django - 在 Django 测试期间加载夹具时出现 IntegrityError

Question

我正在加载一个用 dumpdata 创建的装置，并得到以下异常:

Problem installing fixture 'db_dump.json': Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/django/core/management/commands/loaddata.py", line 174, in handle
    obj.save(using=using)
  File "/usr/lib/python2.6/site-packages/django/core/serializers/base.py", line 165, in save
    models.Model.save_base(self.object, using=using, raw=True)
  File "/usr/lib/python2.6/site-packages/django/db/models/base.py", line 526, in save_base
    rows = manager.using(using).filter(pk=pk_val)._update(values)
  File "/usr/lib/python2.6/site-packages/django/db/models/query.py", line 491, in _update
    return query.get_compiler(self.db).execute_sql(None)
  File "/usr/lib/python2.6/site-packages/django/db/models/sql/compiler.py", line 869, in execute_sql
    cursor = super(SQLUpdateCompiler, self).execute_sql(result_type)
  File "/usr/lib/python2.6/site-packages/django/db/models/sql/compiler.py", line 735, in execute_sql
    cursor.execute(sql, params)
  File "/usr/lib/python2.6/site-packages/django/db/backends/sqlite3/base.py", line 234, in execute
    return Database.Cursor.execute(self, query, params)
IntegrityError: columns app_label, model are not unique

这是一个 sqlite3 后端。

更新:在这里使用自然键没有区别。

这是什么意思，为什么会发生？

Answer 1

显然，粗心大意的陷阱之一是在导出设备时必须排除内容类型。 (感谢在#django 上提供信息)。

要排除内容类型，请使用 -e运行 dumpdata 命令时的选项。

$./manage.py dumpdata -e contenttypes > initial_data.json