wtem/models.py

   1 # -*- coding: utf-8 -*-
   2 import random
   3 import string
   4 import os
   5 import json
   6
   7 from django.db import models
   8 from django.contrib.auth.models import User
   9 from django.core.exceptions import ValidationError
  10 from django.utils.translation import ugettext as _
  11 from jsonfield import JSONField
  12
  13 from contact.models import Contact
  14
  15 f = file(os.path.dirname(__file__) + '/fixtures/exercises.json')
  16 exercises = json.loads(f.read())
  17 f.close()
  18
  19 DEBUG_KEY = '12345'
  20
  21
  22 class Submission(models.Model):
  23     contact = models.ForeignKey(Contact, null=True)
  24     key = models.CharField(max_length=30, unique=True)
  25     first_name = models.CharField(max_length=100)
  26     last_name = models.CharField(max_length=100)
  27     email = models.EmailField(max_length=100, unique=True)
  28     answers = models.CharField(max_length=65536, null=True, blank=True)
  29     key_sent = models.BooleanField(default=False)
  30     marks = JSONField(default={})
  31     examiners = models.ManyToManyField(User, null=True, blank=True)
  32     end_time = models.CharField(max_length=5, null=True, blank=True)
  33
  34     def __unicode__(self):
  35         return ', '.join((self.last_name, self.first_name, self.email))
  36
  37     @classmethod
  38     def generate_key(cls):
  39         key = ''
  40         while not key or key in [record['key'] for record in cls.objects.values('key')]:
  41             key = ''.join(random.choice(string.ascii_uppercase + string.ascii_lowercase + string.digits)
  42                           for i in range(30))
  43         return key
  44
  45     @classmethod
  46     def create(cls, first_name, last_name, email, key=None, contact=None):
  47         submission = cls(
  48             contact=contact,
  49             key=key if key else Submission.generate_key(),
  50             first_name=first_name,
  51             last_name=last_name,
  52             email=email
  53         )
  54
  55         submission.save()
  56         return submission
  57
  58     def get_mark(self, user_id, exercise_id):
  59         mark = None
  60         user_id = str(user_id)
  61         exercise_id = str(exercise_id)
  62         if self.marks and user_id in self.marks:
  63             mark = self.marks[user_id].get(exercise_id, None)
  64         return mark
  65
  66     def set_mark(self, user_id, exercise_id, mark):
  67         user_id = str(user_id)
  68         exercise_id = str(exercise_id)
  69         if not self.marks:
  70             self.marks = dict()
  71
  72         self.marks.setdefault(user_id, {})[exercise_id] = mark
  73         if mark == 'None':
  74             del self.marks[user_id][exercise_id]
  75
  76     def get_exercise_marks_by_examiner(self, exercise_id):
  77         marks = dict()
  78         for examiner_id, examiner_marks in self.marks.items():
  79             mark = examiner_marks.get(exercise_id, None)
  80             if mark is not None:
  81                 marks[examiner_id] = mark
  82         return marks
  83
  84     def get_final_exercise_mark(self, exercise_id):
  85         # exercise = exercises[int(exercise_id)-1]
  86         exercise = [e for e in exercises if str(e['id']) == str(exercise_id)][0]
  87         if exercise_checked_manually(exercise):
  88             marks_by_examiner = self.get_exercise_marks_by_examiner(exercise_id)
  89             if len(marks_by_examiner):
  90                 return sum(map(float, marks_by_examiner.values())) / float(len(marks_by_examiner))
  91             else:
  92                 return None
  93         else:
  94             if not self.answers:
  95                 return None
  96             answer = json.loads(self.answers)[exercise_id]['closed_part']
  97             t = exercise['type']
  98             if t == 'edumed_uporzadkuj':
  99                 return exercise['points'] if map(int, answer) == exercise['answer'] else 0
 100             if t == 'edumed_przyporzadkuj':
 101                 toret = 0
 102                 for bucket_id, items in answer.items():
 103                     for item_id in items:
 104                         is_corect = False
 105                         if exercise.get('answer_mode', None) == 'possible_buckets_for_item':
 106                             is_correct = int(bucket_id) in exercise['answer'].get(item_id)
 107                         else:
 108                             is_correct = int(item_id) in exercise['answer'].get(bucket_id, [])
 109                         if is_correct:
 110                             toret += exercise['points_per_hit']
 111                 return toret
 112             if t == 'edumed_wybor':
 113                 if len(exercise['answer']) == 1:
 114                     if len(answer) and int(answer[0]) == exercise['answer'][0]:
 115                         return exercise['points']
 116                     else:
 117                         return 0
 118                 else:
 119                     toret = 0
 120                     if exercise.get('answer_mode', None) == 'all_or_nothing':
 121                         toret = exercise['points'] if map(int, answer) == exercise['answer'] else 0
 122                     else:
 123                         for answer_id in map(int, answer):
 124                             if answer_id in exercise['answer']:
 125                                 toret += exercise['points_per_hit']
 126                     return toret
 127             if t == 'edumed_prawdafalsz':
 128                 toret = 0
 129                 for idx, statement in enumerate(exercise['statements']):
 130                     if answer[idx] == 'true':
 131                         given = True
 132                     elif answer[idx] == 'false':
 133                         given = False
 134                     else:
 135                         given = None
 136                     if given == statement[1]:
 137                         toret += exercise['points_per_hit']
 138                 return toret
 139             raise NotImplementedError
 140
 141     @property
 142     def final_result(self):
 143         final = 0
 144         # for exercise_id in map(str,range(1, len(exercises) + 1)):
 145         for exercise_id in [str(x['id']) for x in exercises]:
 146             mark = self.get_final_exercise_mark(exercise_id)
 147             if mark is not None:
 148                 final += mark
 149         return final
 150
 151     @property
 152     def final_result_as_string(self):
 153         return ('%.2f' % self.final_result).rstrip('0').rstrip('.')
 154
 155
 156 class Attachment(models.Model):
 157     submission = models.ForeignKey(Submission)
 158     exercise_id = models.IntegerField()
 159     tag = models.CharField(max_length=128, null=True, blank=True)
 160     file = models.FileField(upload_to='wtem/attachment')
 161
 162
 163 class Assignment(models.Model):
 164     user = models.ForeignKey(User, unique=True)
 165     exercises = JSONField()
 166
 167     def clean(self):
 168         if not isinstance(self.exercises, list):
 169             raise ValidationError(_('Assigned exercises must be declared in a list format'))
 170         # for exercise in self.exercises:
 171         #     if not isinstance(exercise, int) or exercise < 1:
 172         #         raise ValidationError(_('Invalid exercise id: %s' % exercise))
 173
 174     def __unicode__(self):
 175         return self.user.username + ': ' + ','.join(map(str, self.exercises))
 176
 177
 178 def exercise_checked_manually(exercise):
 179     return (exercise['type'] in ('open', 'file_upload')) or 'open_part' in exercise