<%= grid(@grid) do |g| g.column(:attribute_name => 'name') g.column(:attribute_name => 'firstname', :model_class => 'Person') g.column(:attribute_name => 'lastname', :model_class => 'Person') g.column(:attribute_name => 'updated_at') do |project| project.updated_at.strftime("%d/%m/%Y %H:%M") end end -%>