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14
15 """standardattributes migration
16
17 Revision ID: 8a6d8bdae39
18 Revises: 1b294093239c
19 Create Date: 2015-09-10 03:12:04.012457
20
21 """
22
23 # revision identifiers, used by Alembic.
24 revision = '8a6d8bdae39'
25 down_revision = '1b294093239c'
26 depends_on = ('32e5974ada25',)
27
28 from alembic import op
29 import sqlalchemy as sa
30
31
32 # basic model of the tables with required field for migration
33 TABLES = ('ports', 'networks', 'subnets', 'subnetpools', 'securitygroups',
34           'floatingips', 'routers', 'securitygrouprules')
35 TABLE_MODELS = [
36     (table, sa.Table(table, sa.MetaData(),
37                      sa.Column('id', sa.String(length=36), nullable=False),
38                      sa.Column('standard_attr_id', sa.BigInteger(),
39                                nullable=True)))
40     for table in TABLES
41 ]
42
43 standardattrs = sa.Table(
44     'standardattributes', sa.MetaData(),
45     sa.Column('id', sa.BigInteger(), primary_key=True, autoincrement=True),
46     sa.Column('resource_type', sa.String(length=255), nullable=False))
47
48
49 def upgrade():
50     generate_records_for_existing()
51     for table, model in TABLE_MODELS:
52         # add constraint(s) now that everything is populated on that table.
53         # note that some MariaDB versions will *not* allow the ALTER to
54         # NOT NULL on a column that has an FK constraint, so we set NOT NULL
55         # first, then the FK constraint.
56         op.alter_column(table, 'standard_attr_id', nullable=False,
57                         existing_type=sa.BigInteger(), existing_nullable=True,
58                         existing_server_default=False)
59         op.create_foreign_key(
60             constraint_name=None, source_table=table,
61             referent_table='standardattributes',
62             local_cols=['standard_attr_id'], remote_cols=['id'],
63             ondelete='CASCADE')
64         op.create_unique_constraint(
65             constraint_name='uniq_%s0standard_attr_id' % table,
66             table_name=table, columns=['standard_attr_id'])
67
68
69 def generate_records_for_existing():
70     session = sa.orm.Session(bind=op.get_bind())
71     values = []
72     with session.begin(subtransactions=True):
73         for table, model in TABLE_MODELS:
74             for row in session.query(model):
75                 # NOTE(kevinbenton): without this disabled, pylint complains
76                 # about a missing 'dml' argument.
77                 #pylint: disable=no-value-for-parameter
78                 res = session.execute(
79                     standardattrs.insert().values(resource_type=table))
80                 session.execute(
81                     model.update().values(
82                         standard_attr_id=res.inserted_primary_key).where(
83                             model.c.id == row[0]))
84     # this commit is necessary to allow further operations
85     session.commit()
86     return values