Ruby on Rails的：数据不节能的ActiveRecord

本文介绍了Ruby on Rails的：数据不节能的ActiveRecord的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我是pretty的新Ruby on Rails和我一直在试图开发一个简单的博客。然而，当我尝试保存新邮，页面重新加载了新的一页，并没有数据被保存。然而该数据是present中的URI。

下面是我的控制器：

类PostsController＆LT;的ApplicationController  before_action：set_post，只有：[：显示，编辑，：更新：灭] ＃GET /职位 ＃GET /posts.json  高清指数   @posts = Post.all  结束 ＃GET /职位/ 1 ＃GET /posts/1.json 高清节目 结束 ＃GET /职位/新 高清新  @post = Post.new 结束 ＃GET /职位/ 1 /编辑 高清编辑 结束 ＃POST /职位 ＃POST /posts.json DEF创建  @post = Post.new（post_params）  respond_to代码做|格式|    如果@ post.save      的format.html {redirect_to时@post，通知：后已成功创建 }      format.json {渲染：表演，状态：创建，地点：@post}    其他      的format.html {渲染：新}      format.json {渲染JSON：@ post.errors，状态：unprocessable_entity}    结束  结束 结束 ＃PATCH / PUT /职位/ 1 ＃PATCH / PUT /posts/1.json DEF更新   respond_to代码做|格式|     如果@ post.update（post_params）       的format.html {redirect_to时@post，通知：帖子已成功更新 }       format.json {渲染：表演，状态：OK，地点：@post}     其他      的format.html {渲染：编辑}      format.json {渲染JSON：@ post.errors，状态：unprocessable_entity}    结束  结束 结束 ＃删除/职位/ 1 ＃删除/posts/1.json DEF破坏   @ post.destroy   respond_to代码做|格式|     的format.html {redirect_to时posts_url，通知：帖子被成功摧毁 }     format.json {头：} NO_CONTENT   结束 结束 私人   ＃使用回调分享共同的设置或动作之间的约束。   高清set_post     @post = Post.find（PARAMS [：ID]）   结束   ＃从不信任的参数从可怕的网络，只允许白名单通过。   高清post_params     params.require（：岗位）.permit（：标题，：类别：车身）   结束 结束

我修改脚手架生产的形式：

＆LT;形式的作用=形与GT;  ＆LT;％=的form_for（@post）办| F | ％＆GT;    ＆LT;％@如果post.errors.any？ ％＆GT;    ＆LT; D​​IV ID =error_explanation＆GT;      ＆LT; H2＆GT;＆LT;％=复数（@ post.errors.count，错误）％＆GT;禁止这个帖子被保存：＆LT; / H＆GT;      ＆LT; UL＆GT;       ＆LT;％@ post.errors.full_messages.each办|留言| ％＆GT;        ＆LT;李＆GT;＆LT;％=邮件％GT;＆LT; /李＆GT;       ＆LT;％结束％GT;      ＆LT; / UL＆GT;     ＆LT; / DIV＆GT;    ＆LT;％结束％GT;   ＆LT; D​​IV CLASS =形组＆GT;    ＆LT;％= f.label：标题％＆GT;＆LT; BR＆GT;    ＆LT;％= f.text_field：标题，等级：表单控制％＆GT;   ＆LT; / DIV＆GT;   ＆LT; D​​IV CLASS =形组＆GT;    ＆LT;％= f.label：类别％GT;＆LT; BR＆GT;    ＆LT;％= f.select（：类，options_for_select（[编程，评论，书评]）{}，{类：表格控}）％＆GT;   ＆LT; / DIV＆GT;   ＆LT; D​​IV CLASS =形组＆GT;     ＆LT;％= f.label：身体％＆GT;＆LT; BR＆GT;     ＆LT;％= f.text_area：身体类：表单控制，行：50％＆GT;   ＆LT; / DIV＆GT;   ＆LT; D​​IV CLASS =行动＆GT;     ＆LT;％= f.submit（类：BTN BTN-主）％＆GT;   ＆LT; / DIV＆GT;  ＆LT;％结束％GT; ＆LT; /形式GT;

下面是我的模型：

类岗位＆LT;的ActiveRecord :: Base的     验证：标题，presence：真 结束

下面是来自服务器的日志：

入门使用/职位/新？ utf8=%E2%9C%93&authenticity_token=QfJgH82nuYVTEa1vovO4VlIjZmMeJvBLj6bkNKDrz08%3D&post%5Btitle% 5D =你好＆功放;交％5Bcategory％5D =编程和放大器;后期％5Bbody％5D =你好＆放大器;犯=创建+岗位为127.0.0.1，在2014年8月11日11时38分46秒-0400 处理由PostsController＃新的HTML 参数：{UTF8=＆gt;中✓，authenticity_token=＆gt;中QfJgH82nuYVTEa1vovO4VlIjZmMeJvBLj6bkNKDrz08 =，后=＆GT; {标题=＆GT;你好，类别=＆gt;中编程，身体=＆gt;中你好}，提交=＆gt;中创建邮报} 渲染帖子/ _form.html.erb（2.3ms） 渲染帖子/布局内new.html.erb /应用程序（的3.2ms） 完成200 OK的21ms（浏览次数：19.1ms | ActiveRecord的：0.0ms）

解决方案

您的问题是从无效的HTML - 你有一个外部的＆LT;形式GT; 标记，然后内部＆LT;形式GT; 标签（由轨道产生的form_for ）。您的浏览器是继外在形式，它在默认情况下是指令只是通过一个GET请求提交到同一个页面。

您希望您的浏览器遵循内部形式标记，它告诉浏览器提交一个POST请求创建的URL。所以去除外层表格标记。

I'm pretty new to Ruby on Rails and I've been trying to develop a simple blog. However when I try to save the new Post, the page reloads a new page and no data is saved. The data however is present in the URI.

Here's my controller:

class PostsController < ApplicationController before_action :set_post, only: [:show, :edit, :update, :destroy] # GET /posts # GET /posts.json def index @posts = Post.all end # GET /posts/1 # GET /posts/1.json def show end # GET /posts/new def new @post = Post.new end # GET /posts/1/edit def edit end # POST /posts # POST /posts.json def create @post = Post.new(post_params) respond_to do |format| if @post.save format.html { redirect_to @post, notice: 'Post was successfully created.' } format.json { render :show, status: :created, location: @post } else format.html { render :new } format.json { render json: @post.errors, status: :unprocessable_entity } end end end # PATCH/PUT /posts/1 # PATCH/PUT /posts/1.json def update respond_to do |format| if @post.update(post_params) format.html { redirect_to @post, notice: 'Post was successfully updated.' } format.json { render :show, status: :ok, location: @post } else format.html { render :edit } format.json { render json: @post.errors, status: :unprocessable_entity } end end end # DELETE /posts/1 # DELETE /posts/1.json def destroy @post.destroy respond_to do |format| format.html { redirect_to posts_url, notice: 'Post was successfully destroyed.' } format.json { head :no_content } end end private # Use callbacks to share common setup or constraints between actions. def set_post @post = Post.find(params[:id]) end # Never trust parameters from the scary internet, only allow the white list through. def post_params params.require(:post).permit(:title, :category, :body) end end

I modified the form produced by scaffolding:

<form role="form"> <%= form_for(@post) do |f| %> <% if @post.errors.any? %> <div id="error_explanation"> <h2><%= pluralize(@post.errors.count, "error") %> prohibited this post from being saved:</h2> <ul> <% @post.errors.full_messages.each do |message| %> <li><%= message %></li> <% end %> </ul> </div> <% end %> <div class="form-group"> <%= f.label :title %><br> <%= f.text_field :title, class: "form-control" %> </div> <div class="form-group"> <%= f.label :category %><br> <%= f.select(:category, options_for_select(["Programming", "Commentary", "Book Reviews"]), {}, { class: "form-control" })%> </div> <div class="form-group"> <%= f.label :body %><br> <%= f.text_area :body, class: "form-control", rows: "50" %> </div> <div class="actions"> <%= f.submit(class: "btn btn-primary") %> </div> <% end %> </form>

Here's my model:

class Post < ActiveRecord::Base validates :title, presence: true end

Here's the logs from the server:

Started GET "/posts/new? utf8=%E2%9C%93&authenticity_token=QfJgH82nuYVTEa1vovO4VlIjZmMeJvBLj6bkNKDrz08%3D&post%5Btitle% 5D=Hello&post%5Bcategory%5D=Programming&post%5Bbody%5D=Hello&commit=Create+Post" for 127.0.0.1 at 2014-08-11 11:38:46 -0400 Processing by PostsController#new as HTML Parameters: {"utf8"=>"✓", "authenticity_token"=>"QfJgH82nuYVTEa1vovO4VlIjZmMeJvBLj6bkNKDrz08=", "post"=> {"title"=>"Hello", "category"=>"Programming", "body"=>"Hello"}, "commit"=>"Create Post"} Rendered posts/_form.html.erb (2.3ms) Rendered posts/new.html.erb within layouts/application (3.2ms) Completed 200 OK in 21ms (Views: 19.1ms | ActiveRecord: 0.0ms)

解决方案

Your problem is from your invalid HTML - you have an outer <form> tag, and then an inner <form> tag (generated by the Rails form_for). Your browser is following the directive of the outer form, which by default is just to submit to the same page via a GET request.

You want your browser to follow the inner form tag, which is telling the browser to submit a POST request to the create URL. So remove the outer form tag.