Make TranslationHelper#translate use the :rescue_format option in I18n 0.5.0

Don't catch exceptions here. Instead only declare that we want exceptions to be rescued as :html, but also let users configure reactions to exceptions in I18n.

Signed-off-by: José Valim <jose.valim@gmail.com>

actionpack/lib/action_view/helpers/translation_helper.rb

@@ -1,13 +1,33 @@
 require 'action_view/helpers/tag_helper'
+require 'i18n/exceptions'
+
+module I18n
+  class ExceptionHandler
+    include Module.new {
+      def call(exception, locale, key, options)
+        exception.is_a?(MissingTranslationData) ? super.html_safe : super
+      end
+    }
+  end
+end
 
 module ActionView
   # = Action View Translation Helpers
   module Helpers
     module TranslationHelper
       # Delegates to I18n#translate but also performs three additional functions.
-      # First, it'll catch MissingTranslationData exceptions and turn them into
-      # inline spans that contains the missing key, such that you can see in a
-      # view what is missing where.
+      #
+      # First, it'll pass the :rescue_format => :html option to I18n so that any caught
+      # MissingTranslationData exceptions will be turned into inline spans that
+      #
+      #   * have a "translation-missing" class set,
+      #   * contain the missing key as a title attribute and
+      #   * a titleized version of the last key segment as a text.
+      #
+      # E.g. the value returned for a missing translation key :"blog.post.title" will be
+      # <span class="translation_missing" title="translation missing: blog.post.title">Title</span>.
+      # This way your views will display rather reasonableful strings but it will still
+      # be easy to spot missing translations.
       #
       # Second, it'll scope the key by the current partial if the key starts
       # with a period. So if you call <tt>translate(".foo")</tt> from the
@@ -24,15 +44,13 @@ module ActionView
       # 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.
       def translate(key, options = {})
-        translation = I18n.translate(scope_key_by_partial(key), options.merge!(:raise => true))
+        options.merge!(:rescue_format => :html) unless options.key?(:rescue_format)
+        translation = I18n.translate(scope_key_by_partial(key), options)
         if html_safe_translation_key?(key) && translation.respond_to?(:html_safe)
           translation.html_safe
         else
           translation
         end
-      rescue I18n::MissingTranslationData => e
-        keys = I18n.normalize_keys(e.locale, e.key, e.options[:scope])
-        content_tag('span', keys.join(', '), :class => 'translation_missing')
       end
       alias :t :translate
 

actionpack/test/fixtures/test/scoped_translation.erb

@@ -1 +0,0 @@
-<%= t('.foo.bar').join %>

actionpack/test/fixtures/test/translation.erb

@@ -1 +0,0 @@
-<%= t('.helper') %>

actionpack/test/fixtures/translations/templates/array.erb

@@ -0,0 +1 @@
+<%= t('.foo.bar') %>

actionpack/test/fixtures/translations/templates/found.erb

@@ -0,0 +1 @@
+<%= t('.foo') %>

actionpack/test/fixtures/translations/templates/missing.erb

@@ -0,0 +1 @@
+<%= t('.missing') %>

actionpack/test/template/translation_helper_test.rb

@@ -4,60 +4,73 @@ class TranslationHelperTest < ActiveSupport::TestCase
   include ActionView::Helpers::TagHelper
   include ActionView::Helpers::TranslationHelper
 
-  attr_reader :request
+  attr_reader :request, :view
+
   def setup
+    I18n.backend.store_translations(:en,
+      :translations => {
+        :templates => {
+          :found => { :foo => 'Foo' },
+          :array => { :foo => { :bar => 'Foo Bar' } }
+        },
+        :foo => 'Foo',
+        :hello => '<a>Hello World</a>',
+        :html => '<a>Hello World</a>',
+        :hello_html => '<a>Hello World</a>',
+        :array_html => %w(foo bar),
+        :array => %w(foo bar)
+      }
+    )
+    @view = ::ActionView::Base.new(ActionController::Base.view_paths, {})
   end
 
-  def test_delegates_to_i18n_setting_the_raise_option
-    I18n.expects(:translate).with(:foo, :locale => 'en', :raise => true).returns("")
+  def test_delegates_to_i18n_setting_the_rescue_format_option_to_html
+    I18n.expects(:translate).with(:foo, :locale => 'en', :rescue_format => :html).returns("")
     translate :foo, :locale => 'en'
   end
 
-  def test_returns_missing_translation_message_wrapped_into_span
-    expected = '<span class="translation_missing">en, foo</span>'
-    assert_equal expected, translate(:foo)
-  end
-
-  def test_translation_returning_an_array
-    I18n.expects(:translate).with(:foo, :raise => true).returns(["foo", "bar"])
-    assert_equal ["foo", "bar"], translate(:foo)
-  end
-
   def test_delegates_localize_to_i18n
     @time = Time.utc(2008, 7, 8, 12, 18, 38)
     I18n.expects(:localize).with(@time)
     localize @time
   end
 
-  def test_scoping_by_partial
-    I18n.expects(:translate).with("test.translation.helper", :raise => true).returns("helper")
-    @view = ::ActionView::Base.new(ActionController::Base.view_paths, {})
-    assert_equal "helper", @view.render(:file => "test/translation")
+  def test_returns_missing_translation_message_wrapped_into_span
+    expected = '<span class="translation_missing" title="translation missing: en.translations.missing">Missing</span>'
+    assert_equal expected, translate(:"translations.missing")
   end
 
-  def test_scoping_by_partial_of_an_array
-    I18n.expects(:translate).with("test.scoped_translation.foo.bar", :raise => true).returns(["foo", "bar"])
-    @view = ::ActionView::Base.new(ActionController::Base.view_paths, {})
-    assert_equal "foobar", @view.render(:file => "test/scoped_translation")
+  def test_translation_returning_an_array
+    expected = %w(foo bar)
+    assert_equal expected, translate(:"translations.array")
+  end
+
+  def test_finds_translation_scoped_by_partial
+    assert_equal 'Foo', view.render(:file => 'translations/templates/found').strip
+  end
+
+  def test_finds_array_of_translations_scoped_by_partial
+    assert_equal 'Foo Bar', @view.render(:file => 'translations/templates/array').strip
+  end
+
+  def test_missing_translation_scoped_by_partial
+    expected = '<span class="translation_missing" title="translation missing: en.translations.templates.missing.missing">Missing</span>'
+    assert_equal expected, view.render(:file => 'translations/templates/missing').strip
   end
 
   def test_translate_does_not_mark_plain_text_as_safe_html
-    I18n.expects(:translate).with("hello", :raise => true).returns("Hello World")
-    assert_equal false, translate("hello").html_safe?
+    assert_equal false, translate(:'translations.hello').html_safe?
   end
 
   def test_translate_marks_translations_named_html_as_safe_html
-    I18n.expects(:translate).with("html", :raise => true).returns("<a>Hello World</a>")
-    assert translate("html").html_safe?
+    assert translate(:'translations.html').html_safe?
   end
 
   def test_translate_marks_translations_with_a_html_suffix_as_safe_html
-    I18n.expects(:translate).with("hello_html", :raise => true).returns("<a>Hello World</a>")
-    assert translate("hello_html").html_safe?
+    assert translate(:'translations.hello_html').html_safe?
   end
 
   def test_translation_returning_an_array_ignores_html_suffix
-    I18n.expects(:translate).with(:foo_html, :raise => true).returns(["foo", "bar"])
-    assert_equal ["foo", "bar"], translate(:foo_html)
+    assert_equal ["foo", "bar"], translate(:'translations.array_html')
   end
 end