10aedae86a32_add_outgoing_enum_va.py

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#
# Asterisk -- An open source telephony toolkit.
#
# Copyright (C) 2014, Jonathan Rose
#
# Jonathan R. Rose <[email protected]>
#
# See http://www.asterisk.org for more information about
# the Asterisk project. Please do not directly contact
# any of the maintainers of this project for assistance;
# the project provides a web site, mailing lists and IRC
# channels for your use.
#
# This program is free software, distributed under the terms of
# the GNU General Public License Version 2. See the LICENSE file
# at the top of the source tree.
#

"""Add Outgoing enum value to sippeers directmedia

Revision ID: 10aedae86a32
Revises: 5950038a6ead
Create Date: 2014-09-19 16:03:13.469436

"""

# revision identifiers, used by Alembic.
revision = '10aedae86a32'
down_revision = '5950038a6ead'

from alembic import op
from sqlalchemy.dialects.postgresql import ENUM
import sqlalchemy as sa

OLD_ENUM = ['yes', 'no', 'nonat', 'update']
NEW_ENUM = ['yes', 'no', 'nonat', 'update', 'outgoing']

old_type = sa.Enum(*OLD_ENUM, name='sip_directmedia_values')
new_type = sa.Enum(*NEW_ENUM, name='sip_directmedia_values_v2')

tcr = sa.sql.table('sippeers', sa.Column('directmedia', new_type,
 nullable=True))

def upgrade():
 context = op.get_context()

 # Upgrading to this revision WILL clear your directmedia values.
 if context.bind.dialect.name != 'postgresql':
 op.alter_column('sippeers', 'directmedia',
 type_=new_type,
 existing_type=old_type)
 else:
 enum = ENUM("yes", "no", "nonat", "update", "outgoing",
 name="sip_directmedia_values_v2")
 enum.create(op.get_bind(), checkfirst=False)

 op.execute('ALTER TABLE sippeers ALTER COLUMN directmedia TYPE'
 ' sip_directmedia_values_v2 USING'
 ' directmedia::text::sip_directmedia_values_v2')

 ENUM(name="sip_directmedia_values").drop(op.get_bind(), checkfirst=False)

def downgrade():
 context = op.get_context()

 op.execute(tcr.update().where(tcr.c.directmedia==u'outgoing')
 .values(directmedia=None))

 if context.bind.dialect.name != 'postgresql':
 op.alter_column('sippeers', 'directmedia',
 type_=old_type,
 existing_type=new_type)
 else:
 enum = ENUM("yes", "no", "nonat", "update",
 name="sip_directmedia_values")
 enum.create(op.get_bind(), checkfirst=False)

 op.execute('ALTER TABLE sippeers ALTER COLUMN directmedia TYPE'
 ' sip_directmedia_values USING'
 ' directmedia::text::sip_directmedia_values')

 ENUM(name="sip_directmedia_values_v2").drop(op.get_bind(),
 checkfirst=False)