Displaying simple_form error messages in top <div> - ruby-on-rails-3

Question

I have the following two _forms:
user form
<%= simple_form_for(#user, :url => #target) do |f| %>
<% if #user.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(#user.errors.count, "error") %> prohibited this user from being saved:</h2>
<ul>
<% #user.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<%= f.input :email, :label => "User Email" %>
<%= f.input :password, :label => "User Password" %>
<%= f.input :first_name %>
<%= f.input :last_name %>
<%= f.button :submit %>
<% end %>
tenant form
<%= simple_form_for(#tenant, :url => #target) do |f| %>
<% if #tenant.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(#tenant.errors.count, "error") %> prohibited this tenant from being saved:</h2>
<ul>
<% #tenant.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<%= f.input :name, :label => 'Name', :required => true %>
<%= f.input :billing_email, :label => 'Email', :required => true %>
<%= f.input :country, :label => 'Country', :required => true %>
<%= f.button :submit %>
<% end %>
I have come across the following post from stackoverflow f.error_messages in Rails 3.0
Here there is method so that error messages can be returned from the simple form by using f.error_messages but I have been unable to get this working as I am unsure whereabout this method should be saved. Anyone got any hints? The method is as follows:
class StandardBuilder < ActionView::Helpers::FormBuilder
def error_messages
return unless object.respond_to?(:errors) && object.errors.any?
errors_list = ""
errors_list << #template.content_tag(:span, "There are errors!", :class => "title-error")
errors_list << object.errors.full_messages.map { |message| #template.content_tag(:li, message) }.join("\n")
#template.content_tag(:ul, errors_list.html_safe, :class => "error-recap round-border")
end
end

Answer 1

Just add error: false to your inputs this will not clear the css but will clear the inline errors
f.input error: false
Edit:
From http://ruby.railstutorial.org/book/ruby-on-rails-tutorial
/app/views/shared/_error_messages.html.erb
<% if object.errors.any? %>
<div id="error_explanation">
<div class="alert alert-error">
The form contains <%= pluralize(object.errors.count, "error") %>.
</div>
<ul>
<% object.errors.full_messages.each do |msg| %>
<li>* <%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
in VIEW
<%= form_for(#user) do |f| %>
<%= render 'shared/error_messages', object: f.object %>
<%= f.label :name %>
<%= f.text_field :name %>
<%= f.label :email %>
<%= f.text_field :email %>
<%= f.label :password %>
<%= f.password_field :password %>
<%= f.label :password_confirmation, "Confirmation" %>
<%= f.password_field :password_confirmation %>
<%= f.submit "Create my account", class: "btn btn-large btn-primary" %>
<% end %>