ruby-on-rails – Paperclip错误：缺少需要的模型attr_accessor for’avatar_file_name’

然后我想使用Paperclip为每个列表添加照片.我添加了相应的代码到列表show.html.erb,lisTing.rb模型,lisTing_controller.rb和_form.html.erb部分.

当我尝试上传图片给列表我得到这个错误：

Paperclip::Error in LisTingsController#update
LisTing model missing required attr_accessor for 'avatar_file_name'

lisTing_controller的第44行：

def update
 respond_to do |format|
  if @lisTing.update(lisTing_params)
    format.html { redirect_to @lisTing,notice: 'LisTing was successfully updated.' }
    format.json { head :no_content }
  else

需要尝试的几件事情：即将一些代码添加到lisTing.rb模型中,以使可接受的图像为：头像更加健壮.这是几个stackoverflow帖子提到添加到lisTing.rb模型：

validates_attachment_content_type :avatar,:content_type => %w(image/jpeg image/jpg image/png)

不幸的是,当我附加图像时,我仍然会收到相同的错误.当我没有附加图像时,我的默认图像加载正常,并且列表正确创建.

我的房源编号：

class LisTing < ActiveRecord::Base
  has_attached_file :avatar,:styles => { :medium => "150x",:thumb => "100x100>" },:default_url => "default.jpg"
  validates_attachment_content_type :avatar,:content_type => %w(image/jpeg image/jpg image/png) 
end

我的_form.html.erb部分：

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

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

  <div class="form-group">
    <%= f.label :name %><br>
    <%= f.text_field :name,class: "form-control" %>
  </div>
  <div class="form-group">
    <%= f.label :company %><br>
    <%= f.text_field :company,class: "form-control" %>
  </div>
  <div class="form-group">
    <%= f.label :email %><br>
    <%= f.text_field :email,class: "form-control" %>
  </div>
  <div class="form-group">
    <%= f.label :phone %><br>
    <%= f.text_field :phone,class: "form-control" %>
  </div>
  <div class="form-group">
    <%= f.label :avatar %><br>
    <%= f.file_field :avatar,class: "form-control" %>
  </div>
  <div class="form-group">
    <%= f.submit class: "btn btn-priMary" %>
  </div>
<% end %>

我的lisTing_controller.rb控制器：

def update
    respond_to do |format|
      if @lisTing.update(lisTing_params)
        format.html { redirect_to @lisTing,notice: 'LisTing was successfully updated.' }
        format.json { head :no_content }
      else
        format.html { render action: 'edit' }
        format.json { render json: @lisTing.errors,status: :unprocessable_entity }
      end
    end
  end
...
def lisTing_params
   params.require(:lisTing).permit(:name,:company,:email,:phone,:avatar)
end

和我的scheR_229_11845@a.rb文件

ActiveRecord::scheR_229_11845@a.define(version: 20140329174335) do

  create_table "lisTings",force: true do |t|
    t.String   "name"
    t.String   "company"
    t.String   "email"
    t.String   "phone"
    t.datetiR_229_11845@e "created_at"
    t.datetiR_229_11845@e "updated_at"
  end

end

编辑：在运行$rails之后添加控制台输出生成纸夹列出头像

(我需要10个信誉点放在后,所以你必须解决链接http://i.imgur.com/c8KGTa3.png)

rails generate paperclip lisTing avatar

rails destroy paperclip lisTing avatar

rails generate paperclip lisTing avatar

rake db:migrate