[英]Running a standalone script doing a model query in Django with `settings/dev.py` instead of `settings.py`
Note the settings/dev.py
instead of one settings.py
file and the script.py
in my_app
in the following Django(1.4.3) project: 请注意以下Django(1.4.3)项目中的
settings/dev.py
而不是一个settings.py
文件和my_app
中的script.py
:
.
├── my_project
│ ├── my_app
│ │ ├── __init__.py
│ │ ├── models.py
│ │ ├── tests.py
│ │ ├── views.py
│ │ └── script.py
│ ├── __init__.py
│ ├── settings
│ │ ├── dev.py
│ │ ├── __init__.py
│ │ └── prod.py
│ ├── urls.py
│ └── wsgi.py
├── manage.py
└── requirements.txt
When I only had one settings.py
file in place of the settings folder I was able to run the following script without any errors : 当我只有一个
settings.py
文件代替settings文件夹时,我能够运行以下脚本而没有任何错误 :
script.py: script.py:
###################################################################
# set up for making it possible to run a model query from my script.
###################################################################
import os
import sys
sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), os.path.pardir)))
from django.core.management import setup_environ
import settings
setup_environ(settings)
####################################################################
from my_app.models import MyModel
all_entries = MyModel.objects.all()
Btw, I got that from the second approach in this article , my setup is a few lines longer because my script.py
is in the my_app
folder instead of directly under the my_project
folder. 顺便说一句,我得到了在第二种方法这篇文章中 ,我的设置是几线长,因为我
script.py
是在my_app
文件夹,而不是直属my_project
文件夹。
Because I am now using settings/dev.py instead
of settings.py
I changed the last two lines of my setup in my script to the following: 因为我现在使用
settings/dev.py instead
settings.py
所以在我的脚本中将我的设置的最后两行更改为以下内容:
import settings.dev
import setup_environ(settings.dev)
But when I run my script now I get this error: 但是,当我现在运行我的脚本时,我收到此错误:
Traceback (most recent call last):
File "my_script.py", line 12, in <module>
all_entries = MyModel.objects.all()
File "/home/my_username/.virtualenvs/my_project/local/lib/python2.7/site-packages/django/db/models/manager.py", line 131, in get
return self.get_query_set().get(*args, **kwargs)
File "/home/my_username/.virtualenvs/my_project/local/lib/python2.7/site-packages/django/db/models/query.py", line 358, in get
clone = self.filter(*args, **kwargs)
File "/home/my_username/.virtualenvs/my_project/local/lib/python2.7/site-packages/django/db/models/query.py", line 624, in filter
return self._filter_or_exclude(False, *args, **kwargs)
File "/home/my_username/.virtualenvs/my_project/local/lib/python2.7/site-packages/django/db/models/query.py", line 642, in _filter_or_exclude
clone.query.add_q(Q(*args, **kwargs))
File "/home/my_username/.virtualenvs/my_project/local/lib/python2.7/site-packages/django/db/models/sql/query.py", line 1250, in add_q
can_reuse=used_aliases, force_having=force_having)
File "/home/my_username/.virtualenvs/my_project/local/lib/python2.7/site-packages/django/db/models/sql/query.py", line 1122, in add_filter
process_extras=process_extras)
File "/home/my_username/.virtualenvs/my_project/local/lib/python2.7/site-packages/django/db/models/sql/query.py", line 1304, in setup_joins
field, model, direct, m2m = opts.get_field_by_name(name)
File "/home/my_username/.virtualenvs/my_project/local/lib/python2.7/site-packages/django/db/models/options.py", line 311, in get_field_by_name
cache = self.init_name_map()
File "/home/my_username/.virtualenvs/my_project/local/lib/python2.7/site-packages/django/db/models/options.py", line 341, in init_name_map
for f, model in self.get_all_related_m2m_objects_with_model():
File "/home/my_username/.virtualenvs/my_project/local/lib/python2.7/site-packages/django/db/models/options.py", line 429, in get_all_related_m2m_objects_with_model
cache = self._fill_related_many_to_many_cache()
File "/home/my_username/.virtualenvs/my_project/local/lib/python2.7/site-packages/django/db/models/options.py", line 443, in _fill_related_many_to_many_cache
for klass in get_models(only_installed=False):
File "/home/my_username/.virtualenvs/my_project/local/lib/python2.7/site-packages/django/db/models/loading.py", line 181, in get_models
self._populate()
File "/home/my_username/.virtualenvs/my_project/local/lib/python2.7/site-packages/django/db/models/loading.py", line 64, in _populate
self.load_app(app_name, True)
File "/home/my_username/.virtualenvs/my_project/local/lib/python2.7/site-packages/django/db/models/loading.py", line 86, in load_app
app_module = import_module(app_name)
File "/home/my_username/.virtualenvs/my_project/local/lib/python2.7/site-packages/django/utils/importlib.py", line 35, in import_module
__import__(name)
ImportError: No module named my_project.my_app
Why is this error occurring? 为什么会出现此错误? How can I run my script in Django with
settings/dev.py
instead of settings.py
? 如何使用
settings/dev.py
而不是settings.py
在Django中运行我的脚本?
If you're looking to just run a script in the django environment, then the simplest way to accomplish this is to create a ./manage.py
subcommand, like this 如果你想在django环境中运行一个脚本,那么最简单的方法是创建一个
./manage.py
子命令,就像这样
from django.core.management.base import BaseCommand
from my_app.models import MyModel
class Command(BaseCommand):
help = 'runs your code in the django environment'
def handle(self, *args, **options):
all_entries = MyModel.objects.all()
for entry in all_entries:
self.stdout.write('entry "%s"' % entry)
The docs are quite helpful with explaining this. 这些文档非常有助于解释这一点。
However, you can specify a settings file to run with using 但是,您可以指定要使用的设置文件
$ django-admin.py runserver --settings=settings.dev
which will run the test server using the settings in dev
however, I fear your problems are more deep seated than simply that. 然而,这将使用
dev
中的设置运行测试服务器,我担心你的问题比简单的问题更深入。 I wouldn't recommend ever changing the manage.py
file as this can lead to inconsistencies and future headaches. 我不建议更改
manage.py
文件,因为这可能导致不一致和未来的麻烦。
Note also that dev.py
should be a complete settings file if you are to do this. 另请注意,如果要执行此操作,
dev.py
应该是完整的设置文件。 I would personally recommend a structure like this: 我个人会推荐这样的结构:
|-settings
| |- __init__.py
| |- base.py
| |- dev.py
| |- prod.py
and keep all the general settings in your base.py
and change the first line of your dev.py
etc to something like 并保留
base.py
所有常规设置,并将dev.py
等的第一行更改为类似的内容
# settings/dev.py
from .base import *
DEBUG = True
...
If you're just looking to test things out, why not try 如果您只是想测试一下,为什么不试试
$ ./manage.py shell
or with your dev settings 或者使用开发设置
$ django-admin.py shell --settings=settings.dev
as this will set all the OS environment variables, settings.py
for you, and then you can test / debug with 因为这将为您设置所有OS环境变量
settings.py
,然后您可以测试/调试
>>> from my_app.models import MyModel
>>> all_entries = MyModel.objects.all()
>>> for entry in all_entries:
... print entry
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