不确定我的 form_for 有什么问题

Question

在一组餐食的布局中，我有以下代码：

  <tr class="food food-tr-<%= meal_food.id %>">
    <td><%= meal_food.name  %></td>
    <td>
      <% form_for :meal_food, meal_food, url: { controller: "foods", action: "update" }, html: { class: "meal_food_servings-#{meal_food.id}" } do |f| %>
        <%= f.number_field :servings %>
      <% end %>

    </td>
    <td><%= pluralize(meal_food.serving_size, meal_food.measure_type) %></td>
    <td><%= meal_food.fat    %></td>
    <td><%= meal_food.carbs  %></td>
    <td><%= meal_food.protien %> </td>
    <td><%= link_to "x", food_path(meal_food.id), method: :delete, remote: true %> </td>
  </tr>

在第二个 td 单元格中，我试图呈现一个提交给食品更新操作的小表单。

我一直遇到的错误是在尝试在这些表单所在的位置呈现膳食显示页面时出现的错误。

wrong number of arguments (3 for 2)

我正在按照此处 http://guides.rubyonrails.org/v2.3.11/form_helpers.html#binding-a-form-to-an-object 的 rails 指南中的示例进行操作

当我放

<%= meal_food %> 

它输出一个meal_food 对象引用。所以我不确定这是否是问题所在。

谢谢！

--------- Routes.rb

      mount RailsAdmin::Engine => '/admin', :as => 'rails_admin'

      resources :status_updates do 
        collection do 
          delete :delete_all
        end
      end

      resources :meals  
      resources :foods do
        collection do
          get :search
        end
      end


      devise_for :users, :controllers => { :registrations => "registrations" }

      root to: 'static_pages#home'
      match '/faq', to: 'static_pages#faq'
      match '/contact', to: 'static_pages#contact'

Answer 1

试试这个：

<%= form_for meal_food, url: food_url(meal_food.id) html: { class: "meal_food_servings-#{meal_food.id}" } do |f| %>