Only one assignment record per user

[edumed.git] / wtem / models.py

diff --git a/wtem/models.py b/wtem/models.py
index 5cb7096..9e67ad8 100644 (file)
--- a/wtem/models.py
+++ b/wtem/models.py
@@ -2,6 +2,10 @@ import random
 import string
 
 from django.db import models
+from django.contrib.auth.models import User
+from django.core.exceptions import ValidationError
+from django.utils.translation import ugettext as _
+from jsonfield import JSONField
 
 from contact.models import Contact
 
@@ -15,11 +19,12 @@ class Submission(models.Model):
     last_name = models.CharField(max_length = 100)
     email = models.EmailField(max_length = 100, unique = True)
     answers = models.CharField(max_length = 65536, null = True, blank = True)
+    key_sent = models.BooleanField(default = False)
 
     @classmethod
     def generate_key(cls):
         key = ''
-        while not key and key in [record['key'] for record in cls.objects.values('key')]:
+        while not key or key in [record['key'] for record in cls.objects.values('key')]:
             key = ''.join(random.choice(string.ascii_uppercase + string.ascii_lowercase + string.digits) for i in range(30))
         return key
 
@@ -40,4 +45,16 @@ class Submission(models.Model):
 class Attachment(models.Model):
     submission = models.ForeignKey(Submission)
     name = models.CharField(max_length=100)
-    file = models.FileField(upload_to = 'wtem/attachment')
\ No newline at end of file
+    file = models.FileField(upload_to = 'wtem/attachment')
+
+
+class Assignment(models.Model):
+    user = models.ForeignKey(User, unique = True)
+    exercises = JSONField()
+
+    def clean(self):
+        if not isinstance(self.exercises, list):
+            raise ValidationError(_('Assigned exercises must be declared in a list format'))
+        for exercise in self.exercises:
+            if not isinstance(exercise, int) or exercise < 1:
+                raise ValidationError(_('Invalid exercise id: %s' % exercise))