如何仅对某些语言环境而不是对所有语言环境启用Rails i18n后备? [英] How do I enable Rails i18n fallbacks only for some locales, not all?

问题描述

我正在Rails 4应用程序中使用i18n后备，以减少"de"和"de-AT"语言环境的重复翻译(将来可能会添加更多这样的对).为了使之成为可能，我在 application.rb 中启用了后备广告:

I am using i18n fallbacks in a Rails 4 application in order to reduce duplicate translations for "de" and "de-AT" locales (possibly more pairs like this to add in the future). In order to make this possible, I've enabled fallbacks in my application.rb:

config.i18n.fallbacks = true
config.i18n.fallbacks = {'de-AT' => 'de'}

但是我不希望其他语言环境在生产和开发过程中都不使用英语(这是默认语言环境).

But I don't want other locales to fall back to English (which is the default locale), neither in production nor in development.

有可能吗?如果可以，我该如何实现呢?

Is that possible, and if yes, how do I achieve that?

推荐答案

在Rails 6.1或更高版本中这很棘手，因为您需要

This is tricky in Rails up to 6.1 because you need to beat the logic in the Railtie initializer which desperately wants to fallback to the default_locale.

要将默认的后备区域设置设置为 nil ，您需要使用以下代码:

To set the default fallback locale to nil you need to use the following code:

config.i18n.default_locale = :en
config.i18n.fallbacks.defaults = [[]] # If you just write [], then default_locale is used
config.i18n.fallbacks.map = {
  ca: :es, # Catalan fallback to Spanish
  de: "en-UK", # German fallback to UK English first, then automatically to :en
}

注#1:默认情况下，所有国家/地区变体( en-US )都会先回退到语言(例如 en )，并且您只需要指定一些内容即可后退的方式有所不同.

Note #1: By default all country variants (en-US) will fallback to languages first (e.g en) and you only need to specify something if you want to fallback differently.

注意#2:要检查设置是否正确，请执行以下操作:

Note #2: To check if you set it up correctly:

...> rails console
2.7.2 :001 > I18n.fallbacks["de-AT"] # Check what happens with Austrian German?
 => [:"de-AT", :de, :"en-UK", :en]

2.7.2 :002 > I18n.fallbacks[:ca]     # Catalan falls back to Spanish
 => [:es]

2.7.2 :003 > I18n.fallbacks[:fr]     # French should have no fallback!
 => [:fr]

注意#3:映射将递归扩展.

Note #3: Mappings will be recursively expanded.

config.i18n.fallbacks.map = {
  es: :fr, # Spanish to French
  fr: :en, # French to English
}

rails console
2.7.2 :001 > I18n.fallbacks[:es]
 => [:es, :fr, :en]

但是您不需要注意周期和/或重复项.这些被过滤掉了.

But you don't need to watch for cycles and/or duplicates. These are filtered out.

注#4:映射哈希还可以将语言代码映射到数组，该数组按从左到右的顺序进行处理.

Note #4: The mapping hash can map language codes also to arrays, which are processed in order from left to right.

config.i18n.fallbacks.map = {
  ca: [:es, :fr, :en], # Catalan falls back to Spanish then French, then English
}

注释5:我还没有找到一个好的规范语言映射模型，该模型需要适当"的语言映射.后备决策基于每个国家/地区当前的语言技能并将其编码为Rails.

Note #5: I haven't found a good canonical language mapping model, which takes "appropriate" fallback decisions based on language current language skills per country and encodes it in Rails.

注释#6:我强烈建议:

Note #6: I would strongly suggest:

• 将:en用作所有内容的唯一且主要的后备.
• 保持:en版本尽可能简单和惯用.
• 自定义"zh-CN"和"en-UK"在选定的地方.
• 如果您要翻译，请进行全面的翻译.部分翻译UI非常令人恼火.

注释#7:从Rails 6.1.3开始，默认语言环境不再默认作为回退(

Note #7: Starting in Rails 6.1.3 the default locale is no longer included by default as a fallback (see this commit)

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