make token and last seen date in backend readonly

tkupek_elearning/elearning/admin.py

@@ -22,6 +22,11 @@ class UserAdmin(admin.ModelAdmin):
         UserAnswerInline,
     ]
 
+    def get_readonly_fields(self, request, obj=None):
+
+        return self.readonly_fields + ('token', 'last_seen')
+
+
 admin.site.register(Question, QuestionAdmin)
 admin.site.register(Setting),
 admin.site.register(User, UserAdmin)

tkupek_elearning/elearning/models.py

@@ -50,7 +50,7 @@ class User(models.Model):
 
     token = models.CharField(max_length=40, null=True, default=gen_token)
     name = models.CharField(max_length=100, null=False)
-    last_seen = models.DateTimeField(null=True)
+    last_seen = models.DateTimeField(null=True, blank=True)
 
     def __unicode__(self):
         return self.name