我有两个模型，每个模型都在相同名称的不同应用中：
class Vendor(models.Model):
name = models.CharField(max_length=200, blank=True, default='DEFAULT')
serial_num = models.CharField(max_length=200, blank=True)
class Node(models.Model):
name = models.CharField(max_length=200, blank=True)
persons = models.ForeignKey(Person, on_delete=models.SET_NULL, null=True)
当我尝试python3 manage.py makemigrations时，我会收到下面的冗长错误。我认为问题可能是迁移文件。因为Home具有Person的外键，0001_initial.py具有依赖('Person', '0007_auto_20180110_1827'),，并且我无法将serial_num列添加到Person。因此，我尝试删除位置列并重新添加位置列，然后收到以下错误，指出它无法识别列location。
如何解决此问题？另外，如果我需要提供有关该问题的更多信息，请与我们联系。
Traceback (most recent call last):
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/db/backends/utils.py", line 85, in _execute
return self.cursor.execute(sql, params)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/db/backends/sqlite3/base.py", line 303, in execute
return Database.Cursor.execute(self, query, params)
sqlite3.OperationalError: no such column: vendor_vendor.location
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "manage.py", line 15, in <module>
execute_from_command_line(sys.argv)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/core/management/__init__.py", line 371, in execute_from_command_line
utility.execute()
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/core/management/__init__.py", line 365, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/core/management/base.py", line 288, in run_from_argv
self.execute(*args, **cmd_options)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/core/management/base.py", line 332, in execute
self.check()
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/core/management/base.py", line 364, in check
include_deployment_checks=include_deployment_checks,
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/core/management/base.py", line 351, in _run_checks
return checks.run_checks(**kwargs)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/core/checks/registry.py", line 73, in run_checks
new_errors = check(app_configs=app_configs)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/core/checks/urls.py", line 40, in check_url_namespaces_unique
all_namespaces = _load_all_namespaces(resolver)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/core/checks/urls.py", line 57, in _load_all_namespaces
url_patterns = getattr(resolver, 'url_patterns', [])
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/utils/functional.py", line 36, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/urls/resolvers.py", line 536, in url_patterns
patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/utils/functional.py", line 36, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/urls/resolvers.py", line 529, in urlconf_module
return import_module(self.urlconf_name)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/importlib/__init__.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 994, in _gcd_import
File "<frozen importlib._bootstrap>", line 971, in _find_and_load
File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 678, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/QuikBikes/QuikBikes/urls.py", line 28, in <module>
path('node/', include('node.urls')),
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/urls/conf.py", line 34, in include
urlconf_module = import_module(urlconf_module)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/importlib/__init__.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 994, in _gcd_import
File "<frozen importlib._bootstrap>", line 971, in _find_and_load
File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 678, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/QuikBikes/node/urls.py", line 3, in <module>
from . import views
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/QuikBikes/node/views.py", line 9, in <module>
from .forms import AddNodeForm
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/QuikBikes/node/forms.py", line 7, in <module>
class AddNodeForm(forms.Form):
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/QuikBikes/node/forms.py", line 10, in AddNodeForm
for person in Vendor.objects.all():
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/db/models/query.py", line 272, in __iter__
self._fetch_all()
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/db/models/query.py", line 1179, in _fetch_all
self._result_cache = list(self._iterable_class(self))
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/db/models/query.py", line 54, in __iter__
results = compiler.execute_sql(chunked_fetch=self.chunked_fetch, chunk_size=self.chunk_size)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/db/models/sql/compiler.py", line 1063, in execute_sql
cursor.execute(sql, params)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/db/backends/utils.py", line 100, in execute
return super().execute(sql, params)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/db/backends/utils.py", line 68, in execute
return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/db/backends/utils.py", line 77, in _execute_with_wrappers
return executor(sql, params, many, context)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/db/backends/utils.py", line 85, in _execute
return self.cursor.execute(sql, params)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/db/utils.py", line 89, in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/db/backends/utils.py", line 85, in _execute
return self.cursor.execute(sql, params)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/db/backends/sqlite3/base.py", line 303, in execute
return Database.Cursor.execute(self, query, params)
django.db.utils.OperationalError: no such column: vendor_vendor.location
(QuikBikes) Karthiks-MacBook-Pro:QuikBikes karthikpullela$ python3 manage.py makemigrations
Traceback (most recent call last):
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/db/backends/utils.py", line 85, in _execute
return self.cursor.execute(sql, params)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/db/backends/sqlite3/base.py", line 303, in execute
return Database.Cursor.execute(self, query, params)
sqlite3.OperationalError: no such column: vendor_vendor.location
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "manage.py", line 15, in <module>
execute_from_command_line(sys.argv)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/core/management/__init__.py", line 371, in execute_from_command_line
utility.execute()
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/core/management/__init__.py", line 365, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/core/management/base.py", line 288, in run_from_argv
self.execute(*args, **cmd_options)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/core/management/base.py", line 332, in execute
self.check()
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/core/management/base.py", line 364, in check
include_deployment_checks=include_deployment_checks,
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/core/management/base.py", line 351, in _run_checks
return checks.run_checks(**kwargs)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/core/checks/registry.py", line 73, in run_checks
new_errors = check(app_configs=app_configs)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/core/checks/urls.py", line 40, in check_url_namespaces_unique
all_namespaces = _load_all_namespaces(resolver)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/core/checks/urls.py", line 57, in _load_all_namespaces
url_patterns = getattr(resolver, 'url_patterns', [])
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/utils/functional.py", line 36, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/urls/resolvers.py", line 536, in url_patterns
patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/utils/functional.py", line 36, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/urls/resolvers.py", line 529, in urlconf_module
return import_module(self.urlconf_name)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/importlib/__init__.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 994, in _gcd_import
File "<frozen importlib._bootstrap>", line 971, in _find_and_load
File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 678, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/QuikBikes/QuikBikes/urls.py", line 28, in <module>
path('node/', include('node.urls')),
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/urls/conf.py", line 34, in include
urlconf_module = import_module(urlconf_module)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/importlib/__init__.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 994, in _gcd_import
File "<frozen importlib._bootstrap>", line 971, in _find_and_load
File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 678, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/QuikBikes/node/urls.py", line 3, in <module>
from . import views
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/QuikBikes/node/views.py", line 9, in <module>
from .forms import AddNodeForm
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/QuikBikes/node/forms.py", line 7, in <module>
class AddNodeForm(forms.Form):
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/QuikBikes/node/forms.py", line 10, in AddNodeForm
for person in Vendor.objects.all():
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/db/models/query.py", line 272, in __iter__
self._fetch_all()
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/db/models/query.py", line 1179, in _fetch_all
self._result_cache = list(self._iterable_class(self))
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/db/models/query.py", line 54, in __iter__
results = compiler.execute_sql(chunked_fetch=self.chunked_fetch, chunk_size=self.chunk_size)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/db/models/sql/compiler.py", line 1063, in execute_sql
cursor.execute(sql, params)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/db/backends/utils.py", line 100, in execute
return super().execute(sql, params)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/db/backends/utils.py", line 68, in execute
return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/db/backends/utils.py", line 77, in _execute_with_wrappers
return executor(sql, params, many, context)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/db/backends/utils.py", line 85, in _execute
return self.cursor.execute(sql, params)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/db/utils.py", line 89, in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/db/backends/utils.py", line 85, in _execute
return self.cursor.execute(sql, params)
File "/Users/karthikpullela/Desktop/Django-projects/QuikBikes/lib/python3.6/site-packages/django/db/backends/sqlite3/base.py", line 303, in execute
return Database.Cursor.execute(self, query, params)
django.db.utils.OperationalError: no such column: vendor_vendor.location
编辑：这是节点的forms.py。
from django import forms
from django.contrib.auth.models import User, Group
from vendor.models import Vendor
class AddNodeForm(forms.Form):
VENDOR_CHOICES = [('none', '---------')]
for person in Vendor.objects.all():
VENDOR_CHOICES.append((person, person))
node_vendor = forms.ChoiceField(label='Vendor', choices=VENDOR_CHOICES)
答案 0 :(得分：1)
您正在执行查询的AddNodeForm中的类级别有一些代码。由于该代码在导入时被调用，因此在迁移甚至可能有机会运行之前执行它。
您不应该在该级别进行查询 - 或者确实是任何重要的逻辑。这样的事情应该在方法中。