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OpenStack Study: 004_add_checksum.py**** CubicPower OpenStack Study **** def get_images_table(meta): """ Returns the Table object for the images table that corresponds to the images table definition of this version. """ images = Table('images', meta, Column('id', Integer(), primary_key=True, nullable=False), Column('name', String(255)), Column('disk_format', String(20)), Column('container_format', String(20)), Column('size', Integer()), Column('status', String(30), nullable=False), Column('is_public', Boolean(), nullable=False, default=False, index=True), Column('location', Text()), Column('created_at', DateTime(), nullable=False), Column('updated_at', DateTime()), Column('deleted_at', DateTime()), Column('deleted', Boolean(), nullable=False, default=False, index=True), Column('checksum', String(32)), mysql_engine='InnoDB', extend_existing=True) return images
**** CubicPower OpenStack Study **** def get_image_properties_table(meta): """ No changes to the image properties table from 002... """ (define_image_properties_table,) = from_migration_import( '002_add_image_properties_table', ['define_image_properties_table']) image_properties = define_image_properties_table(meta) return image_properties
**** CubicPower OpenStack Study **** def upgrade(migrate_engine): meta = MetaData() meta.bind = migrate_engine images = get_images_table(meta) checksum = Column('checksum', String(32)) checksum.create(images)
**** CubicPower OpenStack Study **** def downgrade(migrate_engine): meta = MetaData() meta.bind = migrate_engine images = get_images_table(meta) images.columns['checksum'].drop()
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