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在使用 sqlite 运行测试时升级到 django 1.4 后出现此错误：

Creating test database for alias 'default'...
Problem installing fixture '/home/devasia/pyserver/project/mysite/app/fixtures/test_data.json':        Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/django/core/management/commands/loaddata.py", line 196, in handle
obj.save(using=using)
File "/usr/local/lib/python2.7/dist-packages/django/core/serializers/base.py", line 165, in save
  models.Model.save_base(self.object, using=using, raw=True)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/base.py", line 529, in save_base
 rows = manager.using(using).filter(pk=pk_val)._update(values)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py", line 557, in _update
 return query.get_compiler(self.db).execute_sql(None)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/sql/compiler.py", line 986, in   execute_sql
cursor = super(SQLUpdateCompiler, self).execute_sql(result_type)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/sql/compiler.py", line 818, in execute_sql
cursor.execute(sql, params)
File "/usr/local/lib/python2.7/dist-packages/django/db/backends/sqlite3/base.py", line 337, in execute
return Database.Cursor.execute(self, query, params)
IntegrityError: Could not load auth.Permission(pk=31): columns content_type_id, codename are not unique


----------------------------------------------------------------------
Ran 1 test in 0.011s

OK
Destroying test database for alias 'default'...

这是我的示例测试用例：

class CheckTest(TestCase):
    fixtures = ['test_data.json']
    def test_check(self):
        c = Client()
        c.login(username = 'test', password = 'test')

固定装置不是旧版本的。我从 'syncdb' 命令开始使用 django 1.4 创建了这个夹具。如果我使用 postgresql 作为测试数据库，测试运行良好（测试运行速度非常慢）。升级时我错过了什么吗？我找到了这个https://code.djangoproject.com/ticket/14731但无法解决问题。（请注意，旧项目中唯一的代码/数据是模型）

谢谢

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