- url = iro_purse.new_record? ? iro_purses_path : iro_purse_path(iro_purse)

.iro-purses--form
  = form_for iro_purse, as: :iro_purse, url: url do |f|
    .field
      -# = f.label :config
      = f.text_area :config
    .actions
      = f.submit 'Submit'