
  67         settings.AUTH_USER_MODEL, verbose_name=_('experts'), related_name='stage2_assignments')
  68     arbiters = models.ManyToManyField(
  69         settings.AUTH_USER_MODEL, blank=True, verbose_name=_('arbiters'), related_name='stage2_arbitrated')
  70     supervisors = models.ManyToManyField(
  71         settings.AUTH_USER_MODEL, verbose_name=_('supervisors'), related_name='stage2_supervised')
  72     file_descriptions = JSONField(_('file descriptions'))
  73
  74     class Meta:
  75         ordering = ['deadline', 'title']
  76         verbose_name = _('assignment')
  77         verbose_name_plural = _('assignments')
  78
  79     def __unicode__(self):
  80         return self.title
  81
  82     def available_answers(self, expert):
  83         answers = self.answer_set.exclude(mark__expert=expert).filter(participant__complete_set=True)
  84         if expert not in self.supervisors.all():
  85             answers = answers.exclude(complete=True)
  86         if expert in self.arbiters.all():
  87             answers = answers.filter(need_arbiter=True)
  88         return answers
  89
  90     def is_active(self):
  91         return self.deadline >= timezone.now()
  92
  93
  94 class Answer(models.Model):
  95     participant = models.ForeignKey(Participant)
  96     assignment = models.ForeignKey(Assignment)
  97     # useful redundancy
  98     complete = models.BooleanField(default=False)
  99     need_arbiter = models.BooleanField(default=False)
 100
 101     class Meta:
 102         unique_together = ['participant', 'assignment']
 103
 104     def update_complete(self):
 105         marks = self.mark_set.all()
 106         if len(marks) < 2:
 107             complete = False
 108             need_arbiter = False
 109         elif len(marks) == 2:
 110             mark1, mark2 = marks
 111             complete = abs(mark1.points - mark2.points) < 0.2 * self.assignment.max_points
 112             need_arbiter = not complete
 113         else:
 114             complete = True
 115             need_arbiter = False
 116         self.complete = complete
 117         self.need_arbiter = need_arbiter
 118         self.save()
 119
 120     def score(self):
 121         marks = self.mark_set.all()
 122         if len(marks) < 2:
 123             return None
 124         return self.mark_set.aggregate(models.Avg('points'))
 125
 126
 127 def attachment_path(instance, filename):
 128     answer = instance.answer
 129     return 'stage2/attachment/%s/%s/%s/%s' % (answer.participant_id, answer.assignment_id, instance.file_no, filename)
 130
 131
 132 class Attachment(models.Model):
 133     answer = models.ForeignKey(Answer)
 134     file_no = models.IntegerField()
 135     file = models.FileField(upload_to=attachment_path)
 136
 137     class Meta:
 138         ordering = ['file_no']
 139
 140     def filename(self):
 141         return os.path.basename(self.file.name)
 142
 143     def download_url(self):
 144         return reverse(
 145             'stage2_participant_file',
 146             args=(self.answer.assignment_id, self.file_no,
 147                   self.answer.participant_id, self.answer.participant.key))
 148
 149     def expert_download_url(self):
 150         return reverse('stage2_expert_download', args=[self.id])
 151
 152
 153 class Mark(models.Model):
 154     expert = models.ForeignKey(settings.AUTH_USER_MODEL)
 155     answer = models.ForeignKey(Answer)
 156     points = models.DecimalField(verbose_name=_('points'), max_digits=3, decimal_places=1)
 157
 158     class Meta:
 159         unique_together = ['expert', 'answer']
 160
 161
 162 @receiver(post_save, sender=Mark, dispatch_uid='update_answer')
 163 def update_answer(sender, **kwargs):
 164     mark = kwargs['instance']
 165     mark.answer.update_complete()