Easy Exceptions handling in ROR

Use this in your application.rb file :
rescue_from NameError, :with => :handle_exceptions
rescue_from NoMethodError, :with => :handle_exceptions
rescue_from ActiveRecord::Rollback, :with => :handle_exceptions
rescue_from ActiveRecord::StatementInvalid, :with => :handle_exceptions
rescue_from ActiveRecord::RecordNotFound, :with => :handle_exceptions
rescue_from ActionController::UnknownAction, :with => :handle_exceptions
rescue_from ActiveRecord::RecordNotFound, :with => :handle_exceptions
rescue_from ActiveRecord::StaleObjectError, :with => :handle_exceptions
rescue_from ActiveRecord::RecordInvalid, :with => :handle_exceptions
rescue_from ActiveRecord::RecordNotSaved, :with => :handle_exceptions
rescue_from ActionController::MethodNotAllowed, :with => :handle_exceptions
rescue_from ActionController::MethodNotAllowed, :with => :handle_exceptions
rescue_from ActionController::InvalidAuthenticityToken, :with => :handle_exceptions

private

def handle_exceptions
render :action => '500.html',:text => 'This is an error', :status => 500
end

Display keys and values of hashes

Well before reading this Post let me tell you that author of this Idea is My friend "Michael Graff"

<% @hash.each do |key, value| %>
<%=h "#{key.to_s} #{value.to_s}" %>
<% end %>

You can iterate through hashes in many various ways, including sorting them:

<% @hash.keys.sort.each do |key| %>
<%=h "#{key.to_s} #{@hash[key]}" %>
<% end %>