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这是 South & 尝试设置新环境的问题。在我的所有应用程序上运行迁移时，我收到以下错误：

Traceback (most recent call last):
  File "/Users/emilepetrone/Sites/tindie2/lib/python2.7/site-packages/south/migration/migrators.py", line 175, in _run_migration
    migration_function()
  File "/Users/emilepetrone/Sites/tindie2/lib/python2.7/site-packages/south/migration/migrators.py", line 57, in <lambda>
    return (lambda: direction(orm))
  File "/Users/emilepetrone/Sites/tindie2/tindie/tindie/apps/seller/migrations/0001_initial.py", line 26, in forwards
    ('comments', self.gf('mezzanine.generic.fields.CommentsField')(object_id_field='object_pk', to=orm['generic.ThreadedComment'])),
  File "/Users/emilepetrone/Sites/tindie2/lib/python2.7/site-packages/south/db/generic.py", line 44, in _cache_clear
    return func(self, table, *args, **opts)
  File "/Users/emilepetrone/Sites/tindie2/lib/python2.7/site-packages/south/db/generic.py", line 343, in create_table
    for field_name, field in fields
  File "/Users/emilepetrone/Sites/tindie2/lib/python2.7/site-packages/south/db/generic.py", line 643, in column_sql
    field = self._field_sanity(field)
  File "/Users/emilepetrone/Sites/tindie2/lib/python2.7/site-packages/south/db/mysql.py", line 263, in _field_sanity
    type = self._db_type_for_alter_column(field).lower()
AttributeError: 'NoneType' object has no attribute 'lower'

这似乎是我上一次架构迁移或我的 models.py 中的某个问题。

在我的模型中，该字段看起来像（并且在迁移之间没有改变）：

from mezzanine.generic.fields import CommentsField

class MyClass(models.Model):
    comments = CommentsField(verbose_name=_("Comments"))

从迁移：

    'generic.threadedcomment': {
        'Meta': {'ordering': "('submit_date',)", 'object_name': 'ThreadedComment', '_ormbases': ['comments.Comment']},
        'by_author': ('django.db.models.fields.BooleanField', [], {'default': 'False'}),
        'comment_ptr': ('django.db.models.fields.related.OneToOneField', [], {'to': "orm['comments.Comment']", 'unique': 'True', 'primary_key': 'True'}),
        'replied_to': ('django.db.models.fields.related.ForeignKey', [], {'related_name': "'comments'", 'null': 'True', 'to': "orm['generic.ThreadedComment']"})
    },

我有点困惑，因为这个字段在迁移之间没有改变，而且夹层也没有改变。提前感谢您的想法。

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1 回答 1

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据我所知，问题在于 Mezzazine 的extendsCommentsField和GenericRelationreturn ，因为它是 Django 的语法糖，并且该字段在模式中没有列表示，但 South 仍在尝试生成SQL 语句并尝试设置通过有效地调用列类型，这就是你得到异常的原因。GenericRelation.db_type()NoneALTER TABLENone.lower()

这似乎是一个如此明显的错误，很可能我的理解完全不正确，但据我所知，您应该能够手动编辑 South 生成的迁移脚本并删除对作为新列添加的通用关系字段的任何引用。

于 2012-08-13T10:44:27.423 回答