Merge commit 'josevalim/validations'

1 files changed, 22 insertions, 4 deletions

diff --git a/activemodel/lib/active_model/naming.rb b/activemodel/lib/active_model/naming.rb
index 675d62b9a6..4cd68a0c89 100644
--- a/activemodel/lib/active_model/naming.rb
+++ b/activemodel/lib/active_model/naming.rb
@@ -2,11 +2,11 @@ require 'active_support/inflector'
 
 module ActiveModel
   class Name < String
-    attr_reader :singular, :plural, :element, :collection, :partial_path, :human
+    attr_reader :singular, :plural, :element, :collection, :partial_path
     alias_method :cache_key, :collection
 
-    def initialize(klass, name)
-      super(name)
+    def initialize(klass)
+      super(klass.name)
       @klass = klass
       @singular = ActiveSupport::Inflector.underscore(self).tr('/', '_').freeze
       @plural = ActiveSupport::Inflector.pluralize(@singular).freeze
@@ -15,13 +15,31 @@ module ActiveModel
       @collection = ActiveSupport::Inflector.tableize(self).freeze
       @partial_path = "#{@collection}/#{@element}".freeze
     end
+
+    # Transform the model name into a more humane format, using I18n. By default,
+    # it will underscore then humanize the class name (BlogPost.model_name.human #=> "Blog post").
+    # Specify +options+ with additional translating options.
+    def human(options={})
+      return @human unless @klass.respond_to?(:lookup_ancestors) &&
+                           @klass.respond_to?(:i18n_scope)
+
+      defaults = @klass.lookup_ancestors.map do |klass|
+        klass.model_name.underscore.to_sym
+      end
+
+      defaults << options.delete(:default) if options[:default]
+      defaults << @human
+
+      options.reverse_merge! :scope => [@klass.i18n_scope, :models], :count => 1, :default => defaults
+      I18n.translate(defaults.shift, options)
+    end
   end
 
   module Naming
     # Returns an ActiveModel::Name object for module. It can be
     # used to retrieve all kinds of naming-related information.
     def model_name
-      @_model_name ||= ActiveModel::Name.new(self, name)
+      @_model_name ||= ActiveModel::Name.new(self)
     end
   end
 end