wtem/models.py

   1 import random
   2 import string
   3 import os
   4
   5 from django.db import models
   6 from django.contrib.auth.models import User
   7 from django.core.exceptions import ValidationError
   8 from django.utils import simplejson
   9 from django.utils.translation import ugettext as _
  10 from jsonfield import JSONField
  11
  12 from contact.models import Contact
  13
  14 f = file(os.path.dirname(__file__) + '/fixtures/exercises.json')
  15 exercises = simplejson.loads(f.read())
  16 f.close()
  17
  18 DEBUG_KEY = '12345'
  19
  20 class Submission(models.Model):
  21     contact = models.ForeignKey(Contact, null = True)
  22     key = models.CharField(max_length = 30, unique = True)
  23     first_name = models.CharField(max_length = 100)
  24     last_name = models.CharField(max_length = 100)
  25     email = models.EmailField(max_length = 100, unique = True)
  26     answers = models.CharField(max_length = 65536, null = True, blank = True)
  27     key_sent = models.BooleanField(default = False)
  28     marks = JSONField()
  29     examiners = models.ManyToManyField(User, null = True, blank = True)
  30
  31     def __unicode__(self):
  32         return ', '.join((self.last_name, self.first_name, self.email))
  33
  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) for i in range(30))
  39         return key
  40
  41     @classmethod
  42     def create(cls, first_name, last_name, email, key = None, contact = None):
  43         submission = cls(
  44             contact = contact,
  45             key = key if key else Submission.generate_key(),
  46             first_name = first_name,
  47             last_name = last_name,
  48             email = email
  49         )
  50
  51         submission.save()
  52         return submission
  53
  54     def get_mark(self, user_id, exercise_id):
  55         mark = None
  56         user_id = str(user_id)
  57         exercise_id = str(exercise_id)
  58         if self.marks and user_id in self.marks:
  59             mark = self.marks[user_id].get(exercise_id, None)
  60         return mark
  61
  62     def set_mark(self, user_id, exercise_id, mark):
  63         user_id = str(user_id)
  64         exercise_id = str(exercise_id)
  65         if not self.marks:
  66             self.marks = dict()
  67
  68         self.marks.setdefault(user_id, {})[exercise_id] = mark
  69         if mark == 'None':
  70             del self.marks[user_id][exercise_id]
  71
  72
  73     def get_exercise_marks_by_examiner(self, exercise_id):
  74         marks = dict()
  75         for examiner_id, examiner_marks in self.marks.items():
  76             mark = examiner_marks.get(exercise_id, None)
  77             if mark is not None:
  78                 marks[examiner_id] = mark
  79         return marks
  80
  81     def get_final_exercise_mark(self, exercise_id):
  82         exercise = exercises[int(exercise_id)-1]
  83         if exercise_checked_manually(exercise):
  84             marks_by_examiner = self.get_exercise_marks_by_examiner(exercise_id)
  85             if len(marks_by_examiner):
  86                 return max(map(int, marks_by_examiner.values()))
  87             else:
  88                 return None
  89         else:
  90             if not self.answers:
  91                 return None
  92             answer = simplejson.loads(self.answers)[exercise_id]['closed_part']
  93             t = exercise['type']
  94             if t == 'edumed_uporzadkuj':
  95                 return exercise['points'] if map(int, answer) == exercise['answer'] else 0
  96             if t == 'edumed_przyporzadkuj':
  97                 toret = 0
  98                 for bucket_id, items in answer.items():
  99                     for item_id in items:
 100                         is_corect = False
 101                         if exercise.get('answer_mode', None) == 'possible_buckets_for_item':
 102                             is_correct = int(bucket_id) in exercise['answer'].get(item_id)
 103                         else:
 104                             is_correct = int(item_id) in exercise['answer'].get(bucket_id, [])
 105                         if is_correct:
 106                             toret += exercise['points_per_hit']
 107                 return toret
 108             if t == 'edumed_wybor':
 109                 if len(exercise['answer']) == 1:
 110                     if len(answer) and int(answer[0]) == exercise['answer'][0]:
 111                         return exercise['points']
 112                     else:
 113                         return 0
 114                 else:
 115                     toret = 0
 116                     if exercise.get('answer_mode', None) == 'all_or_nothing':
 117                         toret = exercise['points'] if map(int, answer) == exercise['answer'] else 0
 118                     else:
 119                         for id in map(int, answer):
 120                             if id in exercise['answer']:
 121                                 toret += exercise['points_per_hit']
 122                     return toret
 123             if t == 'edumed_prawdafalsz':
 124                 toret = 0
 125                 for idx, statement in enumerate(exercise['statements']):
 126                     if answer[idx] == 'true':
 127                         given = True
 128                     elif answer[idx] == 'false':
 129                         given = False
 130                     else:
 131                         given = None
 132                     if given == statement[1]:
 133                         toret += exercise['points_per_hit']
 134                 return toret
 135             raise NotImplementedError
 136
 137     @property
 138     def final_result(self):
 139         final = 0
 140         for exercise_id in map(str,range(1, len(exercises) + 1)):
 141             mark = self.get_final_exercise_mark(exercise_id)
 142             if mark is not None:
 143                 final += mark
 144         return final
 145
 146     @property
 147     def final_result_as_string(self):
 148         return ('%.2f' % self.final_result).rstrip('0').rstrip('.')
 149
 150 class Attachment(models.Model):
 151     submission = models.ForeignKey(Submission)
 152     exercise_id = models.IntegerField()
 153     file = models.FileField(upload_to = 'wtem/attachment')
 154
 155
 156 class Assignment(models.Model):
 157     user = models.ForeignKey(User, unique = True)
 158     exercises = JSONField()
 159
 160     def clean(self):
 161         if not isinstance(self.exercises, list):
 162             raise ValidationError(_('Assigned exercises must be declared in a list format'))
 163         for exercise in self.exercises:
 164             if not isinstance(exercise, int) or exercise < 1:
 165                 raise ValidationError(_('Invalid exercise id: %s' % exercise))
 166
 167     def __unicode__(self):
 168         return self.user.username + ': ' + ','.join(map(str,self.exercises))
 169
 170
 171 def exercise_checked_manually(exercise):
 172     return (exercise['type'] in ('open', 'file_upload')) or 'open_part' in exercise