Question

我有表单，当我提交此表单时，rails会使用params重定向到new_admin_item_path，但我需要添加到app_f.input :gost, as: :select所选的选项，我该怎么办？

这是我的表格。

form(:html => { :multipart => true }) do |f|
    f.inputs "Item" do
      f.input :name, label: 'Имя', :input_html => { :value => params[:name] } 
      f.input :category_id, as: :select, collection: SubCategory.all, :selected => params[:category_id]
      f.input :size
      f.input :wall_th, label: "Толщина стенки"
      f.input :price, :input_html => { :value => params[:price] } 
    end
    f.inputs do
    f.has_many :item_gosts, allow_destroy: true, new_record: true do |app_f|
      if !app_f.object.nil?
        # show the destroy checkbox only if it is an existing appointment
        # else, there's already dynamic JS to add / remove new appointments
        app_f.input :_destroy, :as => :boolean, :label => "Destroy?"
      end
      app_f.input :gost, as: :select, collection: if params[:id].present?
        Item.find(params[:id]).sub_category.gosts.all
      else
        Gost.all
      end

      #app_f.input :item_gosts # it should automatically generate a drop-down select to choose from your existing patients
    end
    f.has_many :item_steel_marks, allow_destroy: true, new_record: true do |app_f|
      if !app_f.object.nil?
        # show the destroy checkbox only if it is an existing appointment
        # else, there's already dynamic JS to add / remove new appointments
        app_f.input :_destroy, :as => :boolean, :label => "Destroy?"
      end
      app_f.input :steel_mark, as: :select, collection: if params[:id].present?
        Item.find(params[:id]).sub_category.steel_marks.all
      else
        SteelMark.all
      end
  end
  f.input :description, :input_html => { :value => params[:description] } 
end
    f.button "Сохранить"
  end

这是一个活跃的admin cotroller。

controller do

    def new
      @item = Item.new
    end

    def create
      @item = Item.create(item_params)
      if @item.save
        flash[:success] = "Товар добавлен"
        redirect_to new_admin_item_path(:category_id => @item.category_id, :name => @item.name, price: @item.price, description: @item.description)
      else
         flash[:alert] = "ошибка"
         render 'new'
      end
    end

Answer 1

Formtastic（在AA中使用）has deprecated selected option。

您可以使用options_for_select。

看看例子：

collection: options_for_select([1,2,3], 2) # will make 2 a default value

所以在你的情况下你可以尝试：

 app_f.input :gost,
   as: :select,
   collection: options_for_select( (params[:id].present? ? Item.find(params[:id]).sub_category.gosts.all : Gost.all), Gost.first) # will make `Gost.first` a default value.

在这种情况下，确保Gost.first只是一个定义默认值的示例，您必须找出真正符合您要求的内容。

此部分(params[:id].present? ? Item.find(params[:id]).sub_category.gosts.all : Gost.all)使用ternary运算符，与if else语句相比更短（但仍然相同）。

如何在主动管理表单中使用has_many关系发送属性？

1 个答案: