Question

我提交的表单存在以下问题：

未填写的参数传递and 找不到所传递的关联模型属性。

表格：

...
<% PrintLocation.all.each.with_index do |print_location, index| %>
   <%= print_location.title %>
   <%= f.fields_for :shop_product_print_files_attributes, index: index, multiple: true do |a| %>
       <%= a.text_field :print_file %>
       <%= a.hidden_field :print_location_id, value: print_location.id %>
       <%= a.hidden_field :shop_product_id, value: shop_product.id %>
   <% end %>
<% end %>
...

传递参数：

, "shop_product_print_files_attributes"=>{"0"=>{"print_file"=>"a", "print_location_id"=>"1", "shop_product_id"=>"45"}, "1"=>{"print_file"=>"", "print_location_id"=>"2", "shop_product_id"=>"45"}, "2"=>{"print_file"=>"", "print_location_id"=>"3", "shop_product_id"=>"45"}, "3"=>{"print_file"=>"", "print_location_id"=>"4", "shop_product_id"=>"45"}, "4"=>{"print_file"=>"", "print_location_id"=>"5", "shop_product_id"=>"45"}, "5"=>{"print_file"=>"", "print_location_id"=>"6", "shop_product_id"=>"45"}},

型号：

class ShopProductPrintFile < ApplicationRecord
  belongs_to :shop_product
  belongs_to :print_location
end

class PrintLocation < ApplicationRecord
  has_many :shop_products, through: :shop_product_print_files
  has_many :shop_product_print_files
  accepts_nested_attributes_for :shop_product_print_files
end

class ShopProduct < ApplicationRecord
...
  has_many :shop_product_print_files
  has_many :print_locations, through: :shop_product_print_files
  accepts_nested_attributes_for :shop_product_print_files

end

控制器：

  def new
    @shop_product = ShopProduct.new
    @shop_product.shop_product_print_files.build
  end

  def create
    @shop_product = ShopProduct.new(shop_product_params)
    @shop_product.shop_product_print_files.build(print_location_id: params["shop_product"]["shop_product_print_files_attributes"]["print_location_id"])
    shop = Shop.find(params["shop_product"]["shop_id"])
    product = Product.find(params["shop_product"]["product_id"])
    @shop_product.product_id = product.id
    @shop_product.shop_id = shop.id

    respond_to do |format|
      if @shop_product.save!
        ...
    end
  end

  def update
    @shop_product = ShopProduct.find_by(store_variant_id: params["shop_product"]["store_variant_id"])
    @shop_product.shop_product_print_files.build(shop_product_id: @shop_product.id, print_location_id: params["shop_product"]["shop_product_print_files_attributes"]["print_location_id"])
    @product = Product.find(params["shop_product"]["product_id"])

    respond_to do |format|
      if @shop_product.update(shop_product_params)
        ...
    end
  end

private

def shop_product_params
   params.require(:shop_product).permit(...., :shop_product_print_files_attributes => [:id, :print_file, :print_location_id, :shop_product_id])
end

错误：

Shop product print files print location must exist

最大的问题是找不到print_location，但是为什么不呢？

除此之外，为什么即使print_file为空也要发送所有参数？

在我没有使用each.with_index和表单中使用index: index之前。这样，表单将提交并创建shop_product_print_files，但是问题在于它只会传递PrintLocation循环中的最后一个值，"6"和1-5将被废弃。当我安装使用索引代码时，一切都会通过，但一切都会通过，并且不会因上述错误而被保存。

我该怎么做，才能使通过的参数不为空，并找到它们？

fields_for形式with_index找不到参数

0 个答案: