Python django cms：插件模型与其数据库表不同步

在将django cms从2.4.3版升级到3.0.11版（目前是3.0.12版）之后，我意识到一些模型与其数据库表“不同步”。例如：

class ProjectPagePluginModel(cmsPlugin):
    """
    CMS project plugin model.
    """
    project = models.ForeignKey(Project, on_delete=CASCADE)
    max_occurrences = models.PositiveIntegerField(default=0)

    def __unicode__(self):
        return self.get_plugin_name()




>>> ProjectPagePluginModel.objects.all()
Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "/var/www/cms/venv2.7.5.up/lib/python2.7/site-packages/django/db/models/query.py", line 71, in __repr__
    data = list(self[:REPR_OUTPUT_SIZE + 1])
  File "/var/www/cms/venv2.7.5.up/lib/python2.7/site-packages/django/db/models/query.py", line 96, in __iter__
    self._fetch_all()
  File "/var/www/cms/venv2.7.5.up/lib/python2.7/site-packages/django/db/models/query.py", line 857, in _fetch_all
    self._result_cache = list(self.iterator())
  File "/var/www/cms/venv2.7.5.up/lib/python2.7/site-packages/django/db/models/query.py", line 220, in iterator
    for row in compiler.results_iter():
  File "/var/www/cms/venv2.7.5.up/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 713, in results_iter
    for rows in self.execute_sql(MULTI):
  File "/var/www/cms/venv2.7.5.up/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 786, in execute_sql
    cursor.execute(sql, params)
  File "/var/www/cms/venv2.7.5.up/lib/python2.7/site-packages/django/db/backends/util.py", line 53, in execute
    return self.cursor.execute(sql, params)
  File "/var/www/cms/venv2.7.5.up/lib/python2.7/site-packages/django/db/utils.py", line 99, in __exit__
    six.reraise(dj_exc_type, dj_exc_value, traceback)
  File "/var/www/cms/venv2.7.5.up/lib/python2.7/site-packages/django/db/backends/util.py", line 53, in execute
    return self.cursor.execute(sql, params)
ProgrammingError: relation "project_projectpagepluginmodel" does not exist
LINE 1: ...ct_projectpagepluginmodel"."max_occurrences" FROM "project_p...

更新：manage.py也不迁移

更新2：

我迁移的某个步骤出错了，我找到了丢失的信息

首先，我进入postgresql shell以了解此插件信息的位置：

unicms2=> select * from information_schema.tables  where table_name like '%projectpage%';
 table_catalog | table_schema |            table_name            | table_type | self_referencing_column_name | reference_generation | user_defined_type_catalog | user_defined_type_schema | user_defined_type_name | is_insertable_into | is_typed | commit_action 
---------------+--------------+----------------------------------+------------+------------------------------+----------------------+---------------------------+--------------------------+------------------------+--------------------+----------+---------------
 unicms2       | public       | cmsplugin_projectpagepluginmodel | BASE TABLE |                              |                      |                           |                          |                        | YES                | NO       | 
(1 row)

unicms2=> select count(*) from cmsplugin_projectpagepluginmodel;
 count 
-------
 39180
(1 row)

然后，我进入django shell，使用[south][1]重命名该表

>>> from south.db import db
>>> db.rename_table('cmsplugin_projectpagepluginmodel', 'project_projectpagepluginmodel')

我原以为这会奏效，但后来我开始出现运行时错误：

ProgrammingError: relation "cmsplugin_projectpagepluginmodel" does not exist
LINE 1: ...in_projectpagepluginmodel"."max_occurrences" FROM "cmsplugin...

我找到了解决这个错误的方法。不知何故，正如我所说，数据库与ORM不同步——我认真地认为这与django cms 3的虚假升级有关

我必须按如下方式审查我的所有申请：

$ python manage.py dumpdata >> fixture.json
CommandError: Unable to serialize database: relation "staff_staffpluginmodel" does not exist
LINE 1: ..., "staff_staffpluginmodel"."max_occurrences" FROM "staff_sta..."
$ mv staff/migrations/ ~/migrations-BAK/staff_migrations
$ python manage.py shell
>> from south.models import MigrationHistory
>> MigrationHistory.objects.filter(app_name='staff').delete()
>> quit()
$ python manage.py schemamigration --initial staff
$ vim staff/migrations/0001_initial.py   # comment out every command within forwards() except of those which create "staff_staffpluginmodel"
$ python manage.py migrate staff
$ python manage.py dumpdata >> fixture.json 

$ python manage.py datamigration staff migrate --freeze staff
-> edit the created staff/migrations/XXX.py migration, with the customised forwards and backwards methods
$ python manage.py migrate staff
-> enjoy

如果最后一个命令出现任何其他错误，只需重复该过程，直到确定为止

当然，这可以通过djangoshell使用纯南方迁移来完成，而不是删除迁移文件和迁移历史。但是--auto参数使生活更轻松；-）

编辑->使用南方数据迁移的更干净的解决方案如下：

$ python manage.py dumpdata >> fixture.json
CommandError: Unable to serialize database: relation "staff_staffpluginmodel" does not exist
LINE 1: ..., "staff_staffpluginmodel"."max_occurrences" FROM "staff_sta..."
$ mv staff/migrations/ ~/migrations-BAK/staff_migrations
$ python manage.py shell
>> from south.models import MigrationHistory
>> MigrationHistory.objects.filter(app_name='staff').delete()
>> quit()
$ python manage.py schemamigration --initial staff
$ vim staff/migrations/0001_initial.py   # comment out every command within forwards() except of those which create "staff_staffpluginmodel"
$ python manage.py migrate staff
$ python manage.py dumpdata >> fixture.json 

$ python manage.py datamigration staff migrate --freeze staff
-> edit the created staff/migrations/XXX.py migration, with the customised forwards and backwards methods
$ python manage.py migrate staff
-> enjoy

重复上述代码段，直到不再出现编程错误