python - Pyramid 和 pyramid_simple 中的 Formencode 来自 : set fixed locale

Question

我知道我可以在 python shell 中运行以下代码:

import formencode
ne = formencode.validators.NotEmpty()
formencode.api.set_stdtranslation(languages=["it"])
try:
    ne.to_python("")
except formencode.api.Invalid, e:
    print str(e)

打印出来

Inserire un valore

现在如何使用 pyramid_simpleform 和 Formencode 在我的 Pyramid 应用程序中获得相同的结果？

Answer 1

我刚刚找到了一种方法，但我不确定它是否是最好的...无论如何，我混合了来自 Mako i18n recipe 的信息, simpleform documentation以及 Pylons 是如何做到的(pylons.decorators 中的 PylonsFormEncodeState)，我想出了以下...

我订阅了这样的 NewRequest 事件:

config.add_subscriber("myproject.subscribers.add_localizer",
                      "pyramid.events.NewRequest")

然后定义add_localizer:

from pyramid import i18n
from formencode import api as formencode_api

def add_localizer(event):
    request = event.request
    localizer = i18n.get_localizer(request)
    if not hasattr(localizer, "old_translate"):
        localizer.old_translate = localizer.translate # Backup the default method
    request.localizer = localizer
    request.translate = lambda x: localizer.translate(i18n.TranslationString(x))

    # Set FormEncode language for this request
    formencode_api.set_stdtranslation(languages=["it"]) # This should depend on the user's selection or whatever

    def multiple_gettext(value):
        # Try default translation first
        t = localizer.old_translate(i18n.TranslationString(value))
        if t == value:
            # It looks like translation failed, let's try FormEncode
            t = formencode_api._stdtrans(value)
        return t

    localizer.translate = multiple_gettext