diff --git a/lib/action_view/helpers/dynamic_form.rb b/lib/action_view/helpers/dynamic_form.rb
index f127ff9..2cb178d 100644
--- a/lib/action_view/helpers/dynamic_form.rb
+++ b/lib/action_view/helpers/dynamic_form.rb
@@ -221,7 +221,7 @@ def error_messages_for(*params)
 
             message = options.include?(:message) ? options[:message] : locale.t(:body)
 
-            error_messages = objects.sum do |object|
+            error_messages = objects.map do |object|
               object.errors.full_messages.map do |msg|
                 content_tag(:li, msg)
               end
diff --git a/lib/active_model/dynamic_errors.rb b/lib/active_model/dynamic_errors.rb
index e5447d4..643ed20 100644
--- a/lib/active_model/dynamic_errors.rb
+++ b/lib/active_model/dynamic_errors.rb
@@ -13,27 +13,22 @@ class Errors
     def full_messages
       full_messages = []
 
-      each do |attribute, messages|
-        messages = Array.wrap(messages)
-        next if messages.empty?
-
-        if attribute == :base
-          messages.each {|m| full_messages << m }
+      each do |error|
+        if error.attribute == :base
+          full_messages << error.message
         else
-          attr_name = attribute.to_s.gsub('.', '_').humanize
-          attr_name = @base.class.human_attribute_name(attribute, :default => attr_name)
+          attr_name = error.attribute.to_s.gsub('.', '_').humanize
+          attr_name = @base.class.human_attribute_name(error.attribute, :default => attr_name)
           options = { :default => "%{attribute} %{message}", :attribute => attr_name }
 
-          messages.each do |m|
-            if m =~ /^\^/
-              options[:default] = "%{message}"
-              full_messages << I18n.t(:"errors.dynamic_format", options.merge(:message => m[1..-1]))
-            elsif m.is_a? Proc
-              options[:default] = "%{message}"
-              full_messages << I18n.t(:"errors.dynamic_format", options.merge(:message => m.call(@base)))
-            else
-              full_messages << I18n.t(:"errors.format", options.merge(:message => m))
-            end            
+          if error.message =~ /^\^/
+            options[:default] = "%{message}"
+            full_messages << I18n.t(:"errors.dynamic_format", **options.merge(:message => error.message[1..-1]))
+          elsif error.message.is_a? Proc
+            options[:default] = "%{message}"
+            full_messages << I18n.t(:"errors.dynamic_format", **options.merge(:message => error.message.call(@base)))
+          else
+            full_messages << I18n.t(:"errors.format", **options.merge(:message => error.message))
           end
         end
       end
@@ -44,4 +39,4 @@ def full_messages
 end
 
 require 'active_support/i18n'
-I18n.load_path << File.dirname(__FILE__) + '/locale/en.yml'
\ No newline at end of file
+I18n.load_path << File.dirname(__FILE__) + '/locale/en.yml'