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     end_time = models.CharField(max_length = 5, null = True, blank = True)
  31
  32     def __unicode__(self):
  33         return ', '.join((self.last_name, self.first_name, self.email))
  34
  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) for i in range(30))
  40         return key
  41
  42     @classmethod
  43     def create(cls, first_name, last_name, email, key = None, contact = None):
  44         submission = cls(
  45             contact = contact,
  46             key = key if key else Submission.generate_key(),
  47             first_name = first_name,
  48             last_name = last_name,
  49             email = email
  50         )
  51
  52         submission.save()
  53         return submission
  54
  55     def get_mark(self, user_id, exercise_id):
  56         mark = None
  57         user_id = str(user_id)
  58         exercise_id = str(exercise_id)
  59         if self.marks and user_id in self.marks:
  60             mark = self.marks[user_id].get(exercise_id, None)
  61         return mark
  62
  63     def set_mark(self, user_id, exercise_id, mark):
  64         user_id = str(user_id)
  65         exercise_id = str(exercise_id)
  66         if not self.marks:
  67             self.marks = dict()
  68
  69         self.marks.setdefault(user_id, {})[exercise_id] = mark
  70         if mark == 'None':
  71             del self.marks[user_id][exercise_id]
  72
  73
  74     def get_exercise_marks_by_examiner(self, exercise_id):
  75         marks = dict()
  76         for examiner_id, examiner_marks in self.marks.items():
  77             mark = examiner_marks.get(exercise_id, None)
  78             if mark is not None:
  79                 marks[examiner_id] = mark
  80         return marks
  81
  82     def get_final_exercise_mark(self, exercise_id):
  83         exercise = exercises[int(exercise_id)-1]
  84         if exercise_checked_manually(exercise):
  85             marks_by_examiner = self.get_exercise_marks_by_examiner(exercise_id)
  86             if len(marks_by_examiner):
  87                 return sum(map(int, marks_by_examiner.values())) / float(len(marks_by_examiner))
  88             else:
  89                 return None
  90         else:
  91             if not self.answers:
  92                 return None
  93             answer = simplejson.loads(self.answers)[exercise_id]['closed_part']
  94             t = exercise['type']
  95             if t == 'edumed_uporzadkuj':
  96                 return exercise['points'] if map(int, answer) == exercise['answer'] else 0
  97             if t == 'edumed_przyporzadkuj':
  98                 toret = 0
  99                 for bucket_id, items in answer.items():
 100                     for item_id in items:
 101                         is_corect = False
 102                         if exercise.get('answer_mode', None) == 'possible_buckets_for_item':
 103                             is_correct = int(bucket_id) in exercise['answer'].get(item_id)
 104                         else:
 105                             is_correct = int(item_id) in exercise['answer'].get(bucket_id, [])
 106                         if is_correct:
 107                             toret += exercise['points_per_hit']
 108                 return toret
 109             if t == 'edumed_wybor':
 110                 if len(exercise['answer']) == 1:
 111                     if len(answer) and int(answer[0]) == exercise['answer'][0]:
 112                         return exercise['points']
 113                     else:
 114                         return 0
 115                 else:
 116                     toret = 0
 117                     if exercise.get('answer_mode', None) == 'all_or_nothing':
 118                         toret = exercise['points'] if map(int, answer) == exercise['answer'] else 0
 119                     else:
 120                         for id in map(int, answer):
 121                             if id in exercise['answer']:
 122                                 toret += exercise['points_per_hit']
 123                     return toret
 124             if t == 'edumed_prawdafalsz':
 125                 toret = 0
 126                 for idx, statement in enumerate(exercise['statements']):
 127                     if answer[idx] == 'true':
 128                         given = True
 129                     elif answer[idx] == 'false':
 130                         given = False
 131                     else:
 132                         given = None
 133                     if given == statement[1]:
 134                         toret += exercise['points_per_hit']
 135                 return toret
 136             raise NotImplementedError
 137
 138     @property
 139     def final_result(self):
 140         final = 0
 141         for exercise_id in map(str,range(1, len(exercises) + 1)):
 142             mark = self.get_final_exercise_mark(exercise_id)
 143             if mark is not None:
 144                 final += mark
 145         return final
 146
 147     @property
 148     def final_result_as_string(self):
 149         return ('%.2f' % self.final_result).rstrip('0').rstrip('.')
 150
 151 class Attachment(models.Model):
 152     submission = models.ForeignKey(Submission)
 153     exercise_id = models.IntegerField()
 154     file = models.FileField(upload_to = 'wtem/attachment')
 155
 156
 157 class Assignment(models.Model):
 158     user = models.ForeignKey(User, unique = True)
 159     exercises = JSONField()
 160
 161     def clean(self):
 162         if not isinstance(self.exercises, list):
 163             raise ValidationError(_('Assigned exercises must be declared in a list format'))
 164         for exercise in self.exercises:
 165             if not isinstance(exercise, int) or exercise < 1:
 166                 raise ValidationError(_('Invalid exercise id: %s' % exercise))
 167
 168     def __unicode__(self):
 169         return self.user.username + ': ' + ','.join(map(str,self.exercises))
 170
 171
 172 def exercise_checked_manually(exercise):
 173     return (exercise['type'] in ('open', 'file_upload')) or 'open_part' in exercise