如何在Rails上实现两种简单形式

如何解决如何在Rails上实现两种简单形式

我正在编码需要打开动物诊所案例的页面。由于UX的原因，我负责创建创建新动物的模式。想到这个，我试图写：

<%= simple_form_for(@vet_case) do |f| %>
  <%= f.error_notification %>
  <%= f.error_notification message: f.object.errors[:base].to_sentence if f.object.errors[:base].present? %>

  ...

<% end %>

<%= simple_form_for(@pet) do |f| %>
  <%= f.error_notification %>
  <%= f.error_notification message: f.object.errors[:base].to_sentence if f.object.errors[:base].present? %>

  <!-- Modal -->
  <div class="modal fade" id="createAnimal" tabindex="-1" role="dialog" aria-labelledby="createAnimal" aria-hidden="true">
    <div class="modal-dialog modal-lg modal-dialog-centered" role="document">
      <div class="modal-content">
        <div class="modal-header">
          <h5 class="modal-title" id="exampleModalLongTitle">Cadastrar Novo Animal</h5>

          <button type="button" class="close" data-dismiss="modal" aria-label="Close">
            <span aria-hidden="true">&times;</span>
          </button>
        </div>

        <div class="modal-body">
          ...
        </div>

        <div class="modal-footer">
          <button type="button" class="btn btn-secondary" data-dismiss="modal">Descatar</button>
          <button type="button" class="btn btn-primary">Cadastrar Animal</button>
        </div>
      </div>
    </div>
  </div>
<% end %>

但是，rails适用于： nil：NilClass的未定义方法“ model_name”