Added Base.human_name method

activerecord/lib/active_record/base.rb

@@ -1249,6 +1249,19 @@ module ActiveRecord #:nodoc:
         options[:count] ||= 1
         I18n.translate(defaults.shift, options.merge(:default => defaults, :scope => [:activerecord, :attributes]))
       end
+
+      # Transform the modelname into a more humane format, using I18n.
+      # Defaults to the basic humanize method.
+      # Default scope of the translation is activerecord.models
+      # Specify +options+ with additional translating options.
+      def human_name(options = {})
+        defaults = self_and_descendents_from_active_record.map do |klass|
+          :"#{klass.name.underscore}"
+        end 
+        defaults << self.name.humanize
+        I18n.translate(defaults.shift, {:scope => [:activerecord, :models], :count => 1, :default => defaults}.merge(options))
+      end
+
       # True if this isn't a concrete subclass needing a STI type condition.
       def descends_from_active_record?
         if superclass.abstract_class?

activerecord/test/cases/i18n_test.rb

@@ -0,0 +1,46 @@
+require "cases/helper"
+require 'models/topic'
+require 'models/reply'
+
+class ActiveRecordI18nTests < Test::Unit::TestCase
+
+  def setup
+    reset_translations
+  end
+  
+  def test_translated_model_attributes
+    I18n.store_translations 'en-US', :activerecord => {:attributes => {:topic => {:title => 'topic title attribute'} } }
+    assert_equal 'topic title attribute', Topic.human_attribute_name('title')
+  end
+
+  def test_translated_model_attributes_with_sti
+    I18n.store_translations 'en-US', :activerecord => {:attributes => {:reply => {:title => 'reply title attribute'} } }
+    assert_equal 'reply title attribute', Reply.human_attribute_name('title')
+  end
+
+  def test_translated_model_attributes_with_sti_fallback
+    I18n.store_translations 'en-US', :activerecord => {:attributes => {:topic => {:title => 'topic title attribute'} } }
+    assert_equal 'topic title attribute', Reply.human_attribute_name('title')
+  end
+
+  def test_translated_model_names
+    I18n.store_translations 'en-US', :activerecord => {:models => {:topic => 'topic model'} }
+    assert_equal 'topic model', Topic.human_name
+  end
+
+  def test_translated_model_names_with_sti
+    I18n.store_translations 'en-US', :activerecord => {:models => {:reply => 'reply model'} }
+    assert_equal 'reply model', Reply.human_name
+  end
+
+  def test_translated_model_names_with_sti_fallback
+    I18n.store_translations 'en-US', :activerecord => {:models => {:topic => 'topic model'} }
+    assert_equal 'topic model', Reply.human_name
+  end
+
+  private
+  def reset_translations
+    I18n.backend.send(:class_variable_set, :@@translations, {})
+  end
+end
+