abra at Thu Dec 27 13:44:21 +04 2018

web/models.py

@@ -26,14 +26,17 @@ class ActivityLog(models.Model):
   logged_at = models.DateTimeField(auto_now_add=True)
 
   def clean(self):
+    if self.start_time is None or self.end_time is None:
+      raise ValidationError(f'Не указано время: {self}')
+
     if self.start_time >= self.end_time:
-      raise ValidationError(f'Illegal times: {self}')
+      raise ValidationError(f'Некорректное время: {self}')
 
     for other_activity in ActivityLog.objects.filter(user=self.user).exclude(id=self.id):
       l = max(self.start_time, other_activity.start_time)
       r = min(self.end_time, other_activity.end_time)
       if r > l:
-        raise ValidationError(f'Intersects with another activity: \n{self}\n{other_activity}\n{l}, {r}')
+        raise ValidationError(f'Пересекается с другой активностью: \n{self}\n{other_activity}\n{l}, {r}')
 
   def __str__(self):
     return f'ActivityLog[{self.user}, {self.activity}] {self.start_time}-{self.end_time} ({self.end_time - self.start_time})'