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OpenStack Study: 028_fixup_group_metadata.py

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def upgrade(migrate_engine):

# The group_project_metadata table was not updated in terms of its

# FK to the tenant table when the tenant->project change was made at

# the 015 migration for sqlite. This upgrade fixes that.

# We need to create a fake tenant table so that we can first load

# the group_project_metadata at all, then do a dance of copying tables

# to get us to the correct schema.

meta = sql.MetaData()

meta.bind = migrate_engine

if migrate_engine.name != 'sqlite':

return

temp_tenant_table = sql.Table(

'tenant',

meta,

sql.Column('id', sql.String(64), primary_key=True))

temp_tenant_table.create(migrate_engine, checkfirst=True)

sql.Table('user', meta, autoload=True)

old_group_metadata_table = sql.Table('group_project_metadata',

meta, autoload=True)

# OK, we now have the table loaded, create a first

# temporary table of a different name with the correct FK

sql.Table('project', meta, autoload=True)

temp_group_project_metadata_table = sql.Table(

'temp_group_project_metadata',

sql.ForeignKey('project.id'),

primary_key=True),

sql.Column('data', sql.Text()))

temp_group_project_metadata_table.create(migrate_engine, checkfirst=True)

# Populate the new temporary table, and then drop the old one

session = sql.orm.sessionmaker(bind=migrate_engine)()

for metadata in session.query(old_group_metadata_table):

q = temp_group_project_metadata_table.insert().values(

group_id=metadata.group_id,

project_id=metadata.project_id,

data=metadata.data)

session.execute(q)

session.commit()

old_group_metadata_table.drop()

temp_tenant_table.drop()

# Now do a final table copy to get the table of the right name.

# Re-init the metadata so that sqlalchemy does not get confused with

# multiple versions of the same named table.

meta2 = sql.MetaData()

meta2.bind = migrate_engine

sql.Table('project', meta2, autoload=True)

new_group_project_metadata_table = sql.Table(

'group_project_metadata',

sql.ForeignKey('project.id'),

primary_key=True),

sql.Column('data', sql.Text()))

new_group_project_metadata_table.create(migrate_engine, checkfirst=True)

for metadata in session.query(temp_group_project_metadata_table):

q = new_group_project_metadata_table.insert().values(

group_id=metadata.group_id,

project_id=metadata.project_id,

data=metadata.data)

session.execute(q)

session.commit()

temp_group_project_metadata_table.drop()

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def downgrade(migrate_engine):

# Put the group_project_metadata table back the way it was in its rather

# broken state. We don't try and re-write history, since otherwise people

# get out of step.

meta = sql.MetaData()

meta.bind = migrate_engine

if migrate_engine.name != 'sqlite':

return

sql.Table('user', meta, autoload=True)

sql.Table('project', meta, autoload=True)

group_metadata_table = sql.Table('group_project_metadata',

meta, autoload=True)

# We want to create a temp group meta table with the FK

# set to the wrong place.

temp_tenant_table = sql.Table(

'tenant',

meta,

sql.Column('id', sql.String(64), primary_key=True))

temp_tenant_table.create(migrate_engine, checkfirst=True)

temp_group_project_metadata_table = sql.Table(

'temp_group_project_metadata',

sql.ForeignKey('tenant.id'),

primary_key=True),

sql.Column('data', sql.Text()))

temp_group_project_metadata_table.create(migrate_engine, checkfirst=True)

# Now populate the temp table and drop the real one

session = sql.orm.sessionmaker(bind=migrate_engine)()

for metadata in session.query(group_metadata_table):

q = temp_group_project_metadata_table.insert().values(

group_id=metadata.group_id,

project_id=metadata.project_id,

data=metadata.data)

session.execute(q)

session.commit()

group_metadata_table.drop()

# Now copy again into the correctly named table. Re-init the metadata

# so that sqlalchemy does not get confused with multiple versions of the

# same named table.

meta2 = sql.MetaData()

meta2.bind = migrate_engine

sql.Table('tenant', meta2, autoload=True)

new_group_project_metadata_table = sql.Table(

'group_project_metadata',

sql.ForeignKey('tenant.id'),

primary_key=True),

sql.Column('data', sql.Text()))

new_group_project_metadata_table.create(migrate_engine, checkfirst=True)

for metadata in session.query(temp_group_project_metadata_table):

q = new_group_project_metadata_table.insert().values(

group_id=metadata.group_id,

project_id=metadata.project_id,

data=metadata.data)

session.execute(q)

session.commit()

temp_group_project_metadata_table.drop()

temp_tenant_table.drop()