From: Mike Bayer <mike_mp@zzzcomputing.com>
Date: Thu, 10 Dec 2015 17:15:23 +0000 (-0500)
Subject: - existing_server_default is not used to drop the previous
X-Git-Tag: rel_0_8_4~9
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8b8e2c4f27a23efda97f43a6994bfa7f039e53aa;p=thirdparty%2Fsqlalchemy%2Falembic.git

- existing_server_default is not used to drop the previous
schema type constraint; existing_type is.  I haven't checked to
see if this changed at some point but that's what the source code
right now says.
---

diff --git a/alembic/operations/ops.py b/alembic/operations/ops.py
index 29f749e5..839c2da2 100644
--- a/alembic/operations/ops.py
+++ b/alembic/operations/ops.py
@@ -1345,9 +1345,9 @@ class AlterColumnOp(AlterTableOp):
         and  :class:`~sqlalchemy.types.Enum` may also
         add or drop constraints which accompany those
         types on backends that don't support them natively.
-        The ``existing_server_default`` argument is
-        used in this case as well to remove a previous
-        constraint.
+        The ``existing_type`` argument is
+        used in this case to identify and remove a previous
+        constraint that was bound to the type object.
 
         :param table_name: string name of the target table.
         :param column_name: string name of the target column,