Python Django-Foreman找不到已安装的模型

我正在尝试使用/来管理基于Procfile的Django应用程序。当我启动应用程序查看正常的

python manage.py运行服务器时，一切正常。但是，当我通过
honcho start
或
foreman start web
启动应用程序时，我收到以下错误：

11:59:31 system | web.1 started (pid=27959)
11:59:31 web.1  | [2016-04-26 11:59:31 -0700] [27959] [INFO] Starting gunicorn 19.4.5
11:59:31 web.1  | [2016-04-26 11:59:31 -0700] [27959] [INFO] Listening at: http://0.0.0.0:5000 (27959)
11:59:31 web.1  | [2016-04-26 11:59:31 -0700] [27959] [INFO] Using worker: sync
11:59:31 web.1  | [2016-04-26 11:59:31 -0700] [27962] [INFO] Booting worker with pid: 27962
11:59:31 web.1  | [2016-04-26 18:59:31 +0000] [27962] [ERROR] Exception in worker process:
11:59:31 web.1  | Traceback (most recent call last):
11:59:31 web.1  |   File "/Library/Python/2.7/site-packages/gunicorn/arbiter.py", line 515, in spawn_worker
11:59:31 web.1  |     worker.init_process()
11:59:31 web.1  |   File "/Library/Python/2.7/site-packages/gunicorn/workers/base.py", line 122, in init_process
11:59:31 web.1  |     self.load_wsgi()
11:59:31 web.1  |   File "/Library/Python/2.7/site-packages/gunicorn/workers/base.py", line 130, in load_wsgi
11:59:31 web.1  |     self.wsgi = self.app.wsgi()
11:59:31 web.1  |   File "/Library/Python/2.7/site-packages/gunicorn/app/base.py", line 67, in wsgi
11:59:31 web.1  |     self.callable = self.load()
11:59:31 web.1  |   File "/Library/Python/2.7/site-packages/gunicorn/app/wsgiapp.py", line 65, in load
11:59:31 web.1  |     return self.load_wsgiapp()
11:59:31 web.1  |   File "/Library/Python/2.7/site-packages/gunicorn/app/wsgiapp.py", line 52, in load_wsgiapp
11:59:31 web.1  |     return util.import_app(self.app_uri)
11:59:31 web.1  |   File "/Library/Python/2.7/site-packages/gunicorn/util.py", line 357, in import_app
11:59:31 web.1  |     __import__(module)
11:59:31 web.1  |   File "../wsgi.py", line 17, in <module>
11:59:31 web.1  |     application = get_wsgi_application()
11:59:31 web.1  |   File "/Library/Python/2.7/site-packages/django/core/wsgi.py", line 13, in get_wsgi_application
11:59:31 web.1  |     django.setup()
11:59:31 web.1  |   File "/Library/Python/2.7/site-packages/django/__init__.py", line 18, in setup
11:59:31 web.1  |     apps.populate(settings.INSTALLED_APPS)
11:59:31 web.1  |   File "/Library/Python/2.7/site-packages/django/apps/registry.py", line 85, in populate
11:59:31 web.1  |     app_config = AppConfig.create(entry)
11:59:31 web.1  |   File "/Library/Python/2.7/site-packages/django/apps/config.py", line 90, in create
11:59:31 web.1  |     module = import_module(entry)
11:59:31 web.1  |   File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/importlib/__init__.py", line 37, in import_module
11:59:31 web.1  |     __import__(name)
11:59:31 web.1  | ImportError: No module named django_messages
11:59:31 web.1  | [2016-04-26 18:59:31 +0000] [27962] [INFO] Worker exiting (pid: 27962)
11:59:31 web.1  | [2016-04-26 11:59:31 -0700] [27959] [INFO] Shutting down: Master
11:59:31 web.1  | [2016-04-26 11:59:31 -0700] [27959] [INFO] Reason: Worker failed to boot.
11:59:31 system | web.1 stopped (rc=3)

已安装的应用程序

INSTALLED_APPS = (
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'my_app',
    'django_messages',
)

我不确定我还能提供什么其他信息来帮助排除故障，但基本问题是如何让安装的应用程序与foreman/honcho一起工作？
honcho和foreman不使用virtualenv中的Python可执行文件和libs，虽然您没有包含honcho proc文件，只需调用
python
即可使用系统范围的可执行文件和libs

不幸的是，您不能在Procfile中调用
/path/to/virtualenv/bin/activate
，因为Honcho会在其中一个子流程退出时退出，如前所述。但是，您可以在一个子shell中执行此脚本和python脚本，使用
&&
操作符将它们链接在一起：

web: source venv/bin/activate && python manage.py 

或者，在导入Django应用程序之前，您可能会更幸运地修改
wsgi.py
包装器，以显式地拉入virtualenv的库：

# Activate your virtual env
activate_env=os.path.expanduser("/path/to/virtualenv/bin/activate_this.py")
execfile(activate_env, dict(__file__=activate_env))

在导入任何模块（除
os
）之前，应执行这些操作，以确保应用程序读取正确的站点库

最后，Honcho本身支持在Procfile旁边使用
.env
文件，Procfile用于设置进程运行的环境。此文件的格式与任何bash脚本相同。您可以使用.env文件将
PYTHONPATH
和
PYTHONHOME
设置为指向Virtualenv中的库，然后从proc文件中指定Virtualenv中的显式Python解释器

.env文件

PYTHONHOME=/path/to/virtualenv/lib/python2.7
PYTHONHOME=

您的控制台和
honcho
之间的Python实例似乎有所不同。你用virtualenv吗？我用。。我在virtualenv内部和停用的fwiw中都得到了相同的错误。我明白了。然后，
honcho
似乎使用了系统Python。同时，您可以在virtualenv one上安装库。您可能正在调用系统范围的
python
可执行文件（在/usr/local/python或任何位置），而不是virtualenv中安装了
django_消息的python
PYTHONHOME=/path/to/virtualenv/lib/python2.7
PYTHONHOME=