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Django の South で migrate したときに south.exceptions.GhostMigrations

migrate がなんかうまくいかない

コマンドは普通

python manage.py migrate --setting=settings...

例外がでた。同じ症状のが StackOverFlow にあったのではる
API Only - Stack Exchange

Traceback (most recent call last):
  File "manage.py", line 14, in <module>
    execute_manager(settings)
  File "/home/username/webapps/myproject/lib/python2.6/django/core/management/__init__.py", line 438, in execute_manager
    utility.execute()
  File "/home/username/webapps/myproject/lib/python2.6/django/core/management/__init__.py", line 379, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/username/webapps/myproject/lib/python2.6/django/core/management/base.py", line 191, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/home/username/webapps/myproject/lib/python2.6/django/core/management/base.py", line 220, in execute
    output = self.handle(*args, **options)
  File "/home/username/lib/python2.6/South-0.7.3-py2.6.egg/south/management/commands/migrate.py", line 105, in handle
    ignore_ghosts = ignore_ghosts,
  File "/home/username/lib/python2.6/South-0.7.3-py2.6.egg/south/migration/__init__.py", line 171, in migrate_app
    applied = check_migration_histories(applied, delete_ghosts, ignore_ghosts)
  File "/home/username/lib/python2.6/South-0.7.3-py2.6.egg/south/migration/__init__.py", line 88, in check_migration_histories
    raise exceptions.GhostMigrations(ghosts)
south.exceptions.GhostMigrations:

 ! These migrations are in the database but not on disk:
    <bodyguard: 0002_auto__add_field_asset_is_reserved__add_field_asset_is_created__add_fie>
    <bodyguard: 0003_auto__del_field_asset_is_reserved__add_field_asset_is_assigned>
 ! I'm not trusting myself; either fix this yourself by fiddling
 ! with the south_migrationhistory table, or pass --delete-ghost-migrations
 ! to South to have it delete ALL of these records (this may not be good).

これってなにかというと、要は MySQL とかに south_migrationhistory ってテーブルがあって、それを migration のたびにレコードを更新しているんだけどその database にはあって disk = migration file がないよって話。なんらかのかたちでこのエラーに遭遇したら、とりあえず警告にあるとおりに --delete-ghost-migrations してやれば解決する

python manage.py migrate --settings=settings... --delete-ghost-migrations

South はマジ便利、だけど銀の弾丸ではない

気をつけないといろいろハマりがち

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