0.8.1

Released: August 22, 2015

• [autogenerate] [feature] A custom EnvironmentContext.configure.process_revision_directives
  hook can now generate op directives within the UpgradeOps
  and DowngradeOps containers that will be generated as Python
  code even when the --autogenerate flag is False; provided that
  revision_environment=True, the full render operation will be run
  even in "offline" mode.

• [autogenerate] [bug] Repaired the render operation for the ops.AlterColumnOp object
  to succeed when the "existing_type" field was not present.

• [autogenerate] [bug] Fixed a regression 0.8 whereby the "multidb" environment template
  failed to produce independent migration script segments for the
  output template. This was due to the reorganization of the script
  rendering system for 0.8. To accommodate this change, the
  MigrationScript structure will in the case of multiple
  calls to MigrationContext.run_migrations() produce lists
  for the MigrationScript.upgrade_ops and
  MigrationScript.downgrade_ops attributes; each UpgradeOps
  and DowngradeOps instance keeps track of its own
  upgrade_token and downgrade_token, and each are rendered
  individually.

  References: #318

• [autogenerate] [feature] Implemented support for autogenerate detection of changes in the
  ondelete, onupdate, initially and deferrable
  attributes of ForeignKeyConstraint objects on
  SQLAlchemy backends that support these on reflection
  (as of SQLAlchemy 1.0.8 currently Postgresql for all four,
  MySQL for ondelete and onupdate only). A constraint object
  that modifies these values will be reported as a "diff" and come out
  as a drop/create of the constraint with the modified values.
  The fields are ignored for backends which don't reflect these
  attributes (as of SQLA 1.0.8 this includes SQLite, Oracle, SQL Server,
  others).

  References: #317