Question

目标：以一种形式更新多个记录。每条记录通过shop_product_print_file具有许多print_locations

有6个可能的打印位置

型号：

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 ShopProductPrintFile < ApplicationRecord
  belongs_to :shop_products
  belongs_to :print_locations
  belongs_to :image_file
end

class ShopProduct < ApplicationRecord
    ...
  has_many :shop_product_print_files
  has_many :print_locations, through: :shop_product_print_files
  accepts_nested_attributes_for :print_locations
  accepts_nested_attributes_for :shop_product_print_files
    ...
end
class ImageFile < ApplicationRecord
  # this is where users upload files to
  belongs_to :user
  has_many :shop_product_print_files
end

数组的形式（我选择要复选框更新的记录）：

<%= form_tag edit_multiple_shop_products_path, method: :put do %>
  <% @shop_products.each do |shop_product| %>
      <%= hidden_field_tag "shop_product_ids[]", shop_product.id %>
      <%= shop_product.id %>
    <% end %>
  <%= fields_for :shop_product do |f| %>
    <%= f.fields_for :shop_product_print_files do |ff| %>
      <%= ff.object.print_location.title %>
              <%= ff.hidden_field :print_location_id %>
              <%= ff.select :image_file_id, options_for_select(@image_files.map { |image| [image.id, {'data-img-src'=>image.image_file_url(:thumb)}]}), {:include_blank => 'Choose None'}, class: "image-picker" %>
              Upload: <%= link_to "Add Image", user_files_path %>
    <% end %>
  <% end %>
  <%= submit_tag "Edit Checked" %>
<% end %>

控制器：

def edit_multiple
  @image_files = ImageFile.where(user_id: current_user.id)

  @shop_products = ShopProduct.find(params[:shop_product_ids])

end

def update_multiple
  @shop_products = ShopProduct.find(params[:shop_product_ids])
  @image_files = ImageFile.where(user_id: current_user.id)

  @shop_products.reject! do |shop_product|
      shop_product.update_attributes(params[:shop_product].reject { |k,v| v.blank? })
 end
  if @shop_products.empty?
    redirect_to shop_products_url
  else
    @shop_product = ShopProduct.new(params[:shop_product])
    render "edit_multiple"
  end
end

我尝试使用：

<% PrintLocation.all.each{|p| shop_product.shop_product_print_files.build(print_location: p) if shop_product.shop_product_print_files.where(print_location: p).empty? } %>

但是，我仍然收到错误消息：

(undefined method `print_location' for nil:NilClass)

这在使用form_for一次更新1条记录时有效。

我在做错什么而无法使用数组？如何使print_locations成功显示？

此外，为了澄清，这是在创建ShopProduct之后发生的。因此，这基本上是更新现有的ShopProducts。哪个让我感到困惑，因为如果它存在，则该关联应该已经存在，但不知何故？

如何在多个记录的数组上使用.build？

0 个答案: