我有一个小型的网络应用程序（使用Postgres），我一直在Django Windows环境中开发，它工作正常。我现在正试图将它移到Redhat 6.8并且makemigrations失败了 我已经安装了Postgres并在Linux上创建了数据库。我创建了数据库new，因为我不需要Windows上的任何旧测试数据。我移动了所有文件（.pyc文件除外）。以下是我得到的错误。它似乎正在尝试访问尚未创建的表。 （它尚未创建，因为我还没有能够运行迁移（有点鸡/蛋范例）。注意，从我读过的内容，我还删除了除 init <之外的所有迁移文件/strong> .py。我已经和它搏斗了好几个小时。非常感谢任何帮助。 谢谢。
webtest2) [asilver@SDNAUTOS02 sdnlabs2]$ python manage.py makemigrations
Traceback (most recent call last):
File "manage.py", line 22, in <module>
execute_from_command_line(sys.argv)
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/core/management/
utility.execute()
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/core/management/
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/core/management/
self.execute(*args, **cmd_options)
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/core/management/
self.check()
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/core/management/
include_deployment_checks=include_deployment_checks,
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/core/management/
return checks.run_checks(**kwargs)
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/core/checks/regi
new_errors = check(app_configs=app_configs)
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/core/checks/urls
return check_resolver(resolver)
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/core/checks/urls
return check_method()
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/urls/resolvers.p
for pattern in self.url_patterns:
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/utils/functional
res = instance.__dict__[self.name] = self.func(instance)
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/urls/resolvers.p
patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/utils/functional
res = instance.__dict__[self.name] = self.func(instance)
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/urls/resolvers.p
return import_module(self.urlconf_name)
File "/usr/local/python2.7.14/lib/python2.7/importlib/__init__.py", line 37, in import_modul
__import__(name)
File "/home/asilver/pythonProjects/django/sdntest2/sdnweb/sdnlabs2/sdnlabs2/urls.py", line 24
url(r'^inventory/', include('inventory.urls')),
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/conf/urls/__init
urlconf_module = import_module(urlconf_module)
File "/usr/local/python2.7.14/lib/python2.7/importlib/__init__.py", line 37, in import_modul
__import__(name)
File "/home/asilver/pythonProjects/django/sdntest2/sdnweb/sdnlabs2/inventory/urls.py", line 3
from . import views
File "/home/asilver/pythonProjects/django/sdntest2/sdnweb/sdnlabs2/inventory/views.py", line
from .filters import *
File "/home/asilver/pythonProjects/django/sdntest2/sdnweb/sdnlabs2/inventory/filters.py", lin
class PerfvRtrOnlyFilter(django_filters.FilterSet):
File "/home/asilver/pythonProjects/django/sdntest2/sdnweb/sdnlabs2/inventory/filters.py", lin
choiceList = get_unique_choice_list(partial_query_set)
File "/home/asilver/pythonProjects/django/sdntest2/sdnweb/sdnlabs2/inventory/lib.py", line 20
y = set(querySet)
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/db/models/query.
self._fetch_all()
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/db/models/query.
self._result_cache = list(self._iterable_class(self))
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/db/models/query.
for row in compiler.results_iter(chunked_fetch=self.chunked_fetch):
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/db/models/sql/co
results = self.execute_sql(MULTI, chunked_fetch=chunked_fetch)
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/db/models/sql/co
raise original_exception
django.db.utils.ProgrammingError: relation "inventory_perfvrtronly" does not exist
LINE 1: SELECT "inventory_perfvrtronly"."topoName" FROM "inventory_p...
^
(webtest2) [asilver@SDNAUTOS02 sdnlabs2]$
答案 0 :(得分：0)
您的PerfvRtrOnlyFilter类正在尝试在类级别执行查询，这意味着即使首次导入该类也会运行它。这是在任何迁移可以运行之前。
您只需在方法或函数中进行任何数据库访问。
答案 1 :(得分：0)
我收到的两条建议似乎非常相似，所以我尝试了一下列出的说明。我无法超越上面的第二步。我取消注册了应用程序，然后尝试运行迁移，但这次出现了不同的错误。有什么建议吗？
Traceback (most recent call last):
File "manage.py", line 22, in <module>
execute_from_command_line(sys.argv)
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/core/management/__init__.py", line 364, in execute_from_command_line
utility.execute()
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/core/management/__init__.py", line 356, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/core/management/base.py", line 283, in run_from_argv
self.execute(*args, **cmd_options)
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/core/management/base.py", line 327, in execute
self.check()
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/core/management/base.py", line 359, in check
include_deployment_checks=include_deployment_checks,
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/core/management/commands/migrate.py", line 62, in _run_checks
issues.extend(super(Command, self)._run_checks(**kwargs))
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/core/management/base.py", line 346, in _run_checks
return checks.run_checks(**kwargs)
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/core/checks/registry.py", line 81, in run_checks
new_errors = check(app_configs=app_configs)
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/core/checks/urls.py", line 16, in check_url_config
return check_resolver(resolver)
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/core/checks/urls.py", line 26, in check_resolver
return check_method()
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/urls/resolvers.py", line 254, in check
for pattern in self.url_patterns:
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/utils/functional.py", line 35, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/urls/resolvers.py", line 405, in url_patterns
patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/utils/functional.py", line 35, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/urls/resolvers.py", line 398, in urlconf_module
return import_module(self.urlconf_name)
File "/usr/local/python2.7.14/lib/python2.7/importlib/__init__.py", line 37, in import_module
__import__(name)
File "/home/asilver/pythonProjects/django/sdntest2/sdnweb/sdnlabs2/sdnlabs2/urls.py", line 24, in <module>
url(r'^inventory/', include('inventory.urls')),
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/conf/urls/__init__.py", line 50, in include
urlconf_module = import_module(urlconf_module)
File "/usr/local/python2.7.14/lib/python2.7/importlib/__init__.py", line 37, in import_module
__import__(name)
File "/home/asilver/pythonProjects/django/sdntest2/sdnweb/sdnlabs2/inventory/urls.py", line 3, in <module>
from . import views
File "/home/asilver/pythonProjects/django/sdntest2/sdnweb/sdnlabs2/inventory/views.py", line 5, in <module>
from .tables import DeviceInstanceTable, PerfvRtrOnlyTable, HardwareTable
File "/home/asilver/pythonProjects/django/sdntest2/sdnweb/sdnlabs2/inventory/tables.py", line 3, in <module>
from .models import DeviceInstance, PerfvRtrOnly, Hardware
File "/home/asilver/pythonProjects/django/sdntest2/sdnweb/sdnlabs2/inventory/models.py", line 8, in <module>
class Hardware(models.Model):
File "/home/asilver/.virtualenvs/webtest2/lib/python2.7/site-packages/django/db/models/base.py", line 118, in __new__
"INSTALLED_APPS." % (module, name)
RuntimeError: Model class inventory.models.Hardware doesn't declare an explicit app_label and isn't in an application in INSTALLED_APPS.
以下是该类的代码：
class PerfvRtrOnlyFilter(django_filters.FilterSet):
deviceName = django_filters.ModelMultipleChoiceFilter(name='deviceName', label='Device', queryset=DeviceInstance.objects.all())
hardware = django_filters.ModelMultipleChoiceFilter(name='hardware', label='Hardware', queryset=Hardware.objects.all())
jdmVersion = django_filters.ModelMultipleChoiceFilter(name='jdmVersion', label='JDM Version', queryset=Software.objects.all().filter(component__function='hypervisor'))
vrtrVersion = django_filters.ModelMultipleChoiceFilter(name='vrtrVersion', label='vRTR Version', queryset=Software.objects.filter(component__function='vrtr'))
vrtr = django_filters.ModelMultipleChoiceFilter(name='vrtr', label='vRouter', queryset=Component.objects.filter(function='vrtr'))
jflow = django_filters.BooleanFilter(name='jflow', label='Jflow')
##################################################
# Mulitple Choice Filter for topoName
##################################################
partial_query_set = PerfvRtrOnly.objects.values_list('topoName')
choiceList = get_unique_choice_list(partial_query_set)
topoName = django_filters.MultipleChoiceFilter(choices=choiceList, label='Topology')
##################################################
# Mulitple Choice Filter for frameSize
##################################################
partial_query_set = PerfvRtrOnly.objects.values_list('frameSize')
choiceList = get_unique_choice_list(partial_query_set)
frameSize = django_filters.MultipleChoiceFilter(choices=choiceList, label='Frame Size')
##################################################
# Mulitple Choice Filter for Run Date
##################################################
partial_query_set = PerfvRtrOnly.objects.values_list('runDate')
choiceList = get_unique_choice_list(partial_query_set)
runDate = django_filters.MultipleChoiceFilter(choices=choiceList, label='Run Date')
##################################################
# Single Choice Filter for Bridging Technology
##################################################
partial_query_set = PerfvRtrOnly.objects.values_list('bridgeTech')
choiceList = get_unique_choice_list(partial_query_set)
bridgeTech = django_filters.ChoiceFilter(choices=choiceList, label='Bridge Tech')
##################################################
# Mulitple Choice Filter for Traffic Type
##################################################
partial_query_set = PerfvRtrOnly.objects.values_list('trafficType')
choiceList = get_unique_choice_list(partial_query_set)
trafficType = django_filters.MultipleChoiceFilter(choices=choiceList, label='Traffic Type')
class Meta:
model = PerfvRtrOnly
fields = ['qos', 'officialRun',]
以下是该功能的代码＆＃34; get_unique_choice_list＆＃34;它驻留在文件lib.py：
中#####################################################################################
# This function is used to create a choice list for a filter in filter.py
# querySet is a querySet object and it should only contain one field of the table
# There may be duplicate entries in that list and each item in the list is a tupple.
#####################################################################################
def get_unique_choice_list(querySet):
list_1= []
y = set(querySet)
for i in y:
list_1.append(i)
######################################################################################################
# At this point we have a list of tuples which is no good. Ultiimately we need a tuple of tuples...
# As show below in the example. An enumerated tuple
# If we print list_1 we have this at this point:
#In [38]: print list_1
# [(u'J1101',), (u'D1001',), (u'H1101',), (u'D1',), (u'G1',), (u'G1001',)]
######################################################################################################
list_2 = []
for i in list_1:
a = i[0]
list_2.append(a)
list_2.sort()
#######################################################################
# At this point we should have a list of topologies and no more tuples
# print list_2
# [u'J1101', u'D1001', u'H1101', u'D1', u'G1', u'G1001']
#######################################################################
#######################################################################
# We now need to create a list of tuples
#######################################################################
list_3 = []
for i in list_2:
new_item = (str(i),str(i))
list_3.append(new_item)
return list_3
答案 2 :(得分：0)
最后得到了这个，但需要蛮力才能做到这一点。我删除了django应用程序中的所有文件，并启动了一个新项目和应用程序。然后我添加了models.py文件并更新了settings.py文件。那时我运行了makemigrations，一切正常。最后，我将其余的文件重新添加到项目中，现在一切正常...至少现在。我们将看到下次更改模型时会发生什么，并再次发出makemigrations命令....
答案 3 :(得分：-1)
尝试：