From ab59c1516e53888a17dc608950667b8ecfdee561 Mon Sep 17 00:00:00 2001
From: Pierre-Yves Chibon <pingou@pingoured.fr>
Date: May 31 2016 06:22:54 +0000
Subject: Add an alembic migration file to update the DB constraints


So that deleting a projects works even if it had been configured before

---

diff --git a/alembic/versions/317a285e04a8_delete_hooks.py b/alembic/versions/317a285e04a8_delete_hooks.py
new file mode 100644
index 0000000..2ee64e2
--- /dev/null
+++ b/alembic/versions/317a285e04a8_delete_hooks.py
@@ -0,0 +1,59 @@
+"""Delete hooks
+
+Revision ID: 317a285e04a8
+Revises: 2aa7b3958bc5
+Create Date: 2016-05-30 11:28:48.512577
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '317a285e04a8'
+down_revision = '2aa7b3958bc5'
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    """ Alter the hooks table to update the foreign key to cascade on delete.
+    """
+
+    for table in [
+            'hook_fedmsg', 'hook_irc', 'hook_mail',
+            'hook_pagure_force_commit', 'hook_pagure', 'hook_pagure_requests',
+            'hook_pagure_tickets', 'hook_pagure_unsigned_commit', 'hook_rtd',
+            ]:
+        op.drop_constraint(
+            '%s_project_id_fkey' % table,
+            table,
+            type_='foreignkey')
+        op. create_foreign_key(
+            name='%s_project_id_fkey' % table,
+            source_table=table,
+            referent_table='projects',
+            local_cols=['project_id'],
+            remote_cols=['id'],
+            onupdate='cascade',
+            ondelete='cascade',
+        )
+
+    op.drop_constraint(
+        'projects_groups_project_id_fkey',
+        'projects_groups',
+        type_='foreignkey')
+    op. create_foreign_key(
+        name='projects_groups_project_id_fkey',
+        source_table='projects_groups',
+        referent_table='projects',
+        local_cols=['project_id'],
+        remote_cols=['id'],
+        onupdate='cascade',
+        ondelete='cascade',
+    )
+
+
+
+def downgrade():
+    """ Alter the hooks table to update the foreign key to undo the cascade
+    on delete.
+    """