Use type_ of None in DropConstraintOp for a generic constraint

Per review comment.

diff --git a/alembic/operations/ops.py b/alembic/operations/ops.py
index 5c28e935fbe55fb8ad53b5fe1c2e4cff0642d6ee..8acff783a9f53c698569740ec8d665ab8f21200b 100644 (file)
--- a/alembic/operations/ops.py
+++ b/alembic/operations/ops.py
@@ -171,7 +171,7 @@ class DropConstraintOp(MigrateOperation):
             sqla_compat.constraint_name_or_none(constraint.name),
             constraint_table.name,
             schema=constraint_table.schema,
-            type_=types.get(constraint.__visit_name__, "generic"),
+            type_=types.get(constraint.__visit_name__),
             _reverse=AddConstraintOp.from_constraint(constraint),
         )