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 的表格，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，因为我的关系是和外键一起设置的。我有另一个带有复选框的模型，名为 Uploadpdf，效果很好。

这是设置..

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

views/campaigns/_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

我已经按照建议更改了代码以更好地反映外键。现在已成功创建活动，但未与所选 uploadzip Zip 文件相关联。当调用 @campaign.uploadzip 时，它 returns 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" } %>

我也把控制器params.require改成了..

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

Answer 1

根据您的协会设置，foreign_key 应该是 campaign_id 而不是 uploadzip_id。您应该根据您的用例更改 associations 或 foreign_key。

我还建议您关注这些 Guides 以了解更多关于协会的信息。

Answer 2

302 重定向可能不是坏事，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

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

..遇到了更改 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" } %>

Rails 4.2：日志中的未知属性或服务器错误

Rails 4.2: Unknown Attribute or Server Error in Log

ruby

ruby-on-rails

actionview

ruby-on-rails-4

rails-activerecord