1.7.7

Released: March 14, 2022

bug

• [bug] [operations] Fixed issue where using Operations.create_table() in conjunction
  with a CheckConstraint that referred to table-bound
  Column objects rather than string expressions would be added to
  the parent table potentially multiple times, resulting in an incorrect DDL
  sequence. Pull request courtesy Nicolas CANIART.

  References: #1004

• [bug] [environment] The logging.fileConfig() line in env.py templates, which is used
  to setup Python logging for the migration run, is now conditional on
  Config.config_file_name not being None. Otherwise, the line
  is skipped as there is no default logging configuration present.

  References: #986

• [bug] [mssql] Fixed bug where an Operations.alter_column() operation would change
  a "NOT NULL" column to "NULL" by emitting an ALTER COLUMN statement that
  did not specify "NOT NULL". (In the absence of "NOT NULL" T-SQL was
  implicitly assuming "NULL"). An Operations.alter_column() operation
  that specifies Operations.alter_column.type should also
  specify include either Operations.alter_column.nullable or
  Operations.alter_column.existing_nullable to inform Alembic as
  to whether the emitted DDL should include "NULL" or "NOT NULL"; a warning
  is now emitted if this is missing under this scenario.

  References: #977