Add Command class. (#148) (#141) (#123) (#106)

2021-08-03 16:18:07 +08:00
parent 1e5a83c281
commit 6f5a9ab78c
8 changed files with 238 additions and 131 deletions
--- a/aerich/exceptions.py
+++ b/aerich/exceptions.py
@@ -2,3 +2,9 @@ class NotSupportError(Exception):
    """
    raise when features not support
    """
+
+
+class DowngradeError(Exception):
+    """
+    raise when downgrade error
+    """