升級到Django的1.7：獲得AppRegistryNotReady翻譯基礎設施

Question

我從Django的1.6升級到1.7，當我嘗試做manage.py runserver我得到以下跟蹤：

Traceback (most recent call last): 
    File "manage.py", line 9, in <module> 
    execute_from_command_line(sys.argv) 
    File "/home/ben/.virtualenvs/myproject/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 385, in execute_from_command_line 
    utility.execute() 
    File "/home/ben/.virtualenvs/myproject/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 354, in execute 
    django.setup() 
    File "/home/ben/.virtualenvs/myproject/local/lib/python2.7/site-packages/django/__init__.py", line 21, in setup 
    apps.populate(settings.INSTALLED_APPS) 
    File "/home/ben/.virtualenvs/myproject/local/lib/python2.7/site-packages/django/apps/registry.py", line 85, in populate 
    app_config = AppConfig.create(entry) 
    File "/home/ben/.virtualenvs/myproject/local/lib/python2.7/site-packages/django/apps/config.py", line 87, in create 
    module = import_module(entry) 
    File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module 
    __import__(name) 
    File "/home/ben/Code/Repos/myrepo/myproject/core/mail/__init__.py", line 6, in <module> 
    from myproject.core.mail.models import IMapEmailMessage, EmailStatus 
    File "/home/ben/Code/Repos/myrepo/myproject/core/mail/models.py", line 20, in <module> 
    from myproject.core.mail.utils import render_templates 
    File "/home/ben/Code/Repos/myrepo/myproject/core/mail/utils.py", line 19, in <module> 
    from myproject.core.util import clean_html 
    File "/home/ben/Code/Repos/myrepo/myproject/core/util.py", line 1031, in <module> 
    def make_url(url, text=_('here')): 
    File "/home/ben/.virtualenvs/myproject/local/lib/python2.7/site-packages/django/utils/translation/__init__.py", line 83, in ugettext 
    return _trans.ugettext(message) 
    File "/home/ben/.virtualenvs/myproject/local/lib/python2.7/site-packages/django/utils/translation/trans_real.py", line 325, in ugettext 
    return do_translate(message, 'ugettext') 
    File "/home/ben/.virtualenvs/myproject/local/lib/python2.7/site-packages/django/utils/translation/trans_real.py", line 306, in do_translate 
    _default = translation(settings.LANGUAGE_CODE) 
    File "/home/ben/.virtualenvs/myproject/local/lib/python2.7/site-packages/django/utils/translation/trans_real.py", line 209, in translation 
    default_translation = _fetch(settings.LANGUAGE_CODE) 
    File "/home/ben/.virtualenvs/myproject/local/lib/python2.7/site-packages/django/utils/translation/trans_real.py", line 189, in _fetch 
    "The translation infrastructure cannot be initialized before the " 
django.core.exceptions.AppRegistryNotReady: The translation infrastructure cannot be initialized before the apps registry is ready. Check that you don't make non-lazy gettext calls at import time. 

我沒有使用過的應用程序的註冊表之前，所以我假定在使用翻譯之前，需要在我的應用程序中完成一些設置。我不斷看到解決的辦法是把它添加到wsgi.py：

from django.core.wsgi import get_wsgi_application 
application = get_wsgi_application() 

不過我已經有這些線路在那裏。在文件myproject/core/util.py我改變了以下行：

from django.utils.translation import ugettext as _ 

到：

from django.utils.translation import ugettext_lazy as _ 

而這只是移動的問題，其使用的ugettext另一個文件。是否不再可以使用非懶惰ugettext？還是有一些設置我需要做，以避免它在進口時被評估？

Answer 1

使用make_url(url, text=ugettext('here'))的問題是，對於text默認參數計算當模塊被導入，而不是當該make_url函數運行。

您沒有顯示生成第二個錯誤的代碼，所以我不知道它出了什麼問題。

在函數內部使用ugettext（只要該函數在導入期間不運行）就可以了。例如：

def make_url(url, text=None): 
    if text is None: 
     text = ugettext('here') 

注意，你仍然可以在你的代碼做import uggettext as _，我只是用ugettext以上是明確的。