博客应用程序在提交表单时未将属性保存到数据库

Posted 2023-03-08

【中文标题】博客应用程序在提交表单时未将属性保存到数据库

【英文标题】：Blog App not saving attributes to database upon form submission

【发布时间】：2019-12-23 15:16:51

【问题描述】：

我正在按照指南使用 Rails 构建博客，简单的 Post 模型带有标题和正文。

我正在使用简单的表单并在提交表单时创建一个新帖子，该帖子保存 created_at 和 updated_at 值，但不保存表单中提交的实际内容。

我尝试删除简单表单的代码并使用 Rails 原生 form_for。这确实将所有值保存到数据库中。我是简单形式的新手，不确定我是否正确使用它。

这是控制台记录：

    Started POST "/posts" for ::1 at 2019-08-17 13:51:01 -0500
    Processing by PostsController#create as html
    Parameters: "utf8"=>"✓",    "authenticity_token"=>"qY8kYZxVIMBL8lzHYuQ4qOu6nXsTGLWCRhLPJ2eiAU8EyzR61fZppAFBYmgcm3rx02FYAHcCgFBVlUyDTLtDGA==", "post"=>"title"=>"Simple Form Test", "body"=>"<p>Test Test Test</p>\r\n", "commit"=>"Create Post"
    (0.0ms)  begin transaction
      SQL (3.3ms)  INSERT INTO "posts" ("created_at", "updated_at") VALUES         (?, ?)  [["created_at", "2019-08-17 18:51:01.325736"], ["updated_at", "2019-        08-17 18:51:01.325736"]]
       (7.7ms)  commit transaction
    Redirected to http://localhost:3000/posts/3
    Completed 302 Found in 28ms (ActiveRecord: 11.1ms)

这是表格：

    <%= simple_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 |msg| %>
      <li>
        <%= msg %>
      </li>
              <% end %>
          </ul>
        </div>
      <% end %>
      <div class="form-group">
          <%= f.input :title, class: "form-control" %>
      </div>

      <div class="form-group">
        <%= f.input :body, :as => :ckeditor, input_html: :ckeditor =>         :toolbar => 'FULL', class: "form-control" %>
      </div>

      <div class="form-group">
        <%= f.button :submit %>
      </div>
    <% end %>

这里是控制器：

class PostsController < ApplicationController
  before_action :find_post, only: [:edit, :update, :show, :delete]

  # Index action to render all posts
  def index
    @posts = Post.all
  end

  # New action for creating post
  def new
    @post = Post.new
  end

  # Create action saves the post into database
  def create
    @post = Post.new
    if @post.save(post_params)
      flash[:notice] = "Successfully created post!"
      redirect_to post_path(@post)
    else
      flash[:alert] = "Error creating new post!"
      render :new
    end
  end

  # Edit action retrives the post and renders the edit page
  def edit
  end

  # Update action updates the post with the new information
  def update
    if @post.update_attributes(post_params)
      flash[:notice] = "Successfully updated post!"
      redirect_to post_path(@post)
    else
      flash[:alert] = "Error updating post!"
      render :edit
    end
  end

  # The show action renders the individual post after retrieving the the id
  def show
  end

  # The destroy action removes the post permanently from the database
  def destroy
    if @post.destroy
      flash[:notice] = "Successfully deleted post!"
      redirect_to posts_path
    else
      flash[:alert] = "Error updating post!"
    end
  end

  private

  def post_params
    params.require(:post).permit(:title, :body)
  end

  def find_post
    @post = Post.find(params[:id])
  end
end
Hopin

g 能够创建带有正文和标题的帖子，并了解有关简单表单的更多信息。

提前致谢！

【问题讨论】：

我们要猜测你控制器中的代码吗？

对不起，我知道我忘记了什么！现已添加

【参考方案1】：

你写了@post = Post.new 没有将参数传递给你的对象，所以当你保存你的对象时，你保存了一个空对象。

应该是：

@post = Post.new(post_params)

或者直接

@post = Post.create(post_params)