python gettext同时使用不同的语言

时间:2013-06-29 12:28:42

标签: python internationalization flask gettext babel

我正在使用烧瓶,pybabel用于i18n。有时我需要向用户发送电子邮件。我想用他们自己的语言发送电子邮件。语言代码存储在数据库中,因此问题是使用正确的语言翻译模板。这是我的发送功能的一部分:

            lang = user.get_lang()
            subject = _('Subject')
            for user in users:
                if user.email:
                        body = render_template('emails/template.eml', user=user)
                        recipients = [user.email]
                        msg = Message(subject, html=body, recipients=recipients)
                        conn.send(msg)

模板的例子:

{{ _('Hi {name}. How are you?').format(user.name) }}

我需要的只是set_langauge(lang),我可以在每个模板渲染之前调用它。我该怎么办?

感谢。

2 个答案:

答案 0 :(得分:4)

我有电子邮件的下一个render_template功能:

def render_template(template_name_or_list, **context):

    # get  request context
    ctx = _request_ctx_stack.top

    # check request context
    # if function called without request context
    # then call with `test_tequest_context`
    # this because I send email from celery tasks
    if ctx is None:
        with current_app.test_request_context():
            return render_template(template_name_or_list, **context)

    # I have specific locale detection (from url)
    # and also use `lang` variable in template for `url_for` links
    # so you can just pass language parameter without context parameter
    # and always set `babel_locate` with passed language
    locale = getattr(ctx, 'babel_locale', None)
    if locale is None:
        ctx.babel_locale = Locale.parse(context['lang'])

    # render template without additinals context processor
    # because I don't need this context for emails
    # (compare with default flask `render_template` function)
    return _render(ctx.app.jinja_env.get_or_select_template(
        template_name_or_list), context, ctx.app)

因此,如果您只需要在请求上下文中更改语言,请使用下一个代码(请参阅get_locale):

def set_langauge(lang)
    ctx = _request_ctx_stack.top
    ctx.babel_locale = Locale.parse(lang)

答案 1 :(得分:4)

感谢@tbicr,我最终得到了这个解决方案。

在我的app.py中,我有set_locale函数:

from flask import _request_ctx_stack as ctx_stack
# ...
def set_locale(lang):
    ctx = ctx_stack.top
    ctx.babel_locale = lang
# ...

我在渲染电子邮件模板之前调用它。

问题是我需要同时向不同语言的许多用户发送电子邮件:

with app.test_request_context():
    with mail.connect() as conn:
        for user in users:
            set_locale(user.get_lang())
            subject = _(u'Best works').format(get_month_display(month))
            body = render_template('emails/best_works.eml'
                recipients = [user.email]
                msg = Message(subject, html=body, recipients=recipients)
                conn.send(msg)

当我第一次调用set_locale时,缓存了语言环境的值,并且使用第一个用户的语言呈现了所有电子邮件。

解决方案是每次flaskext.babel.refresh

后致电set_locale