Rails / I18n: default scope

问题:

I'm using the default I18n module for Rails to translate my strings in views.

<%= t("registration.heading") %>

Now, when I'm in the registration-view, all my strings start with registration. I always have to write

<%= t("registration.heading.notice") %>
// or
<%= t(:heading, :scope => :registration) %>

It would be nice to define a default scope for that file (maybe even in the controller), so a call to t automatically adds the defined scope

// controller
set_i18n_default_scope :registration

// view
<%= t(:heading) %>

// --> looks in "registration.heading"

Is this possible?

回答1:

If you organize your translations adding a view name, as in:

en:
  registration:
    index:
      heading: "Registration heading"

then you may use this:

<%= t(".heading") %>

Notice that the first character is a dot.

You may read about it in Rails Internationalization (I18n) API Guide

If you have texts which are shared amongst numerous views, and you don't want to copy the same translation in each section for each view, you may use YAML references. They are nicely described on wikipedia: http://en.wikipedia.org/wiki/YAML#Repeated_nodes

回答2:

It is possible. Check section 4.1.4 of the Rails i18n API

4.1.4 “Lazy” Lookup

Rails 2.3 implements a convenient way to look up the locale inside views. When you have the following dictionary:

  es:   books:
          index:
             title: "Título" 

you can look up the books.index.title value inside

app/views/books/index.html.erb template like this (note the dot):

<%= t '.title' %>

回答3:

Regarding Lazy Lookups:

Here's the general solution for this kind of problem

Common Problem: Where is Rails trying to look-up L10N / I18N Strings? - e.g. when doing Lazy Lookups

It's not easy to guess, because it's different for Views, Controllers, Models, Labels, Helpers, or Validations... etc... but...

It's easy to find out directly, using this:

http://www.unixgods.org/Rails/where_is_Rails_trying_to_lookup_L10N_strings.html

this helps figuring out what Rails thinks the current scope is (e.g. when using ".heading")

3 Simple Steps:

1. create a file ./config/initializers/i18n.rb , as described in the article above
2. put t('.heading') in your view
3. start "rails server" and look in the console output where Rails thinks the default location is for '.heading' for this view... e.g. what's the I18N-key

(4. then add the I18N string into the location identified by the key)

Works like a charm :-)

回答4:

If you want to print out keys that I18n gem's lazy mode is looking for, you can add that in a i18n.rb file in your initializers folder:

module I18n
  module Backend
    class Simple
      module Implementation
        alias_method :lookup_orig, :lookup

        # Give ability to check I18n looked up keys in lazy mode by setting env var I18N_DEBUG to true
        # 
        def lookup(locale, key, scope = [], options = {})
          puts "I18N keys: #{I18n.normalize_keys(locale, key, scope, options[:separator])}" if ENV['I18N_DEBUG']
          lookup_orig(locale, key, scope, options)
        end
      end
    end
  end
end

(Gist: https://gist.github.com/capripot/6e6cf778ad2db0443280)

And then start your server like for instance:

I18N_DEBUG=true bundle exec rails server