嵌套字段- RoR - link_to_add_associations

Question

我在一个带有3个表的表单中使用了cocoon和嵌套字段，如此db方案所示:)

我想添加一个新菜单，因此在a menus/new.html.erb中我有：

    <%= simple_form_for @menu do |f| %>
  <%= f.input :name, label: "name", label_method: :name, value_method: :id, include_blank: true %>

  <h3>Portions</h3>
  <div id='portions'>
    <%= f.simple_fields_for :portions do |portion| %>
      <%= render 'portion_fields', :f => portion %>
    <% end %>
    <div class='links'>
      <%= link_to_add_association 'add portion', f, :portions %>
    </div>
  </div>
  <%= f.submit 'valider' %>
<% end %>

在我的partial中，嵌套字段为_portion_fields.html.erb：

<div class='nested-fields'>
    <%= f.association :aliment, label: "Intitulé de l'aliment", label_method: :label, value_method: :id, include_blank: true %>
    <%= f.input :portion_qty, label: "Qté", placeholder:"portions", as: :integer %>
    <%= link_to_remove_association "remove portion", f %>
</div>

和我的模型：

  class Menu < ApplicationRecord
  has_many :portions, dependent: :destroy
  has_many :aliments, through: :portions, dependent: :destroy

  accepts_nested_attributes_for :portions, reject_if: :all_blank, allow_destroy: true
end



 class Aliment < ApplicationRecord
  has_many :portions
  has_many :menus, through: :portions, dependent: :destroy
end

    class Portion < ApplicationRecord
  belongs_to :aliment, foreign_key: :aliment_id
  belongs_to :menu, foreign_key: :menu_id
end

这个错误告诉我：

​

​

Answer 1

link_to_remove_association助手(Cocoon::ViewHelpers)从cocoon railtie加载到应用程序启动，如果您在gem安装后没有重新启动应用程序服务器，则可能会发生此错误(也要执行spring stop以确保)。