Question

我在rails项目中遇到了一个很棒的错误。我有一个控制器＆＃34; article.rb＆＃34;。我使用回形针来附加多个图像，为此我使用了一个模型＆＃34; article_image＆＃34;。当我采取行动新建一篇新文章并检查新记录时，每件事情都可以。我收到以下错误：

未定义的方法`new_record？＆＃39;为零：NilClass

articles_controller.rb

    class ArticlesController < ApplicationController

    before_action :confirm_logged_in
    def index
        @articles= Article.paginate(page: params[:page],per_page:15).sorted

    end

    def new
        @articles=Article.new()
        3.times {@articles.article_images.build}
    end

    def create
        @articles= Article.new(article_params)
        if @articles.save
            flash[:notice]="article created successfully"
            redirect_to(:action =>"index")
        else 
            render("new")
        end
    end

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

    def edit
        @articles= Article.find(params[:id])
        4.times {@articles.article_images.build}
    end

    def update
        @articles=Article.find(params[:id])
        if @articles.update_attributes(article_params)
            flash[:notice]="Article updated successfully"
            redirect_to(:action=>"show",:id=>@articles.id)
        else
            render("edit")
        end
    end

    def delete
        @articles= Article.find(params[:id])
    end

    def destroy
        @articles=Article.find(params[:id])
        @articles.destroy
        redirect_to(:action => 'index')
    end

    private
    def article_params
        params.require(:articles).permit(:title,:position,:visible,:body,:created_at, article_imgs_attributes: [:photo])
    end
end

模型/ article.rb

类文章＆lt;的ActiveRecord ::基

    has_many :article_images, :dependent => :destroy
    accepts_nested_attributes_for :article_images
    belongs_to :admin_user   
   end

模型/ article_image.rb

    class ArticleImage < ActiveRecord::Base
    belongs_to :article
    has_attached_file :photo, :styles => {:medium => "300x300>", :thumb => "100x100#"}
    validates_attachment_presence :photo
    validates_attachment_size :photo, :less_than => 5.megabytes
    validates_attachment_content_type :photo, :content_type => /\Aimage\/.*\Z/
end

查看/条/新/ html.erb

    <div class="page-header"><h1>Articles</h1></div>
<%= link_to("back to article",{:action =>"index"}, :class =>"action index") %>

<%= form_for(:articles, :html =>{:multipart => true}, :url=>{:action =>'create'}) do |f| %> 
    <%= f.fields_for :article_imgs do |builder| %>
        <% if builder.object.new_record? %>
        <p>
          <%= builder.label :photo, "Image File" %>
          <%= builder.file_field :photo %>
        </p>

        <% end %> 
      <% end %>
  <% end %>


 <div class="form-submit">
    <%= submit_tag("create article") %>
 </div>
 <% end %>
</div>

中出错

>    <% if builder.object.new_record? %>

我使用＆＃39; paperclip＆＃39;，＆＃39;〜＆gt; 4.2.1＆＃39;在这个项目中。任何人都可以帮我找到问题吗？

Answer 1

articles_controller.rb中的更改

def article_params
   params.require(:articles).permit(:title,:position,:visible,:body,:created_at, article_images_attributes: [:photo])
end

并在views / article / new / html.erb

中

<%= f.fields_for :article_images do |builder| %>

我希望它有效

Paperclip：未定义的方法`new_record？＆＃39;为零：NilClass

1 个答案: