Question

如果编辑和更改值，代码工作正常，但如果我更新相同的值，则会创建新记录。

我只是关注ruby教程，并坚持这个问题。我对ruby和rails很新。

Controller：articles_controller.rb

class ArticlesController < ApplicationController

def create
    #render plain: params[:article].inspect
    @article = Article.new(article_params)

    if @article.save
        redirect_to @article
    else
        render 'new'
    end
end

def new
    @article = Article.new
end

def show
    @article = Article.find(params[:id])
end

def index
    @articles = Article.all    
end

def edit
    @article = Article.find(params[:id])
end

def update
    @article = Article.find(params[:id])

    if @article.update(article_params)
        redirect_to @article
    else
        render 'edit'
    end
end


private
  def article_params
    params.require(:article).permit(:title_article, :text_article, :author_article)
  end

end

表格：_form.html.erb

<% if @article.errors.any? %>
    <div id="error_explanation">
      <h2>
        <%= pluralize(@article.errors.count, "error") %> prohibited
        this article from being saved:
      </h2>
      <ul>
        <% @article.errors.full_messages.each do |msg| %>
          <li><%= msg %></li>
        <% end %>
      </ul>
    </div>
<% end %>

<p>
    <%= f.label :title_article ,"Title" %><br>
    <%= f.text_field :title_article %>
</p>

<p>
    <%= f.label :text_article ,"Content" %><br>
    <%= f.text_area :text_article %>
</p>

<p>
    <%= f.label :author_article ,"Author" %><br>
    <%= f.text_field :author_article %>
</p>

<p>
    <%= f.submit "Submit" %>
</p>
<% end %>

新文章页面：new.html.erb

<h1>Edit Page</h1>

<%= render 'form' %>

<%= link_to 'Back', articles_path %>

修改文章页面：edit.html.erb

<h1>New Page</h1>

<%= render 'form' %>

<%= link_to 'Back', articles_path %>

Answer 1

正如@Cyril DD在评论中所说，_form.html.erb中的代码在第一行应该有<%= form_for(@article) do |f| %>。（我想它应该引发语法错误......）

_form.html.erb

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

我复制了所有代码并添加了该行。然后，一切正常。即使在编辑中没有更改任何值，它也没有制作新文章。

如果未修改值，则更新创建新记录

1 个答案: