method

translate

v5.0.0.1 - Show latest stable - 1 note - Class: ActionView::Helpers::TranslationHelper

translate(key, options = {}) public

Delegates to I18n#translate but also performs three additional functions.

First, it will ensure that any thrown MissingTranslation messages will be rendered as inline spans that:

Have a translation-missing class applied
Contain the missing key as the value of the title attribute
Have a titleized version of the last key segment as text

For example, the value returned for the missing translation key "blog.post.title" will be:

<span
  class="translation_missing"
  title="translation missing: en.blog.post.title">Title</span>

This allows for views to display rather reasonable strings while still giving developers a way to find missing translations.

If you would prefer missing translations to raise an error, you can opt out of span-wrapping behavior globally by setting ActionView::Base.raise_on_missing_translations = true or individually by passing raise: true as an option to translate.

Second, if the key starts with a period translate will scope the key by the current partial. Calling translate(".foo") from the people/index.html.erb template is equivalent to calling translate("people.index.foo"). This makes it less repetitive to translate many keys within the same partial and provides a convention to scope keys consistently.

Third, the translation will be marked as html_safe if the key has the suffix “_html” or the last element of the key is “html”. Calling translate("footer_html") or translate("footer.html") will return an HTML safe string that won’t be escaped by other HTML helper methods. This naming convention helps to identify translations that include HTML tags so that you know what kind of output to expect when you call translate in a template and translators know which keys they can provide HTML values for.

Show source

# File actionview/lib/action_view/helpers/translation_helper.rb, line 59
      def translate(key, options = {})
        options = options.dup
        has_default = options.has_key?(:default)
        remaining_defaults = Array(options.delete(:default)).compact

        if has_default && !remaining_defaults.first.kind_of?(Symbol)
          options[:default] = remaining_defaults
        end

        # If the user has explicitly decided to NOT raise errors, pass that option to I18n.
        # Otherwise, tell I18n to raise an exception, which we rescue further in this method.
        # Note: `raise_error` refers to us re-raising the error in this method. I18n is forced to raise by default.
        if options[:raise] == false
          raise_error = false
          i18n_raise = false
        else
          raise_error = options[:raise] || ActionView::Base.raise_on_missing_translations
          i18n_raise = true
        end

        if html_safe_translation_key?(key)
          html_safe_options = options.dup
          options.except(*I18n::RESERVED_KEYS).each do |name, value|
            unless name == :count && value.is_a?(Numeric)
              html_safe_options[name] = ERB::Util.html_escape(value.to_s)
            end
          end
          translation = I18n.translate(scope_key_by_partial(key), html_safe_options.merge(raise: i18n_raise))

          translation.respond_to?(:html_safe) ? translation.html_safe : translation
        else
          I18n.translate(scope_key_by_partial(key), options.merge(raise: i18n_raise))
        end
      rescue I18n::MissingTranslationData => e
        if remaining_defaults.present?
          translate remaining_defaults.shift, options.merge(default: remaining_defaults)
        else
          raise e if raise_error

          keys = I18n.normalize_keys(e.locale, e.key, e.options[:scope])
          title = "translation missing: #{keys.join('.')}"

          interpolations = options.except(:default, :scope)
          if interpolations.any?
            title << ", " << interpolations.map { |k, v| "#{k}: #{ERB::Util.html_escape(v)}" }.join(', ')
          end

          return title unless ActionView::Base.debug_missing_translation

          content_tag('span', keys.last.to_s.titleize, class: 'translation_missing', title: title)
        end
      end

January 11, 2010 - (>= v2.2.1)

2 thanks

Default fallback

You can specifly :default option which is useful when the translation is not found. For example:

t(:this_translation_doesnt_exist, :default => 'Ooops!')
# => Ooops!

Or even any number of “fallbacks” - the first not nil is returned:

t(:missing, :default => [:missing_too, :existing, 'Sad panda'])
# => :existing translation

Good introduction to Rails I18n is http://guides.rubyonrails.org/i18n.html

translate

Related methods

Default fallback