add sent notification status

migrations/versions/00xx_add_sent_notification_status.py

@@ -0,0 +1,60 @@
+"""empty message
+
+Revision ID: 00xx_add_sent_notification_status
+Revises: 0075_create_rates_table
+Create Date: 2017-04-24 16:55:20.731069
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '00xx_sent_notification_status'
+down_revision = '0075_create_rates_table'
+
+from alembic import op
+import sqlalchemy as sa
+
+enum_name = 'notify_status_type'
+tmp_name = 'tmp_' + enum_name
+
+old_options = (
+    'created',
+    'sending',
+    'delivered',
+    'pending',
+    'failed',
+    'technical-failure',
+    'temporary-failure',
+    'permanent-failure'
+)
+new_options = old_options + ('sent',)
+
+old_type = sa.Enum(*old_options, name=enum_name)
+new_type = sa.Enum(*new_options, name=enum_name)
+
+alter_str = 'ALTER TABLE {table} ALTER COLUMN status TYPE {enum} USING status::text::notify_status_type '
+
+def upgrade():
+    op.execute('ALTER TYPE {enum} RENAME TO {tmp_name}'.format(enum=enum_name, tmp_name=tmp_name))
+
+    new_type.create(op.get_bind())
+    op.execute(alter_str.format(table='notifications', enum=enum_name))
+    op.execute(alter_str.format(table='notification_history', enum=enum_name))
+
+    op.execute('DROP TYPE ' + tmp_name)
+
+
+def downgrade():
+    op.execute('ALTER TYPE {enum} RENAME TO {tmp_name}'.format(enum=enum_name, tmp_name=tmp_name))
+
+    # Convert 'sent' template into 'sending'
+    update_str = "UPDATE TABLE {table} SET status='sending' where status='sent'"
+
+    op.execute(update_str.format(table='notifications'))
+    op.execute(update_str.format(table='notification_history'))
+
+    old_type.create(op.get_bind())
+
+    op.execute(alter_str.format(table='notifications', enum=enum_name))
+    op.execute(alter_str.format(table='notification_history', enum=enum_name))
+
+    op.execute('DROP TYPE ' + tmp_name)