Rails 5 - 使用多态关联 - 呈现视图

Question

我正在尝试学习如何在我的Rails 5应用程序中使用多态关联.我最近问了这个问题,但是我编辑了很多次来展示我正在尝试的所有东西,它变得一团糟

我的模型叫做Organization,Proposal和Package :: Bip.

协会是:

组织

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

提案

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

套票:必必

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

Package :: Bip可以与Organization或Proposal相关联.我正在努力弄清楚如何在我的提案节目中展示仅属于提案的Package :: Bips,以及组织的相同内容.

我的package :: bip表有以下两列:

#  ipable_id      :integer
#  ipable_type    :string

ipable_type设置为Proposal或Organization.

在我的提案节目中,我有:

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

我找到了这篇文章.我理解这意味着我也应该能够尝试这个:我也尝试过:

<% if @proposal.bips.present? %>
    <%= render @proposal.bips %>
<% end %>

我认为(@ proposal)应该是决定返回哪个package_bip实例的约束因素.但事实并非如此.我不确定它在做什么,因为所有package_bips都被渲染(包括与组织相关的那些).

在我的提案控制器中,我有:

 def index
    @proposals = Proposal.all
    # @bips = @proposal.bips
    # authorize @proposals
  end


def show
    @bips = @proposal.bips#.where(ipable_type: 'Proposal')
end

在我的Package :: 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,db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属于提案,1属于组织.

属于提案的3个属于不同的提案.

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该只显示属于该特定提案的Bips.

但是,当我渲染我的提案显示视图时,它具有:

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

反过来,我的views/package/bips/index.html.erb有:

<% @bips.each do |ip| %>
   <%= ip.title.titleize %>
      <%#= link_to 'More details', package_bip_path(ip) %> 

我希望这个视图呈现一个包含1个package_bip实例的列表.相反,我会列出所有4个实例(提案中的2个.bips属于不同的提案,其中一个提交属于组织).这些都不应该在索引中呈现.

此外,我无法在bips/index.html.erb中添加bips/show.html.erb中的链接.这是因为该链接看起来像:

<%= link_to 'More details', package_bip_path(ip) %> <

当我尝试使用该链接呈现索引时,我收到一条错误消息:

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

我想这个链接可能需要包含提案或组织.

我的路线是嵌套的:

resources :proposals do 
    namespace :package do
      resources :bips 
    end

resources :organisations do 
  namespace :package do
    resources :bips 
  end

从控制台,我可以使用我想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 

但是,在我的任何尝试中,这都不会延续到代码中.

任何人都可以向我推荐资源,可以帮助我弄清楚如何设置我的多态视图,以便它们正常过滤,以便我可以使用典型的索引链接(例如,显示/编辑),以便它们可以被识别为属于提案/组织的一个或另一个？

UPDATE

我现在发现了这篇文章.

我尝试采用它建议的过程:

1. 将提案控制器中的创建操作更改为:

   def create if params [:organisation_id] parent = Organisation.find(params [:organisation_id])elsif params [:proposal_id] parent = Proposal.find(params [:proposal_id])end

   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
   

   结束

2. 将提案视图更改为:

当我尝试这个时,我没有得到任何错误,但是所有的Package :: Bips都显示在提案显示视图中.

尽管存在具有组织ID的Package :: Bips.

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再试一次时,我收到一条错误消息:

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

错误消息指向我的新行:

<%= polymorphic_path(@proposal, Package::Bip) %>

日志显示:

Started POST "/__better_errors/3f34303f5f5c670f/variables" for ::1 at 2016-11-13 10:58:13 +1100
  Package::Bip Load (0.4ms)  SELECT "package_bips".* FROM "package_bips" WHERE "package_bips"."ipable_id" = $1 AND "package_bips"."ipable_type" = $2  [["ipable_id", 15], ["ipable_type", "Proposal"]]

这篇文章显示了一个类似的问题,通过在路径中添加'[]'来解决.

然后当我尝试:

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

我仍然得到所有bips的列表(即使属于组织或具有不同id的提议的bips).

我从日志中可以看到的可能是一个线索(如果是 - 它超越我的头脑).

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)

日志似乎没有显示任何迹象表明它正在将提案或提案ID过滤器应用于package_bips.

这对我没有任何意义,因为我的路线只有组织或提案的前缀:

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

更进一步,当我尝试在最后一个链接的帖子中使用show path时,在我的views/package/bips/index.html.erb中:

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

然后我得到一个错误,上面写着:

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

TARYN对于寻找问题的建议

背景.在我的提案控制器中,我的提案定义为:

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

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 

这给出了正确的结果.

在提案控制器中,显示操作,我有:

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

当我尝试这个时,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

其他有此问题的人将其归因于强params方法中的'require'语句.

我的proposal_params定义为:

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

我认为是正确的.

这些消息虽然很奇怪,因为我也可以通过再见bug语句中的每个列入白名单的项目并获得正确的响应.例如:

 @proposal.id
15

当我尝试使用Package :: bips控制器中的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>"

允许的:false属性似乎是我的代码中的一个问题.

这是我的下一行调查.

Answer 1

答案在这里：https ://rubyplus.com/articles/3901-Polymorphic-Association-in-Rails-5

技巧似乎就在文章中显示的 load_commentable 方法中。这对我来说太复杂了，无法理解，但它确实有效。

非常感谢人们乐于分享他们所知道的事情所提供的帮助。谢谢塔林和巴拉。