Remove predecessor column from raw_template.

This column is never used. The logic to retrieve the previous template
for rollback is based on stack table's prev_template_id.

Change-Id: Ib0af21502d0cc94613b3963d6ccdeffbc8103f6b

1 files changed, 52 insertions, 0 deletions

diff --git a/heat/db/sqlalchemy/migrate_repo/versions/064_raw_template_predecessor.py b/heat/db/sqlalchemy/migrate_repo/versions/064_raw_template_predecessor.py
new file mode 100644
index 000000000..984a15252
--- /dev/null
+++ b/heat/db/sqlalchemy/migrate_repo/versions/064_raw_template_predecessor.py
@@ -0,0 +1,52 @@
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+import migrate
+import sqlalchemy
+
+from heat.db.sqlalchemy import utils as migrate_utils
+
+
+def upgrade(migrate_engine):
+    if migrate_engine.name == 'sqlite':
+        upgrade_sqlite(migrate_engine)
+        return
+
+    meta = sqlalchemy.MetaData()
+    meta.bind = migrate_engine
+
+    tmpl_table = sqlalchemy.Table('raw_template', meta, autoload=True)
+
+    # drop constraint
+    fkey = migrate.ForeignKeyConstraint(
+        columns=[tmpl_table.c.predecessor],
+        refcolumns=[tmpl_table.c.id],
+        name='predecessor_fkey_ref')
+    fkey.drop()
+    tmpl_table.c.predecessor.drop()
+
+
+def upgrade_sqlite(migrate_engine):
+    meta = sqlalchemy.MetaData()
+    meta.bind = migrate_engine
+
+    tmpl_table = sqlalchemy.Table('raw_template', meta, autoload=True)
+    ignorecols = [tmpl_table.c.predecessor.name]
+    new_template = migrate_utils.clone_table('new_raw_template',
+                                             tmpl_table,
+                                             meta, ignorecols=ignorecols)
+    # migrate stacks to new table
+    migrate_utils.migrate_data(migrate_engine,
+                               tmpl_table,
+                               new_template,
+                               skip_columns=['predecessor'])