我有一个我在申请中使用的教师帐户。现在的问题是，我修改了一些东西，我无法弄清楚错误，因为当我尝试创建一个帐户时，我得到了这个错误：
IntegrityError at /admin/login/
(1062, "Duplicate entry '' for key 'email'")
Environment:
Request Method: GET
Request URL: http://127.0.0.1:8000/admin/login/?next=/admin/
Django Version: 2.0.1
Python Version: 3.6.2
Installed Applications:
['django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'courses']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware']
Traceback:
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\db\models\query.py" in get_or_create
487. return self.get(**lookup), False
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\db\models\query.py" in get
403. self.model._meta.object_name
During handling of the above exception (Student matching query does not exist.), another exception occurred:
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\db\backends\utils.py" in _execute
85. return self.cursor.execute(sql, params)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\db\backends\mysql\base.py" in execute
71. return self.cursor.execute(query, args)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\MySQLdb\cursors.py" in execute
250. self.errorhandler(self, exc, value)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\MySQLdb\connections.py" in defaulterrorhandler
50. raise errorvalue
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\MySQLdb\cursors.py" in execute
247. res = self._query(query)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\MySQLdb\cursors.py" in _query
411. rowcount = self._do_query(q)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\MySQLdb\cursors.py" in _do_query
374. db.query(q)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\MySQLdb\connections.py" in query
292. _mysql.connection.query(self, query)
The above exception ((1062, "Duplicate entry '' for key 'email'")) was the direct cause of the following exception:
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\core\handlers\exception.py" in inner
35. response = get_response(request)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\core\handlers\base.py" in _get_response
158. response = self.process_exception_by_middleware(e, request)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\core\handlers\base.py" in _get_response
156. response = response.render()
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\template\response.py" in render
106. self.content = self.rendered_content
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\template\response.py" in rendered_content
83. content = template.render(context, self._request)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\template\backends\django.py" in render
61. return self.template.render(context)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\template\base.py" in render
173. with context.bind_template(self):
File "c:\users\danny\appdata\local\programs\python\python36-32\Lib\contextlib.py" in __enter__
81. return next(self.gen)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\template\context.py" in bind_template
250. updates.update(processor(self.request))
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\eve\courses\context_processors.py" in notifications
5. if request.user.is_authenticated and request.user.student:
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\utils\functional.py" in inner
216. return func(self._wrapped, *args)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\eve\courses\models.py" in <lambda>
185. User.student = property(lambda p: Student.objects.get_or_create(user=p)[0])
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\db\models\manager.py" in manager_method
82. return getattr(self.get_queryset(), name)(*args, **kwargs)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\db\models\query.py" in get_or_create
489. return self._create_object_from_params(lookup, params)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\db\models\query.py" in _create_object_from_params
528. raise e
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\db\models\query.py" in _create_object_from_params
521. obj = self.create(**params)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\db\models\query.py" in create
417. obj.save(force_insert=True, using=self.db)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\db\models\base.py" in save
729. force_update=force_update, update_fields=update_fields)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\db\models\base.py" in save_base
759. updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\db\models\base.py" in _save_table
842. result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\db\models\base.py" in _do_insert
880. using=using, raw=raw)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\db\models\manager.py" in manager_method
82. return getattr(self.get_queryset(), name)(*args, **kwargs)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\db\models\query.py" in _insert
1125. return query.get_compiler(using=using).execute_sql(return_id)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\db\models\sql\compiler.py" in execute_sql
1281. cursor.execute(sql, params)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\db\backends\utils.py" in execute
100. return super().execute(sql, params)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\db\backends\utils.py" in execute
68. return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\db\backends\utils.py" in _execute_with_wrappers
77. return executor(sql, params, many, context)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\db\backends\utils.py" in _execute
85. return self.cursor.execute(sql, params)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\db\utils.py" in __exit__
89. raise dj_exc_value.with_traceback(traceback) from exc_value
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\db\backends\utils.py" in _execute
85. return self.cursor.execute(sql, params)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\django\db\backends\mysql\base.py" in execute
71. return self.cursor.execute(query, args)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\MySQLdb\cursors.py" in execute
250. self.errorhandler(self, exc, value)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\MySQLdb\connections.py" in defaulterrorhandler
50. raise errorvalue
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\MySQLdb\cursors.py" in execute
247. res = self._query(query)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\MySQLdb\cursors.py" in _query
411. rowcount = self._do_query(q)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\MySQLdb\cursors.py" in _do_query
374. db.query(q)
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\lib\site-packages\MySQLdb\connections.py" in query
292. _mysql.connection.query(self, query)
Exception Type: IntegrityError at /admin/login/
Exception Value: (1062, "Duplicate entry '' for key 'email'")
似乎错误来自于此：
from courses.models import Notification
def notifications(request):
if request.user.is_authenticated and request.user.student:
student_notifications = Notification.objects.filter(course__student__student_ID=request.user.student.student_ID)
return {
'notifications': student_notifications
}
return {}
答案 0 :(得分：5)
我会检查这一行。根据你的追踪，IntegrityError来自那里：
File "C:\Users\danny\Desktop\Projects\bachelor_thesis\eve\courses\models.py" in <lambda>
185. User.student = property(lambda p: Student.objects.get_or_create(user=p)[0])
它说"Duplicate entry '' for key 'email'"
第一个字符串''是数据库中的现有条目。
看起来像：
email字段设置为unique=True（可能blank=True）Student对象，其中包含空电子邮件（''）