=form.semantic_fields_for :menu_content do |content| 
  = content.inputs do 
    -if form.object.id != nil
  
      = content.input :title, :as => :string, :label => "Titre :"
      = content.input :keywords, :as => :string, :label => "Mots clefs :"
      = content.input :description, :as => :string, :label => "Description :"
    -else
      = content.hidden_field :title