Adds a helper for displaying validation error messages.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@9017 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/helpers/application_helper.rb

@@ -945,6 +945,20 @@ module ApplicationHelper
     remote_form_for(*args, &proc)
   end
 
+  def error_messages_for(*objects)
+    html = ""
+    objects = objects.map {|o| o.is_a?(String) ? instance_variable_get("@#{o}") : o}.compact
+    errors = objects.map {|o| o.errors.full_messages}.flatten
+    if errors.any?
+      html << "<div id='errorExplanation'><ul>\n"
+      errors.each do |error|
+        html << "<li>#{h error}</li>\n"
+      end
+      html << "</ul></div>\n"
+    end
+    html.html_safe
+  end  
+
   def back_url_hidden_field_tag
     back_url = params[:back_url] || request.env['HTTP_REFERER']
     back_url = CGI.unescape(back_url.to_s)