Rails 4 ActiveRecord与嵌套表单字段的关联

时间：2014-06-22 18:15:19

标签： ruby-on-rails-4 rails-activerecord

我阅读了所有可以抓住的一半，虽然有一些非常清楚的解释我想要做什么，但我找不到最新的完整教程。我有页面和类别。 Pages has_many类别和类别has_many。我还设置了第3个模型categories_pages并创建了一个索引连接表，其中包含2列（category_id＆amp; page_id）。所以我的模特目前是：

class Categorization < ActiveRecord::Base

belongs_to :category
belongs_to :page
end


class CategoriesPages < ActiveRecord::Base

belongs_to :category
belongs_to :page
end

class Page < ActiveRecord::Base

#categories
has_many :categories_pages
has_many :categories, :through => :categories_pages
end

然后我有一个这样的表格（请忽略上面的页面模型中缺少回形针代码..我从这个例子中剪了它但可以确认上传文件应该如此）。 

    <%= form_for(@page) do |f| %>
  <% if @page.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@page.errors.count, "error") %> prohibited this page from being saved                          </h2>

      <ul>
      <% @page.errors.full_messages.each do |message| %>
        <li><%= message %></li>
      <% end %>
      </ul>
    </div>
  <% end %>

  <form role="form">
    <div class="form-group">
      <%= f.label :title %><br>
      <%= f.text_field :title, :class => 'form-control' %>
    </div>
    <div class="form-group">
      <%= f.label :text %><br>
      <%= f.text_field :text, :class => 'form-control' %>
    </div>
    <div class="form-group">
      <%= form_for @page, :url => pages_path, :html => { :multipart => true } do |form| %>
        <%= form.file_field :image %>
      <% end %>
    </div>
    <div class="form-group">
      <%= f.fields_for :category do |cat| %>
        <%= cat.label :name, 'Category' %> </br>
        <%= cat.text_field :name %>
      <% end %>
    </div>
    <div class="form-group">
      <%= f.label :published %><br>
      <%= f.check_box :published, :class => 'checkbox' %>
    </div>
    <div class="form-group">
      <%= f.label :seo_keywords, 'SEO Keywords' %><br>
      <%= f.text_field :seo_keywords, :class => 'form-control' %>
    </div>
    <div class="form-group">
      <%= f.label :seo_description, 'SEO Description' %><br>
      <%= f.text_field :seo_description, :class => 'form-control' %>
    </div>
    <div class="action">
      <%= f.submit 'Save', :class => 'btn btn-default' %>
    </div>
  </form>

<% end %>

我的问题是我将什么放入控制器/ s（假设上面的代码检出）。我还没有找到关于此的最新信息。 Railscasts已经过时了，我读的越多（我从昨天起就一直试图解决这个问题），我越是圈起来。目前，我在编辑或新视图中进行了表单渲染，但保存按钮完全没有响应。我不确定我的控制器代码是否正确（只有我使用rails的第二周）所以我还没有发布它。任何帮助将不胜感激。

编辑1：

我忘记了这条至关重要的信息。表单呈现没有错误但是提交按钮没有响应（我点击它没有任何反应）。删除类别字段时，表单保存正常。

编辑2：记录信息

Started GET "/pages/8/edit" for 127.0.0.1 at 2014-06-23 03:27:33 +0800
Processing by PagesController#edit as HTML
  Parameters: {"id"=>"8"}
  [1m[36mPage Load (1.3ms)[0m  [1mSELECT  `pages`.* FROM `pages`  WHERE `pages`.`id` = 8 LIMIT 1[0m
  Rendered pages/_form.html.erb (29.9ms)
  Rendered pages/edit.html.erb within layouts/application (31.7ms)
  [1m[35mUser Load (2.7ms)[0m  SELECT  `users`.* FROM `users`  WHERE `users`.`id` = 4 LIMIT 1
Completed 200 OK in 184ms (Views: 67.8ms | ActiveRecord: 88.1ms)


Started GET "/assets/categories.css?body=1" for 127.0.0.1 at 2014-06-23 03:27:34 +0800


Started GET "/assets/menu.css?body=1" for 127.0.0.1 at 2014-06-23 03:27:34 +0800


Started GET "/assets/adminpanel.css?body=1" for 127.0.0.1 at 2014-06-23 03:27:34 +0800


Started GET "/assets/posts.css?body=1" for 127.0.0.1 at 2014-06-23 03:27:34 +0800


Started GET "/assets/pages.css?body=1" for 127.0.0.1 at 2014-06-23 03:27:34 +0800


Started GET "/assets/sessions.css?body=1" for 127.0.0.1 at 2014-06-23 03:27:34 +0800


Started GET "/assets/scaffolds.css?body=1" for 127.0.0.1 at 2014-06-23 03:27:34 +0800


Started GET "/assets/users.css?body=1" for 127.0.0.1 at 2014-06-23 03:27:34 +0800


Started GET "/assets/bootstrap.min.css?body=1" for 127.0.0.1 at 2014-06-23 03:27:34 +0800


Started GET "/assets/jquery_ujs.js?body=1" for 127.0.0.1 at 2014-06-23 03:27:34 +0800


Started GET "/assets/jquery.js?body=1" for 127.0.0.1 at 2014-06-23 03:27:34 +0800


Started GET "/assets/categories.js?body=1" for 127.0.0.1 at 2014-06-23 03:27:34 +0800


Started GET "/assets/posts.js?body=1" for 127.0.0.1 at 2014-06-23 03:27:34 +0800


Started GET "/assets/application.css?body=1" for 127.0.0.1 at 2014-06-23 03:27:34 +0800


Started GET "/assets/sessions.js?body=1" for 127.0.0.1 at 2014-06-23 03:27:34 +0800


Started GET "/assets/menu.js?body=1" for 127.0.0.1 at 2014-06-23 03:27:34 +0800


Started GET "/assets/adminpanel.js?body=1" for 127.0.0.1 at 2014-06-23 03:27:34 +0800


Started GET "/assets/application.js?body=1" for 127.0.0.1 at 2014-06-23 03:27:34 +0800


Started GET "/assets/turbolinks.js?body=1" for 127.0.0.1 at 2014-06-23 03:27:34 +0800


Started GET "/assets/bootstrap.min.js?body=1" for 127.0.0.1 at 2014-06-23 03:27:34 +0800


Started GET "/assets/pages.js?body=1" for 127.0.0.1 at 2014-06-23 03:27:34 +0800


Started GET "/assets/users.js?body=1" for 127.0.0.1 at 2014-06-23 03:27:34 +0800

编辑3：pages_controller 

class PagesController < ApplicationController
  before_action :set_page, only: [:show, :edit, :update, :destroy]

  # GET /pages
  # GET /pages.json
  def index
      @pages = Page.all
  end

  # GET /pages/1
  # GET /pages/1.json
  def show
    @page = Page.new(page_params)
  end

  # GET /pages/new
  def new
    @category = Category.new
    @page = Page.new
  end

  # GET /pages/1/edit
  def edit

  end


  # POST /pages
  # POST /pages.json
  def create
    @page = Page.new(page_params)
    @category = @page.build_category(category_params)

    respond_to do |format|
      if @page.save
        format.html { redirect_to @page, notice: 'Page was successfully created.' }
        format.json { render :show, status: :created, location: @page }
      else
        format.html { render :new }
        format.json { render json: @page.errors, status: :unprocessable_entity }
      end
    end
  end


  # PATCH/PUT /pages/1
  # PATCH/PUT /pages/1.json
  def update
    @page = Page.new(page_params)
    @category = @page.category

    @category.assign_attributes(category_params)
    respond_to do |format|
      if @page.update_attributes(page_params)
        format.html { redirect_to @page, notice: 'Page was successfully updated.' }
        format.json { render :show, status: :ok, location: @page }
      else
        format.html { render :edit }
        format.json { render json: @page.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /pages/1
  # DELETE /pages/1.json
  def destroy
    @page.destroy
    respond_to do |format|
      format.html { redirect_to pages_url, notice: 'Page was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_page
      @page = Page.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def page_params
      params.require(:page).permit(:title, :text, :image, :published, :seo_keywords, :seo_description)
    end

    def category_params
      params.require(:category).permit(:name)
    end
end

1 个答案:

答案 0 :(得分：0)

form_for标记为<form>标记生成所有必需的html，包括操作，方法等。看看生成的源代码，了解“魔术”的作用。您会看到“没有任何反应”，因为您的提交按钮位于另一个<form>块中（在form_for块之外），该块没有设置action属性。并且 - 你明白了 - 没有action导致'不采取行动'。

<强>更新：

为了纠正行为，请加入以下形式：

<%= form_for @page, html: { role: 'form' } do |f| %>
  <div id="error_explanation">
    <h2><%= pluralize(@page.errors.count, "error") %> prohibited this page from being saved </h2>
    <ul>
      <% @page.errors.full_messages.each do |message| %>
        <li><%= message %></li>
      <% end %>
    </ul>
  </div>
  <div class="form-group">
    <%= f.label :title %><br>
    <%= f.text_field :title, :class => 'form-control' %>
  </div>
  <div class="form-group">
    <%= f.label :text %><br>
    <%= f.text_field :text, :class => 'form-control' %>
  </div>
  ...
  <div class="action">
    <%= f.submit 'Save', :class => 'btn btn-default' %>
  </div>
<% end %>
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