Resolve "Celery tasks are not working properly"

Closes #37 (closed)

aleksis/apps/untis/commands.py

@@ -32,7 +32,7 @@ class ImportCommand:
         if background:
             from .tasks import TASKS
 
-            task = TASKS[cls]
+            task = TASKS[cls.task_name]
             task.delay()
         else:
             _untis_import_mysql(cls.get_terms())
@@ -90,3 +90,4 @@ class CurrentFutureImportCommand(ImportCommand):
 
 
 COMMANDS_BY_NAME = {c.name: c for c in ImportCommand.__subclasses__()}
+COMMANDS_BY_TASK_NAME = {c.task_name: c for c in ImportCommand.__subclasses__()}