Ruby on rails Rails 5-使用多态关联-呈现视图

我正在尝试学习如何在Rails 5应用程序中使用多态关联。我最近问了一个问题，但我编辑了很多次来展示我所尝试的所有东西，结果变得一团糟

我有一个叫做组织、提案和包的模型：：Bip

这些协会是：

组织机构

has_many :bips, as: :ipable, class_name: Package::Bip
    accepts_nested_attributes_for :bips,  reject_if: :all_blank, allow_destroy: true

提议

has_many :bips, as: :ipable, class_name: Package::Bip
    accepts_nested_attributes_for :bips,  reject_if: :all_blank, allow_destroy: true

包：：Bip

belongs_to :ipable, :polymorphic => true, optional: true #, inverse_of: :bip

包：：Bip可以与组织或提案关联。我正在努力弄清楚如何在我的提案展示中展示只属于提案的包：：Bips，以及组织的包：：Bips

My package:：bip表有以下两列：

#  ipable_id      :integer
#  ipable_type    :string

ipable_类型设置为提案或组织

在我的提案中，我有：

<% if @proposal.bips.present? %>
    <%#= render @proposal.bips %>
     <%= link_to proposal_package_bips_path(@proposal) do %> 
     <% end %>
<% end %>

在我的包：：BipsController中，我有

def index

    if params[:ipable_type] == "Proposal"
      @bips = Package::Bip.where(:ipable_type == 'Proposal')
    else params[:ipable_type] ==  'Organisation'
      @bips = Package::Bip.where(:ipable_type == 'Organisation')
    end

但是，当我保存所有这些并尝试它时，我得到了错误的结果

目前，数据库中有4个Package:：Bip实例

Package::Bip.pluck(:ipable_type)
   (0.8ms)  SELECT "package_bips"."ipable_type" FROM "package_bips"
 => ["Proposal", "Proposal", "Proposal", "Organisation"] 

3个属于提案，1个属于组织

属于提案的3个提案都属于不同的提案

Package::Bip.pluck(:ipable_id)
   (0.8ms)  SELECT "package_bips"."ipable_id" FROM "package_bips"
 => [15, 13, 16, 1] 

我的目标是，提案展示视图或组织展示视图应仅显示属于该具体提案的BIP

Package::Bip.pluck(:ipable_id)
   (0.8ms)  SELECT "package_bips"."ipable_id" FROM "package_bips"
 => [15, 13, 16, 1] 

但是，当我提交我的提案时，显示的是：

<%= link_to proposal_package_bips_path(@proposal) do %> 

在控制台中，我可以使用要应用的过滤器进行搜索

p = Proposal.last
  Proposal Load (4.8ms)  SELECT  "proposals".* FROM "proposals" ORDER BY "proposals"."id" DESC LIMIT $1  [["LIMIT", 1]]
 => #<Proposal id: 16, user_id: 4, title: "test tenor", description: "test tenor",  created_at: "2016-11-08 21:58:38", updated_at: "2016-11-08 21:58:38"> 
2.3.1p112 :199 > p.bips
  Package::Bip Load (0.3ms)  SELECT "package_bips".* FROM "package_bips" WHERE "package_bips"."ipable_id" = $1 AND "package_bips"."ipable_type" = $2  [["ipable_id", 16], ["ipable_type", "Proposal"]]
 => #<ActiveRecord::Associations::CollectionProxy [#<Package::Bip id: 19, identifier: "test tenor", description: nil, conditions: "test tenor", ipable_id: 16, ipable_type: "Proposal", created_at: "2016-11-08 21:58:38", updated_at: "2016-11-08 21:58:38", title: "test tenor", status: nil, classification: "Copyright">]> 
2.3.1p112 :200 > p.bips.count
   (3.5ms)  SELECT COUNT(*) FROM "package_bips" WHERE "package_bips"."ipable_id" = $1 AND "package_bips"."ipable_type" = $2  [["ipable_id", 16], ["ipable_type", "Proposal"]]
 => 1 

结束

bip = Package::Bip.new
Package::Bip.ipable = parent
# @bip = Package::Bip.new(bip_params)
# authorize @bip

respond_to do |format|
  if @bip.save
    format.html { redirect_to @bip }
    format.json { render :show, status: :created, location: @bip }
  else
    format.html { render :new }
    format.json { render json: @bip.errors, status: :unprocessable_entity }
  end
end

将提案视图更改为：

当我尝试此操作时，没有出现错误，但所有的Package:：BIP都显示在proposal show视图中

尽管存在具有组织id的Package:：Bips，但仍然存在这种情况

Package::Bip.all.pluck(:ipable_type)
   (0.9ms)  SELECT "package_bips"."ipable_type" FROM "package_bips"
 => ["Proposal", "Proposal", "Proposal", "Organisation", "Proposal"] 

当我重新启动服务器并重试时，会收到一条错误消息，上面显示：

undefined method `package_bip_path' for #<#<Class:0x007fbce68389c0>:0x007fbcfdc31c18>

undefined method `empty?' for #<Class:0x007ff20920e218>

这显示了一个类似的问题，可以通过向路径中添加“[]”来解决

当我尝试时：

<%= link_to polymorphic_path([@proposal, Package::Bip]) do  %>

日志似乎没有显示任何迹象表明它正在将提案或提案id筛选器应用于包bips

这对我来说没有任何意义，因为我的路线只有前缀“Organization”或“proposal”才可用：

rake routes | grep package_bip
            organisation_package_bips GET      /organisations/:organisation_id/package/bips(.:format)                  package/bips#index
         new_organisation_package_bip GET      /organisations/:organisation_id/package/bips/new(.:format)              package/bips#new
        edit_organisation_package_bip GET      /organisations/:organisation_id/package/bips/:id/edit(.:format)         package/bips#edit
             organisation_package_bip GET      /organisations/:organisation_id/package/bips/:id(.:format)              package/bips#show
                proposal_package_bips GET      /proposals/:proposal_id/package/bips(.:format)                          package/bips#index
             new_proposal_package_bip GET      /proposals/:proposal_id/package/bips/new(.:format)                      package/bips#new
            edit_proposal_package_bip GET      /proposals/:proposal_id/package/bips/:id/edit(.:format)                 package/bips#edit
                 proposal_package_bip GET      /proposals/:proposal_id/package/bips/:id(.:format)                      package/bips#show

此外，当我尝试在最后一篇链接文章中使用显示路径时，在我的视图/package/bips/index.html.erb中，如下所示：

 <% @bips.each do |ip| %>
    <%= link_to polymorphic_path([@ipable, ip]) %>

在控制台中，我尝试：

params = {:proposal_id => 15}
 => {:proposal_id=>15} 


2.3.1p112 :031 > @proposal = Proposal.find(params[:proposal_id])
  Proposal Load (0.7ms)  SELECT  "proposals".* FROM "proposals" WHERE "proposals"."id" = $1 LIMIT $2  [["id", 15], ["LIMIT", 1]]
 => #<Proposal id: 15, user_id: 4, title: "testing filter", description: "testing filter", byline: "testing filter", nda_required: true, created_at: "2016-11-08 00:59:09", updated_at: "2016-11-08 00:59:09"> 

2.3.1p112 :033 > @proposal.bips
  Package::Bip Load (0.7ms)  SELECT "package_bips".* FROM "package_bips" WHERE "package_bips"."ipable_id" = $1 AND "package_bips"."ipable_type" = $2  [["ipable_id", 15], ["ipable_type", "Proposal"]]
 => #<ActiveRecord::Associations::CollectionProxy [#<Package::Bip id: 17, identifier: "testing filter", description: nil, conditions: "testing filter", ipable_id: 15, ipable_type: "Proposal", created_at: "2016-11-08 00:59:09", updated_at: "2016-11-08 00:59:09", title: "testing filter", status: nil, classification: "Patent">, #<Package::Bip id: 21, identifier: "dd", description: nil, conditions: "dd", ipable_id: 15, ipable_type: "Proposal", created_at: "2016-11-10 22:47:54", updated_at: "2016-11-10 22:47:54", title: "ldsjflkjklsdjfl", status: nil, classification: "Design">]> 
2.3.1p112 :034 > @proposal.bips.count
   (6.3ms)  SELECT COUNT(*) FROM "package_bips" WHERE "package_bips"."ipable_id" = $1 AND "package_bips"."ipable_type" = $2  [["ipable_id", 15], ["ipable_type", "Proposal"]]
 => 2 

当我尝试这一点时，我可以探索提案参数：

params
<ActionController::Parameters {"controller"=>"proposals", "action"=>"show", "id"=>"15"} permitted: false>
(byebug) proposal_params
*** ActionController::ParameterMissing Exception: param is missing or the value is empty: proposal

nil

我认为这是正确的

这些消息很奇怪，因为我还可以浏览BYEBug语句中的每个白名单项，并得到正确的响应。例如：

 @proposal.id
15

当我尝试在Package:：bips controller、index action中使用bye bug进行探索时，我可以看到：

params.inspect
"<ActionController::Parameters {\"controller\"=>\"package/bips\", \"action\"=>\"index\", \"proposal_id\"=>\"15\"} permitted: false>"

params.inspect
“\”程序包/bips\“，\”操作\“=>”索引\“，\”建议id \“=>”15\“}允许：false>”

allowed:false属性似乎是我代码中的一个问题

这是我的下一个问题。

答案如下：

技巧似乎在于本文中所示的load_commentable方法。这对我来说太复杂了，弄不懂它的意思，但它是有效的

---

非常感谢那些乐于分享他们所知的人们所给予的帮助。谢谢Taryn&Bala。

好的，所以您目前没有向我们展示您如何在控制器中设置

@proposal

。（这可能不相关，但我们拭目以待）。在您的控制台中，如果您确实执行控制器将执行的操作，这将是一件好事-例如，不要执行

p=Proposal.last

do

params={:Proposal\u id=>0}

then

@Proposal=Proposal.find（params[:Proposal\u id]）

（或控制器中的任何内容）。然后尝试

@proposal.bips

。我将在控制器中进行更多的日志记录，并尝试查找bip fetch的源代码。谢谢你的建议，我放弃了。我将为提案/组织BIP提供两个单独的资源，然后继续。这太难理解了，如果我坚持努力学习，我就不会在另一个黑暗的世界里迷失。“非常感谢你仍然试图帮助我。”@TarynEast-我几乎不敢相信，但我找到了答案。在这篇文章中，你可能会像我一样对load_commentable方法有更多的了解。再次非常感谢您在这方面的帮助。我讨厌放弃一切。：）

Started GET "/proposals/15/package/bips" for ::1 at 2016-11-13 11:24:32 +1100
Processing by Package::BipsController#index as HTML
  Parameters: {"proposal_id"=>"15"}
  User Load (1.1ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1 ORDER BY "users"."id" ASC LIMIT $2  [["id", 4], ["LIMIT", 1]]
  Rendering package/bips/index.html.erb within layouts/application
  Package::Bip Load (0.6ms)  SELECT "package_bips".* FROM "package_bips"
  Rendered package/bips/index.html.erb within layouts/application (5.4ms)

rake routes | grep package_bip
            organisation_package_bips GET      /organisations/:organisation_id/package/bips(.:format)                  package/bips#index
         new_organisation_package_bip GET      /organisations/:organisation_id/package/bips/new(.:format)              package/bips#new
        edit_organisation_package_bip GET      /organisations/:organisation_id/package/bips/:id/edit(.:format)         package/bips#edit
             organisation_package_bip GET      /organisations/:organisation_id/package/bips/:id(.:format)              package/bips#show
                proposal_package_bips GET      /proposals/:proposal_id/package/bips(.:format)                          package/bips#index
             new_proposal_package_bip GET      /proposals/:proposal_id/package/bips/new(.:format)                      package/bips#new
            edit_proposal_package_bip GET      /proposals/:proposal_id/package/bips/:id/edit(.:format)                 package/bips#edit
                 proposal_package_bip GET      /proposals/:proposal_id/package/bips/:id(.:format)                      package/bips#show

 <% @bips.each do |ip| %>
    <%= link_to polymorphic_path([@ipable, ip]) %>

undefined method `package_bip_path' for #<#<Class:0x007f9e8ac29248>:0x007f9e939c9508>

def set_proposal
   @proposal = Proposal.find(params[:id])
end

params = {:proposal_id => 15}
 => {:proposal_id=>15} 


2.3.1p112 :031 > @proposal = Proposal.find(params[:proposal_id])
  Proposal Load (0.7ms)  SELECT  "proposals".* FROM "proposals" WHERE "proposals"."id" = $1 LIMIT $2  [["id", 15], ["LIMIT", 1]]
 => #<Proposal id: 15, user_id: 4, title: "testing filter", description: "testing filter", byline: "testing filter", nda_required: true, created_at: "2016-11-08 00:59:09", updated_at: "2016-11-08 00:59:09"> 

2.3.1p112 :033 > @proposal.bips
  Package::Bip Load (0.7ms)  SELECT "package_bips".* FROM "package_bips" WHERE "package_bips"."ipable_id" = $1 AND "package_bips"."ipable_type" = $2  [["ipable_id", 15], ["ipable_type", "Proposal"]]
 => #<ActiveRecord::Associations::CollectionProxy [#<Package::Bip id: 17, identifier: "testing filter", description: nil, conditions: "testing filter", ipable_id: 15, ipable_type: "Proposal", created_at: "2016-11-08 00:59:09", updated_at: "2016-11-08 00:59:09", title: "testing filter", status: nil, classification: "Patent">, #<Package::Bip id: 21, identifier: "dd", description: nil, conditions: "dd", ipable_id: 15, ipable_type: "Proposal", created_at: "2016-11-10 22:47:54", updated_at: "2016-11-10 22:47:54", title: "ldsjflkjklsdjfl", status: nil, classification: "Design">]> 
2.3.1p112 :034 > @proposal.bips.count
   (6.3ms)  SELECT COUNT(*) FROM "package_bips" WHERE "package_bips"."ipable_id" = $1 AND "package_bips"."ipable_type" = $2  [["ipable_id", 15], ["ipable_type", "Proposal"]]
 => 2 

def show
    @images = @proposal.images
    byebug
    puts 'testing proposal controller'
    @bips = @proposal.bips#.where(ipable_type: 'Proposal')
  end

params
<ActionController::Parameters {"controller"=>"proposals", "action"=>"show", "id"=>"15"} permitted: false>
(byebug) proposal_params
*** ActionController::ParameterMissing Exception: param is missing or the value is empty: proposal

nil

def proposal_params
      params.require(:proposal).permit(:title, :description, :byline, :nda_required, :randd_maturities_list,
        #Package
        bips_attributes:            [:id, :status, :classification, :identifier, :conditions, :title, :_destroy,
          tenor_attributes:           [:id, :express_interest, :commencement, :expiry, :enduring, :repeat, :frequency, :_destroy]

        ],


       )
    end

 @proposal.id
15

params.inspect
"<ActionController::Parameters {\"controller\"=>\"package/bips\", \"action\"=>\"index\", \"proposal_id\"=>\"15\"} permitted: false>"