python同时获取不同语言的文本

Question

我正在为 i18n 使用 flask、pybabel。有时我需要向我的用户发送电子邮件。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)

模板示例:

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

我只需要像 set_langauge(lang) 这样的东西，我可以在每个模板渲染之前调用它。我该怎么做？

谢谢。

Answer 1

我有下一个用于电子邮件的 render_template 函数:

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)