Question

我正在开发一款计算口粮的应用。每种口粮都有很多种，每种口粮都属于口粮和饲料。我希望用户通过一次提交更新属于口粮的ration_items的数量，因此我在编辑口粮页面上创建了一个嵌套表格。

具有属于特定比率的ration_items的表格如下所示：

<%= form_for @ration do |f| %>
     <table class="table table-striped">
      <thead>
        <tr>
          <th>Quantity</th>
          <th>Name</th>
        </tr>
      </thead>
      <tbody>
          <% @ration.ration_items.each do |ration_item| %>
          <%= render 'ration_item_row', feedstuff: ration_item.feedstuff, ration_item: ration_item, f: f %>
          <% end %>
      </tbody>
     </table>
<%= f.submit %>
<% end %>

具有ration_item行的部分：

<%= f.fields_for ration_item do |r| %>
    <tr>
      <td><%= r.number_field :quantity, value: ration_item.quantity %></td>
      <td><%= feedstuff.name %></td>
      <td><%= link_to "", ration_item, method: :delete, class: "glyphicon glyphicon-trash", data: { toggle:'tooltip' }, title: 'Delete', data: { confirm: 'Are you sure?' } %></td>
    </tr>
<% end %>

我在口粮控制器中添加了强力参数：

def ration_params
  params.require(:ration).permit(:name, :user_id, ration_items_attributes: [:id, :quantity, :feedstuff_id])
end

现在，当我更改ration_item数量并提交时，它不会保存数量，而只会重定向到编辑页面。服务器输出如下：

Started PATCH "/rations/4" for 127.0.0.1 at 2015-08-18 16:11:05 +0200
Processing by RationsController#update as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"HeG3ffOcUJUY68ggiruE1pDReo8X5ftr4YBgBswGMJzQ+cOF3GlCcQHm3Kd349WTDkGzOwUtEEm2Ur9DpKGGPw==", "ration"=>{"ration_item"=>{"quantity"=>"500"}}, "commit"=>"Ration bewaren", "id"=>"4"}
  Ration Load (0.2ms)  SELECT  "rations".* FROM "rations" WHERE "rations"."id" = ? LIMIT 1  [["id", 4]]
Unpermitted parameter: ration_item
   (0.1ms)  begin transaction
   (0.1ms)  commit transaction
Redirected to http://localhost:3000/rations/4/edit
Completed 302 Found in 6ms (ActiveRecord: 0.3ms)

关于如何让我的工作得到高度赞赏的任何想法！

ration.rb：

class Ration < ActiveRecord::Base
  belongs_to :user
  has_many :ration_items, dependent: :destroy
  validates :name, presence: true
  validates :user_id, presence: true
  accepts_nested_attributes_for :ration_items
  
  def to_s
    name
  end
  
end

ration_item.rb：

class RationItem < ActiveRecord::Base
  belongs_to :feedstuff
  belongs_to :ration
  validates :feedstuff_id, presence: true
  validates :quantity, presence: true
end

feedstuff.rb：

class Feedstuff < ActiveRecord::Base
  validates :user_id, presence: true
  validates :name, presence: true, length: {maximum: 20}, uniqueness: true
  belongs_to :user
  has_many :ration_items
  
  def to_s
    name
  end

    
end

rails中的嵌套表单无法保存

0 个答案: