如何让index view retrieve/output数据在posting form中提交顺序排列？

Question

使用嵌套表单，我创建了一个 post，它的顺序是 Text1、Url1、Text2.

但是，当我检索此数据（控制器索引操作）并将其显示在视图 (index.html.erb) 中时，它显示为 Text1、Text2、Url1 .我怎样才能让它以我在嵌套 posting 形式中给出的原始顺序显示在视图中？

你的帮助会很棒 - 我无法完成这项工作！

嵌套形式：

浏览器：

Post 型号

  class Post < ActiveRecord::Base
   has_many :texts
   has_many :urls 
   accepts_nested_attributes_for :texts, :urls
  end

文本模型

  class Text < ActiveRecord::Base
   belongs_to :post 
  end

Url 型号

  class Url < ActiveRecord::Base
   belongs_to :post
  end

架构

 create_table "posts", force: :cascade do |t|
   t.datetime "created_at", null: false
   t.datetime "updated_at", null: false
 end

 create_table "texts", force: :cascade do |t|
   t.text     "textattr"
   t.datetime "created_at", null: false
   t.datetime "updated_at", null: false
   t.integer  "post_id"
 end

 add_index "texts", ["post_id"], name: "index_texts_on_post_id"

 create_table "urls", force: :cascade do |t|
   t.string   "urlattr"
   t.datetime "created_at", null: false
   t.datetime "updated_at", null: false
   t.integer  "post_id"
 end

 add_index "urls", ["post_id"], name: "index_urls_on_post_id"

Post控制器

 class PostsController < ApplicationController

  def index
    @posts = Post.includes(:texts, :urls).all.order(created_at: :desc)
  end

  def show
   @post = Post.find(params[:id])
   @texts = @post.texts 
   @urls = @post.urls 
   @photos = @post.photos 
  end 

  def new
    @post = Post.new 
  end 

  def create
   @post = Post.new(post_params) 
    if @post.save 
     redirect_to @post
    else 
     render 'new'
    end 
  end


   private 
    def post_params 
        params.require(:post).permit(:texts_attributes => [:textattr], :urls_attributes => [:urlattr], :photos_attributes => [:image])
     end 
 end

查看（Index.html.erb）

<% @posts.each do |post| %> 

 <% post.texts.each do |text|%>
  <%= text.textattr %> <br> 
 <% end %>

 <% post.urls.each do |url|%>
  <%= url.urlattr %> <br> 
 <% end %> 

<% end %>

Answer 1

要补充 Pavan 的答案，您的模型结构有缺陷。

您正在尝试通过两个单独的模型提取组合数据。由于您希望它们在两种情况下都存在，我想说将它们放入一个模型中：

#app/models/post.rb
class Post < ActiveRecord::Base
  has_many :meta, class_name: "Meta"
  accepts_nested_attributes_for :meta
end

#app/models/meta.rb
class Meta < ActiveRecord::Base
  #id | text | url | created_at | updated_at
  belongs_to :post
end

这样，您将获得：

@posts.each do |post|
  post.meta.each do |meta|
    meta.try(:text)
    meta.try(:url)
  end
end

上述迁移将是：

 create_table "posts", force: :cascade do |t|
   t.datetime "created_at", null: false
   t.datetime "updated_at", null: false
 end

 create_table "metas", force: :cascade do |t|
   t.text     "text"
   t.string   "url"
   t.datetime "created_at", null: false
   t.datetime "updated_at", null: false
   t.integer  "post_id"
 end

如何让index view retrieve/output数据在posting form中提交顺序排列？

How to make the index view retrieve/output data in the order submitted in the posting form?

forms

jquery

ruby-on-rails

erb

ruby-on-rails-4