問題加載的Django夾具：IntegrityError：（1062， 「爲鍵 'USER_ID' 重複條目 '4'」）

Question

我用下面的命令以生成2個夾具：

./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 

我已經得到下面的夾具命名user.json：

[ 
    { 
     "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": "foo@gmail.com", 
      "date_joined": "2010-09-27 21:57:45" 
     } 
    } 
] 

和以下夾具命名full.json：

[ 
    { 
     "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" 
     } 
    } 
] 

運行下面的命令（在任何順序）：

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

引發以下異常：

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'") 

上這是怎麼回事任何想法？我知道MySQL中的前向引用存在問題，但如果在包含外鍵的嵌入式設備之前安裝了ID爲4的用戶對象，那應該不會有問題，對嗎？

Answer 1

按阿肖克的評論，當我有同樣的問題，它是通過改變我的信號處理程序來檢查它是否處於「原始」模式，這顯然意味着一個夾具是運行解決加載：

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

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

Answer 2

Django的靜態裝置是一個ANTI-PATTERN，這就是你有這種問題的原因。我建議你使用一些爲你生成這個燈具的庫，包括ID自然。

我建議你Dynamic Dynamic Fixture