Django syncdb錯誤

Question

我在我安裝的應用程序中有django.contrib.auth，一切都在10分鐘前工作。我刪除了現有的數據庫，因爲我在南遷移時遇到了問題。當我嘗試重建它時，出現錯誤。

錯誤：django.db.utils.DatabaseError：沒有這樣的表：AUTH_USER

Traceback (most recent call last): 
    File "manage.py", line 11, in <module> 
    execute_manager(settings) 
    File "/usr/lib/python2.7/site-packages/django/core/management/__init__.py", line 438, in execute_manager 
    utility.execute() 
    File "/usr/lib/python2.7/site-packages/django/core/management/__init__.py", line 379, in execute 
    self.fetch_command(subcommand).run_from_argv(self.argv) 
    File "/usr/lib/python2.7/site-packages/django/core/management/base.py", line 191, in run_from_argv 
    self.execute(*args, **options.__dict__) 
    File "/usr/lib/python2.7/site-packages/django/core/management/base.py", line 219, in execute 
    self.validate() 
    File "/usr/lib/python2.7/site-packages/django/core/management/base.py", line 249, in validate 
    num_errors = get_validation_errors(s, app) 
    File "/usr/lib/python2.7/site-packages/django/core/management/validation.py", line 35, in get_validation_errors 
    for (app_name, error) in get_app_errors().items(): 
    File "/usr/lib/python2.7/site-packages/django/db/models/loading.py", line 146, in get_app_errors 
    self._populate() 
    File "/usr/lib/python2.7/site-packages/django/db/models/loading.py", line 61, in _populate 
    self.load_app(app_name, True) 
    File "/usr/lib/python2.7/site-packages/django/db/models/loading.py", line 78, in load_app 
    models = import_module('.models', app_name) 
    File "/usr/lib/python2.7/site-packages/django/utils/importlib.py", line 35, in import_module 
    __import__(name) 
    File "/home/bruk/workspace/hungryDroid/src/hungryDroid/Ingredient/models.py", line 22, in <module> 
    class Ingredient(models.Model): 
    File "/home/bruk/workspace/hungryDroid/src/hungryDroid/Ingredient/models.py", line 26, in Ingredient 
    FKowner = models.ForeignKey(User, default=User.objects.get(pk=1).id) 
    File "/usr/lib/python2.7/site-packages/django/db/models/manager.py", line 132, in get 
    return self.get_query_set().get(*args, **kwargs) 
    File "/usr/lib/python2.7/site-packages/django/db/models/query.py", line 342, in get 
    num = len(clone) 
    File "/usr/lib/python2.7/site-packages/django/db/models/query.py", line 80, in __len__ 
    self._result_cache = list(self.iterator()) 
    File "/usr/lib/python2.7/site-packages/django/db/models/query.py", line 271, in iterator 
    for row in compiler.results_iter(): 
    File "/usr/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 677, in results_iter 
    for rows in self.execute_sql(MULTI): 
    File "/usr/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 732, in execute_sql 
    cursor.execute(sql, params) 
    File "/usr/lib/python2.7/site-packages/django/db/backends/util.py", line 15, in execute 
    return self.cursor.execute(sql, params) 
    File "/usr/lib/python2.7/site-packages/django/db/backends/sqlite3/base.py", line 200, in execute 
    return Database.Cursor.execute(self, query, params) 
**django.db.utils.DatabaseError: no such table: auth_user** 

Answer 1

的問題是，你正在運行鍼對用戶模型

File "/home/bruk/workspace/hungryDroid/src/hungryDroid/Ingredient/models.py", line 26, in Ingredient 
FKowner = models.ForeignKey(User, default=User.objects.get(pk=1).id) 

查詢在syncdb進程（實際上在字段聲明期間，所以任何時候導入你的模塊，就像在驗證過程中一樣）。

這將確保在創建auth_user表之前執行auth_user查詢。

一個更安全的方式來獲得與默認用戶的功能就是做

def get_default_user(): 
    return User.objects.get(pk=1) 

，然後在現場報關，做

FKowner = models.ForeignKey(User, default=get_default_user) 

按照該model field reference缺省值可以是可調用的。請注意，如果您在那裏使用了get_default_user（），那麼您將有相同的問題 - 然後它立即執行，而不是按需執行。