ruby-on-rails - "undefined method ` 模型名称 ' for NilClass:Class"与 CarrierWave

Question

现在我正在使用 CarrierWave 将照片上传到我的网站。问题是，当我打开照片/上传 (upload.html.erb) 时会显示此错误:

undefined method `model_name' for NilClass:Class

在我的 upload.html.erb 的第 1 行附近:

<%= form_for @photos, :html => {:multipart => true} do |f| %>  
  <%= f.error_messages %>  
  <%= f.hidden_field :gallery_id %>  
  <p>  
    <%= f.label :name %><br />  
    <%= f.text_field :name %>  
  </p>  
  <p>  
    <%= f.file_field :photo %>  
  </p>  
  <p><%= f.submit %></p>  
<% end %>  

我不太明白这一点，因为我认为我的模型 (photos.rb) 没有错误:

class Photos < ActiveRecord::Base
  attr_accessor :gallery_id, :name, :photo
  belongs_to :gallery
  mount_uploader :photos, PhotosUploader
end

在我的 photos_controller.rb 我有这个:

class PhotosController < ApplicationController
  def new
    @photos = Photos.new(:gallery_id => params[:gallery_id])
  end

  def create
    @photos = Photos.new(params[:photos])
    if @photos.save
      flash[:notice] = "Successfully created Photos."
    else
      render :action => 'new'
    end
  end

  def edit
    @photos = Photos.find(params[:id])
  end
  def update
    @photos = Photos.find(params[:id])
    if @photos.update_attributes(params[:photos])
      flash[:notice] = "Successfully updated Photos."
    else
      render :action => 'edit'
    end
  end

  def destroy
    @photos = Photos.find(params[:id])
    @photos.destroy
    flash[:notice] = "Successfully destroyed Photos."
  end
end

这是我的 photos_uploader.rb:

class PhotosUploader < CarrierWave::Uploader::Base
  include CarrierWave::RMagick
  storage :file
  def store_dir
    "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  end  
  version :thumb do
    process :scale => [180, 180]
  end
end

问候，伊万

Answer 1

问题可能与您已将上传器安装为 :photos 的事实有关。 ，但表单域是 :photo .尝试进行这些匹配。