keystone.common.sql.migrate_repo.versions.096_drop_role_name_constraint

Source code for keystone.common.sql.migrate_repo.versions.096_drop_role_name_constraint

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import migrate
import sqlalchemy as sql

_ROLE_TABLE_NAME = 'role'
_ROLE_NAME_COLUMN_NAME = 'name'


[docs]def upgrade(migrate_engine): meta = sql.MetaData() meta.bind = migrate_engine role_table = sql.Table(_ROLE_TABLE_NAME, meta, autoload=True) # NOTE(morganfainberg): the `role_name` unique constraint is not # guaranteed to be named 'ixu_role_name', so we need to search for the # correct constraint that only affects role_table.c.name and drop # that constraint. # # This is an idempotent change that reflects the fix to migration # 88 if the role_name unique constraint was not named consistently and # someone manually fixed the migrations / db without dropping the # old constraint. to_drop = None if migrate_engine.name == 'mysql': for c in role_table.indexes: if (c.unique and len(c.columns) == 1 and _ROLE_NAME_COLUMN_NAME in c.columns): to_drop = c break else: for c in role_table.constraints: if len(c.columns) == 1 and _ROLE_NAME_COLUMN_NAME in c.columns: to_drop = c break if to_drop is not None: migrate.UniqueConstraint(role_table.c.name, name=to_drop.name).drop()
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