Only one assignment record per user

[edumed.git] / wtem / models.py

diff --git a/wtem/models.py b/wtem/models.py
index 75fa0ba..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
 
@@ -41,4 +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))