2 files changed, 17 insertions, 13 deletions
diff --git a/activesupport/lib/active_support/core_ext/array/conversions.rb b/activesupport/lib/active_support/core_ext/array/conversions.rb
index 7fcef38372..814567a5a6 100644
--- a/activesupport/lib/active_support/core_ext/array/conversions.rb
+++ b/activesupport/lib/active_support/core_ext/array/conversions.rb
@@ -13,19 +13,6 @@ class Array
     default_two_words_connector = I18n.translate(:'support.array.two_words_connector', :locale => options[:locale])
     default_last_word_connector = I18n.translate(:'support.array.last_word_connector', :locale => options[:locale])
 
-    # Try to emulate to_sentences previous to 2.3
-    if options.has_key?(:connector) || options.has_key?(:skip_last_comma)
-      ::ActiveSupport::Deprecation.warn(":connector has been deprecated. Use :words_connector instead", caller) if options.has_key? :connector
-      ::ActiveSupport::Deprecation.warn(":skip_last_comma has been deprecated. Use :last_word_connector instead", caller) if options.has_key? :skip_last_comma
-
-      skip_last_comma = options.delete :skip_last_comma
-      if connector = options.delete(:connector)
-        options[:last_word_connector] ||= skip_last_comma ? connector : ", #{connector}"
-      else
-        options[:last_word_connector] ||= skip_last_comma ? default_two_words_connector : default_last_word_connector
-      end
-    end
-
     options.assert_valid_keys(:words_connector, :two_words_connector, :last_word_connector, :locale)
     options.reverse_merge! :words_connector => default_words_connector, :two_words_connector => default_two_words_connector, :last_word_connector => default_last_word_connector
 
diff --git a/activesupport/lib/active_support/core_ext/array/uniq_by.rb b/activesupport/lib/active_support/core_ext/array/uniq_by.rb
new file mode 100644
index 0000000000..a09b2302fd
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/array/uniq_by.rb
@@ -0,0 +1,17 @@
+class Array
+  # Return an unique array based on the criteria given as a proc.
+  #
+  #   [1, 2, 3, 4].uniq_by { |i| i.odd? }
+  #   #=> [1, 2]
+  #
+  def uniq_by
+    hash, array = {}, []
+    each { |i| hash[yield(i)] ||= (array << i) }
+    array
+  end
+
+  # Same as uniq_by, but modifies self.
+  def uniq_by!
+    replace(uniq_by{ |i| yield(i) })
+  end
+end