render_to_string（）抱怨非类型

Question

所以我在python manage.py shell中测试我的代码，但是我得到了以下错误：AttributeError: 'NoneType' object has no attribute 'find'。在

以下是我在应用程序的models.py中所做的：

from djmoney.models.fields import MoneyField
from django.template.loader import render_to_string
from django.db import models
from datetime import date
import mandrill

<；…>

^{pr2}$

回溯似乎表明问题出在render_to_string()，但我看不出我在实现上做了什么错误：我测试了shell中是否存在该模板（它是一个电子邮件模板）。事实上，没有上下文的render_to_string('email/invoice.html')可以很好地工作。问题在于上下文。在

我试着在shell中使用一个简单的dict，比如context = {'hst': 123}，这也很管用。因为某些原因，它不喜欢我上面的格言，并抱怨一个不典型的人。我单独检查了shell并确保它在每个字段中都存在一个值。在

你知道这个怪物是从哪里来的吗？在

编辑：这是完整的回溯

Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/Users/cyehia/Documents/Apps/gcap/rental/models.py", line 41, in email_invoice
    msg_html = render_to_string('email/invoice.html', context)
  File "/Users/cyehia/Documents/Apps/venv/lib/python3.4/site-packages/django/template/loader.py", line 99, in render_to_string
    return template.render(context, request)
  File "/Users/cyehia/Documents/Apps/venv/lib/python3.4/site-packages/django/template/backends/django.py", line 74, in render
    return self.template.render(context)
  File "/Users/cyehia/Documents/Apps/venv/lib/python3.4/site-packages/django/template/base.py", line 209, in render
    return self._render(context)
  File "/Users/cyehia/Documents/Apps/venv/lib/python3.4/site-packages/django/template/base.py", line 201, in _render
    return self.nodelist.render(context)
  File "/Users/cyehia/Documents/Apps/venv/lib/python3.4/site-packages/django/template/base.py", line 903, in render
    bit = self.render_node(node, context)
  File "/Users/cyehia/Documents/Apps/venv/lib/python3.4/site-packages/django/template/debug.py", line 79, in render_node
    return node.render(context)
  File "/Users/cyehia/Documents/Apps/venv/lib/python3.4/site-packages/django/template/debug.py", line 92, in render
    output = force_text(output)
  File "/Users/cyehia/Documents/Apps/venv/lib/python3.4/site-packages/django/utils/encoding.py", line 90, in force_text
    s = six.text_type(s)
  File "/Users/cyehia/Documents/Apps/venv/lib/python3.4/site-packages/djmoney/models/fields.py", line 133, in __str__
    locale = self.__get_current_locale()
  File "/Users/cyehia/Documents/Apps/venv/lib/python3.4/site-packages/djmoney/models/fields.py", line 103, in __get_current_locale
    locale = translation.to_locale(translation.get_language())
  File "/Users/cyehia/Documents/Apps/venv/lib/python3.4/site-packages/django/utils/translation/__init__.py", line 185, in to_locale
    return _trans.to_locale(language)
  File "/Users/cyehia/Documents/Apps/venv/lib/python3.4/site-packages/django/utils/translation/trans_real.py", line 75, in to_locale
    p = language.find('-')
AttributeError: 'NoneType' object has no attribute 'find'

Answer 1

问题似乎与incompatibly between Django 1.8 and django-money有关。我会尝试手动激活一种语言：

from django.utils.translation import activate 

def email_invoice(self):
    <....>
    activate('en')
    msg_html = render_to_string('email/invoice.html', context)