Rails 4.2：日志中的未知属性或服务器错误

Question

我有一个带有select_tag 和options_from_collection_for_select 的表单，我似乎无法通过。在视图中，当上传 id 设置为 uploadzip_id 时，我得到一个 302 重定向，当它设置为 uploadzip_ids 时，我得到一个 Unknown Attribute 错误。

我有点困惑，因为我的关系与外键一起设置。我确实有另一个带有复选框的模型，称为Uploadpdf，它工作正常。

这里是设置..

class Campaign < ActiveRecord::Base
    has_one :uploadzip
end

class Uploadzip < ActiveRecord::Base
    belongs_to :campaign
end

db/schema.rb

  create_table "campaigns", force: :cascade do |t|
    t.string   "name"
    t.text     "comment"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false

  create_table "uploadzips", force: :cascade do |t|
    t.string   "file_name"
    t.string   "file_type"
    t.datetime "date"
    t.integer  "size"
    t.integer  "pages"
    t.string   "file_ident"
    t.string   "md5"
    t.datetime "created_at",  null: false
    t.datetime "updated_at",  null: false
    t.integer  "campaign_id"
  end

  add_foreign_key "uploadzips", "campaigns"

app/controllers/campaign_controller.rb

class CampaignsController < ApplicationController
      def index
        @campaigns = Campaign.all.order("created_at DESC")
      end

      def new
        @campaign = Campaign.new
      end

      def create
        @campaign = Campaign.new(campaign_params)

        if @campaign.save
            flash[:success] = "Campaign Successfully Launched!"
            redirect_to @campaign
        else
            flash[:error] = "There was a problem launching your Campaign."
            redirect_to new_campaign_path
        end
      end

    .....

  private

      def campaign_params
        params.require(:campaign).permit(:name, :comment, :uploadzip_ids, uploadpdf_ids: [])
      end
end

观看次数/广告系列/_form.rb

<%= form_for @campaign, url: {action: "create"} do |f| %>

    .....some typical fields..

    <%= f.label :data_file, class: "right-label" %>

    <%= select_tag campaign[uploadzip_ids], 
                options_from_collection_for_select(
                Uploadzip.all, :id, :file_name
                ), { include_blank: "Include a Zip File" } %>

    .....some more typical fields

<% end %>

更新

我已更改代码以更好地反映建议的外键。创建活动现已成功，但与所选的uploadzip Zip 文件没有关联。调用@campaign.uploadzip 时，返回nil。

这是更新后的代码：

<%= select_tag "uploadzip[campaign_id]",
    options_from_collection_for_select(
    Uploadzip.all, :id, :file_name
    ), { include_blank: "Include a Zip File" } %>

我还把控制器params.require改成了..

  def campaign_params
    params.require(:campaign).permit(:name, :comment, :campaign_id, uploadpdf_ids: [])
  end

Answer 1

FaceBook 小组的成员通过添加一点帮助我解决了这个问题 控制器中的额外逻辑..

  if @campaign.save

    zip = Uploadzip.find(params[:uploadzip_id])
    zip.campaign = @campaign
    zip.save

    flash[:success] = "Campaign Successfully Launched!"
    redirect_to @campaign
  else
    flash[:error] = "There was a problem launching your Campaign."
    redirect_to new_campaign_path
  end

..更改了 select_tag 的名称。

  <%= select_tag :uploadzip_id,
      options_from_collection_for_select(
      Uploadzip.all, :id, :file_name
      ), { include_blank: "Include a Zip File" } %>

Answer 2

302 重定向可能不是一件坏事，因为您正在执行redirect_to new_campaign_path。当您在视图和控制器params.permit 部分中使用uploadzip_id 时，记录是否正确创建？

Answer 3

根据您的关联设置，foreign_key 应该是 campaign_id 而不是 uploadzip_id。您应该根据您的用例更改您的 associations 或 foreign_key。

我还建议您关注这些Guides 以了解有关关联的更多信息。