=f.input :amount, :label => "Montant"
=f.text_field :transaction_content_type
=#f.text_field :transaction_content_id
- transaction_content_type = f.object.transaction_content_type
=f.semantic_fields_for :transaction_content do |f| 
  -if transaction_content_type == "TransactionDonate"
    =f.input :donate_destination, :collection => DonateDestination.all
  -else transaction_content_type == "TransactionSponsorship"
    =f.input :sponsorship_animal, :collection => SponsorshipAnimal.all