python - 加载Django固定装置时出现问题: IntegrityError: (1062, "Duplicate entry ' 4' for key ' user_id'“)

我使用以下命令生成了2个灯具:

./manage.py dumpdata --format=json --indent=4 --natural auth.User > fixtures/user.json
./manage.py dumpdata --format=json --indent=4 --natural --exclude=contenttypes --exclude=auth > fixtures/full.json

我有以下名为user.json的装置:

[
    {
        "pk": 4,
        "model": "auth.user",
        "fields": {
            "username": "foo",
            "first_name": "Se\u00e1n",
            "last_name": "Hayes",
            "is_active": true,
            "is_superuser": true,
            "is_staff": true,
            "last_login": "2010-09-27 21:57:45",
            "groups": [],
            "user_permissions": [],
            "password": "!",
            "email": "[email protected]",
            "date_joined": "2010-09-27 21:57:45"
        }
    }
]

以及以下名为full.json的装置:

[
    {
        "pk": "72a75887b4a0ce06a61f9183fe1c0e15",
        "model": "sessions.session",
        "fields": {
            "expire_date": "2010-10-11 21:57:45",
            "session_data": "gAJ9cQEoVRJfYXV0aF91c2VyX2JhY2tlbmRxAlUOZmIuYXV0aC5GYkF1dGhxA1UNX2F1dGhfdXNl\ncl9pZHEEigEEdS5hOGZlODU0MmRjYmUwNmEzODIwNjhiYzYyODc2MWQxZA==\n"
        }
    },
    {
        "pk": 1,
        "model": "sites.site",
        "fields": {
            "domain": "example.com",
            "name": "example.com"
        }
    },
    {
        "pk": 2,
        "model": "common.userprofile",
        "fields": {
            "money": 10,
            "energy": 10,
            "experience": 0,
            "stamina": 10,
            "health": 10,
            "user": 4
        }
    },
    {
        "pk": 2,
        "model": "missions.missionprofile",
        "fields": {
            "user": 4,
            "last_area_viewed": null
        }
    },
    {
        "pk": 1,
        "model": "fb.facebookuser",
        "fields": {
            "updated": "2010-09-27 21:57:45",
            "uid": "24411841",
            "created": "2010-09-27 21:57:45",
            "access_token": "foo",
            "url": "http://www.facebook.com/profile.php?id=24411841",
            "user": 4,
            "img_url": null,
            "name": "Se\u00e1n Hayes"
        }
    }
]

运行以下命令(以任何顺序):

./manage.py loaddata user
./manage.py loaddata full

引发以下异常:

Problem installing fixture '/projectpath/fixtures/full.json': Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/django/core/management/commands/loaddata.py", line 169, in handle
    obj.save(using=using)
  File "/usr/lib/pymodules/python2.6/django/core/serializers/base.py", line 165, in save
    models.Model.save_base(self.object, using=using, raw=True)
  File "/usr/lib/pymodules/python2.6/django/db/models/base.py", line 528, in save_base
    result = manager._insert(values, return_id=update_pk, using=using)
  File "/usr/lib/pymodules/python2.6/django/db/models/manager.py", line 195, in _insert
    return insert_query(self.model, values, **kwargs)
  File "/usr/lib/pymodules/python2.6/django/db/models/query.py", line 1479, in insert_query
    return query.get_compiler(using=using).execute_sql(return_id)
  File "/usr/lib/pymodules/python2.6/django/db/models/sql/compiler.py", line 783, in execute_sql
    cursor = super(SQLInsertCompiler, self).execute_sql(None)
  File "/usr/lib/pymodules/python2.6/django/db/models/sql/compiler.py", line 727, in execute_sql
    cursor.execute(sql, params)
  File "/usr/lib/pymodules/python2.6/django/db/backends/util.py", line 15, in execute
    return self.cursor.execute(sql, params)
  File "/usr/lib/pymodules/python2.6/django/db/backends/mysql/base.py", line 86, in execute
    return self.cursor.execute(query, args)
  File "/usr/lib/pymodules/python2.6/MySQLdb/cursors.py", line 166, in execute
    self.errorhandler(self, exc, value)
  File "/usr/lib/pymodules/python2.6/MySQLdb/connections.py", line 35, in defaulterrorhandler
    raise errorclass, errorvalue
IntegrityError: (1062, "Duplicate entry '4' for key 'user_id'")

有什么想法吗？我知道MySQL中的前向引用存在问题，但是如果在包含外键的固定装置之前安装了ID为4的User对象没关系，对吗？

最佳答案

根据Ashok的评论，当我遇到相同的问题时，可以通过更改信号处理程序以检查其是否以“原始”模式运行来解决，这显然意味着正在加载灯具:

def create_user_profile(sender, instance, created, **kwargs):
    if created and not kwargs.get('raw', False):
        UserProfile.objects.create(user=instance)

参见How do I prevent fixtures from conflicting with django post_save signal code?