rails4 + mongoid +載波+ fog + jquery-file-upload-TypeError（沒有將nil隱式轉換為String）

Question

我無法弄清楚在多文件上傳中我在做什么錯。 我有另一個具有類似設置的rails4應用程序，只是使用了postgresql而不是mongoid，而我還沒有遇到這個問題。 我不確定這是與載波波狀雜音有關的還是什么。 我如何進一步縮小真正導致TypeError的原因？？？

更新重新創建了整個應用程序，並使用了Postgresql，並遇到了完全相同的問題..因此，它沒有像我想的那樣被隔離到載波-雜種動物中。

Development.log

       Started POST "/images" for 127.0.0.1 at 2014-10-02 11:28:28 -0400
Processing by ImagesController#create as JSON
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"MPtXrjrQ+dLb67LVD+aYUrMIYfCUBQWLOaOztlB2sSU=", "image"=>{"gallery_id"=>"3", "file"=>[#<ActionDispatch::Http::UploadedFile:0x007fb55e80c378 @tempfile=#<Tempfile:/var/folders/3m/t1v11gzj32n0fdbhwr823y600000gn/T/RackMultipart20141002-33694-3bmoib>, @original_filename="10495567_1510476362523625_7774203923998269219_o.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"image[file][]\"; filename=\"10495567_1510476362523625_7774203923998269219_o.jpg\"\r\nContent-Type: image/jpeg\r\n">]}}
Completed 500 Internal Server Error in 3ms

TypeError (no implicit conversion of nil into String):
  carrierwave (0.10.0) lib/carrierwave/uploader/cache.rb:159:in `join'
  carrierwave (0.10.0) lib/carrierwave/uploader/cache.rb:159:in `cache_path'
  carrierwave (0.10.0) lib/carrierwave/uploader/cache.rb:131:in `block in cache!'
  carrierwave (0.10.0) lib/carrierwave/uploader/callbacks.rb:17:in `with_callbacks'
  carrierwave (0.10.0) lib/carrierwave/uploader/cache.rb:122:in `cache!'
  carrierwave (0.10.0) lib/carrierwave/mount.rb:329:in `cache'
  carrierwave (0.10.0) lib/carrierwave/mount.rb:163:in `file='
  carrierwave (0.10.0) lib/carrierwave/orm/activerecord.rb:39:in `file='
  activerecord (4.1.5) lib/active_record/attribute_assignment.rb:45:in `public_send'
  activerecord (4.1.5) lib/active_record/attribute_assignment.rb:45:in `_assign_attribute'
  activerecord (4.1.5) lib/active_record/attribute_assignment.rb:32:in `block in assign_attributes'
  activerecord (4.1.5) lib/active_record/attribute_assignment.rb:26:in `each'
  activerecord (4.1.5) lib/active_record/attribute_assignment.rb:26:in `assign_attributes'
  activerecord (4.1.5) lib/active_record/core.rb:455:in `init_attributes'
  activerecord (4.1.5) lib/active_record/core.rb:198:in `initialize'
  activerecord (4.1.5) lib/active_record/inheritance.rb:30:in `new'
  activerecord (4.1.5) lib/active_record/inheritance.rb:30:in `new'
  cancancan (1.9.2) lib/cancan/controller_resource.rb:85:in `build_resource'
  cancancan (1.9.2) lib/cancan/controller_resource.rb:66:in `load_resource_instance'
  cancancan (1.9.2) lib/cancan/controller_resource.rb:32:in `load_resource'
  cancancan (1.9.2) lib/cancan/controller_resource.rb:25:in `load_and_authorize_resource'
  cancancan (1.9.2) lib/cancan/controller_resource.rb:10:in `block in add_before_filter'
  activesupport (4.1.5) lib/active_support/callbacks.rb:440:in `instance_exec'
  activesupport (4.1.5) lib/active_support/callbacks.rb:440:in `block in make_lambda'
  activesupport (4.1.5) lib/active_support/callbacks.rb:160:in `call'
  activesupport (4.1.5) lib/active_support/callbacks.rb:160:in `block in halting'
  activesupport (4.1.5) lib/active_support/callbacks.rb:229:in `call'
  activesupport (4.1.5) lib/active_support/callbacks.rb:229:in `block in halting'
  activesupport (4.1.5) lib/active_support/callbacks.rb:229:in `call'
  activesupport (4.1.5) lib/active_support/callbacks.rb:229:in `block in halting'
  activesupport (4.1.5) lib/active_support/callbacks.rb:166:in `call'
  activesupport (4.1.5) lib/active_support/callbacks.rb:166:in `block in halting'
  activesupport (4.1.5) lib/active_support/callbacks.rb:166:in `call'
  activesupport (4.1.5) lib/active_support/callbacks.rb:166:in `block in halting'
  activesupport (4.1.5) lib/active_support/callbacks.rb:166:in `call'
  activesupport (4.1.5) lib/active_support/callbacks.rb:166:in `block in halting'
  activesupport (4.1.5) lib/active_support/callbacks.rb:86:in `call'
  activesupport (4.1.5) lib/active_support/callbacks.rb:86:in `run_callbacks'
  actionpack (4.1.5) lib/abstract_controller/callbacks.rb:19:in `process_action'
  actionpack (4.1.5) lib/action_controller/metal/rescue.rb:29:in `process_action'
  actionpack (4.1.5) lib/action_controller/metal/instrumentation.rb:31:in `block in process_action'
  activesupport (4.1.5) lib/active_support/notifications.rb:159:in `block in instrument'
  activesupport (4.1.5) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
  activesupport (4.1.5) lib/active_support/notifications.rb:159:in `instrument'
  actionpack (4.1.5) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
  actionpack (4.1.5) lib/action_controller/metal/params_wrapper.rb:250:in `process_action'
  activerecord (4.1.5) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
  actionpack (4.1.5) lib/abstract_controller/base.rb:136:in `process'
  actionview (4.1.5) lib/action_view/rendering.rb:30:in `process'
  actionpack (4.1.5) lib/action_controller/metal.rb:196:in `dispatch'
  actionpack (4.1.5) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
  actionpack (4.1.5) lib/action_controller/metal.rb:232:in `block in action'
  actionpack (4.1.5) lib/action_dispatch/routing/route_set.rb:82:in `call'
  actionpack (4.1.5) lib/action_dispatch/routing/route_set.rb:82:in `dispatch'
  actionpack (4.1.5) lib/action_dispatch/routing/route_set.rb:50:in `call'
  actionpack (4.1.5) lib/action_dispatch/journey/router.rb:71:in `block in call'
  actionpack (4.1.5) lib/action_dispatch/journey/router.rb:59:in `each'
  actionpack (4.1.5) lib/action_dispatch/journey/router.rb:59:in `call'
  actionpack (4.1.5) lib/action_dispatch/routing/route_set.rb:678:in `call'
  warden (1.2.3) lib/warden/manager.rb:35:in `block in call'
  warden (1.2.3) lib/warden/manager.rb:34:in `catch'
  warden (1.2.3) lib/warden/manager.rb:34:in `call'
  rack (1.5.2) lib/rack/etag.rb:23:in `call'
  rack (1.5.2) lib/rack/conditionalget.rb:35:in `call'
  rack (1.5.2) lib/rack/head.rb:11:in `call'
  actionpack (4.1.5) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
  actionpack (4.1.5) lib/action_dispatch/middleware/flash.rb:254:in `call'
  rack (1.5.2) lib/rack/session/abstract/id.rb:225:in `context'
  rack (1.5.2) lib/rack/session/abstract/id.rb:220:in `call'
  actionpack (4.1.5) lib/action_dispatch/middleware/cookies.rb:560:in `call'
  activerecord (4.1.5) lib/active_record/query_cache.rb:36:in `call'
  activerecord (4.1.5) lib/active_record/connection_adapters/abstract/connection_pool.rb:621:in `call'
  activerecord (4.1.5) lib/active_record/migration.rb:380:in `call'
  actionpack (4.1.5) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
  activesupport (4.1.5) lib/active_support/callbacks.rb:82:in `run_callbacks'
  actionpack (4.1.5) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
  actionpack (4.1.5) lib/action_dispatch/middleware/reloader.rb:73:in `call'
  actionpack (4.1.5) lib/action_dispatch/middleware/remote_ip.rb:76:in `call'
  actionpack (4.1.5) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
  actionpack (4.1.5) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
  railties (4.1.5) lib/rails/rack/logger.rb:38:in `call_app'
  railties (4.1.5) lib/rails/rack/logger.rb:20:in `block in call'
  activesupport (4.1.5) lib/active_support/tagged_logging.rb:68:in `block in tagged'
  activesupport (4.1.5) lib/active_support/tagged_logging.rb:26:in `tagged'
  activesupport (4.1.5) lib/active_support/tagged_logging.rb:68:in `tagged'
  railties (4.1.5) lib/rails/rack/logger.rb:20:in `call'
  actionpack (4.1.5) lib/action_dispatch/middleware/request_id.rb:21:in `call'
  rack (1.5.2) lib/rack/methodoverride.rb:21:in `call'
  rack (1.5.2) lib/rack/runtime.rb:17:in `call'
  activesupport (4.1.5) lib/active_support/cache/strategy/local_cache_middleware.rb:26:in `call'
  rack (1.5.2) lib/rack/lock.rb:17:in `call'
  actionpack (4.1.5) lib/action_dispatch/middleware/static.rb:64:in `call'
  rack (1.5.2) lib/rack/sendfile.rb:112:in `call'
  railties (4.1.5) lib/rails/engine.rb:514:in `call'
  railties (4.1.5) lib/rails/application.rb:144:in `call'
  /Users/joel/Library/Application Support/Pow/Versions/0.4.3/node_modules/nack/lib/nack/server.rb:155:in `handle'
  /Users/joel/Library/Application Support/Pow/Versions/0.4.3/node_modules/nack/lib/nack/server.rb:109:in `rescue in block (2 levels) in start'
  /Users/joel/Library/Application Support/Pow/Versions/0.4.3/node_modules/nack/lib/nack/server.rb:106:in `block (2 levels) in start'
  /Users/joel/Library/Application Support/Pow/Versions/0.4.3/node_modules/nack/lib/nack/server.rb:96:in `each'
  /Users/joel/Library/Application Support/Pow/Versions/0.4.3/node_modules/nack/lib/nack/server.rb:96:in `block in start'
  /Users/joel/Library/Application Support/Pow/Versions/0.4.3/node_modules/nack/lib/nack/server.rb:76:in `loop'
  /Users/joel/Library/Application Support/Pow/Versions/0.4.3/node_modules/nack/lib/nack/server.rb:76:in `start'
  /Users/joel/Library/Application Support/Pow/Versions/0.4.3/node_modules/nack/lib/nack/server.rb:12:in `run'
  /Users/joel/Library/Application Support/Pow/Versions/0.4.3/node_modules/nack/bin/nack_worker:4:in `<main>'


  Rendered /usr/local/rvm/gems/ruby-2.1.2/gems/actionpack-4.1.5/lib/action_dispatch/middleware/templates/rescues/_source.erb (0.5ms)
  Rendered /usr/local/rvm/gems/ruby-2.1.2/gems/actionpack-4.1.5/lib/action_dispatch/middleware/templates/rescues/_trace.text.erb (0.5ms)
  Rendered /usr/local/rvm/gems/ruby-2.1.2/gems/actionpack-4.1.5/lib/action_dispatch/middleware/templates/rescues/_request_and_response.text.erb (0.9ms)
  Rendered /usr/local/rvm/gems/ruby-2.1.2/gems/actionpack-4.1.5/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb (16.2ms)

模型

class Picture
  include Mongoid::Document
  include Mongoid::Timestamps

  belongs_to :gallery

  mount_uploader :file, PictureUploader

  def to_jq_upload
    {
      "name" => read_attribute(:file),
      "size" => file.size,
      "url" => file.url,
      "thumb_url" => file.thumb.url,
      #"delete_url" => gallery_picture_path(:id => id),
      "delete_type" => "DELETE" 
    }
  end
end

調節器

class PicturesController < ApplicationController
  load_and_authorize_resource

  before_action :set_picture, only: [:destroy]

  def create
    p_attr = params[:picture]
    p_attr[:file] = params[:picture][:file].first if params[:picture][:file].class == Array

    logger.debug "params = #{params}"
    logger.debug "p_attr = #{p_attr}"

    @picture = Picture.new(p_attr)

    if @picture.save
      respond_to do |format|
        format.js
        format.html {  
          render :json => [@picture.to_jq_upload].to_json, 
          :content_type => 'text/html',
          :layout => false
        }
        format.json {  
          render :json => { :files => [@picture.to_jq_upload] }     
        }
      end
    else 
      render :json => [{:error => "custom_failure"}], :status => 304
    end
  end

  private

  def picture_params
      params.require(:picture).permit(:gallery_id, file:[])
  end

形成

    <%= form_for Picture.new, :html => { :multipart => true, :id => "fileupload" } do |fm| %>
            <%= fm.file_field :file, :id => "add_images_field", :multiple => true %>
    <% end %>

的Gemfile

gem 'rails', '4.1.5'
gem 'mongoid', '~> 4.0.0'
gem 'bson_ext'
gem 'carrierwave-mongoid', :require => 'carrierwave/mongoid'
gem 'mini_magick'
gem 'fog'
gem "jquery-fileupload-rails"

Answer 1

快速瀏覽一下，我會說您設置的picture_params錯誤； 至少基於POST提交字符串。 “文件”嵌套在“圖像”下，它不在哈希的根目錄下。

Rails 4-強參數-嵌套對象

這是您的POST字符串的一些可視格式：

{
"utf8"=>"✓"
"authenticity_token"=>"MPtXrjrQ+dLb67LVD+aYUrMIYfCUBQWLOaOztlB2sSU="
"image"=>{
    "gallery_id"=>"3"
    "file"=>[#<ActionDispatch::Http::UploadedFile:0x007fb55e80c378 @tempfile=#<Tempfile:/var/folders/3m/t1v11gzj32n0fdbhwr823y600000gn/T/RackMultipart20141002-33694-3bmoib>
        @original_filename="10495567_1510476362523625_7774203923998269219_o.jpg"
        @content_type="image/jpeg"
        @headers="Content-Disposition: form-data; name=\"image[file][]\"; filename=\"10495567_1510476362523625_7774203923998269219_o.jpg\"\r\nContent-Type: image/jpeg\r\n">]
}
}

因此，您需要的是：

params.require(:picture).permit(:image => [:gallery_id, file: []])

但是，由於您的表單提交哈希與模型名稱不匹配-出於任何原因，請嘗試：

params.require(:image).permit(:gallery_id, file: [])

編輯：我也很好奇為什么您要在image嵌套file和gallery_id屬性。 這將改變Rails將參數分配給模型的方式，這也許就是為什么您得到零的原因。 我認為真正的問題是您建立表格的方式。 查看您的routes.rb文件； URL以/images結尾，但是您的模型是Picture 。 看來您在命名方面有沖突-可能在代碼的多個區域中。

Answer 2

@JakeTheSnake可能在某些地方。 在更具體的層面上，我根據您的回溯來快速瀏覽了一下自己。

在GitHub的第159行中查看源代碼，這是backtrace的前兩行引用的行：

carrierwave (0.10.0) lib/carrierwave/uploader/cache.rb:159:in `join'
carrierwave (0.10.0) lib/carrierwave/uploader/cache.rb:159:in `cache_path'

這里是鹽粒，因為我對Carrierwave一無所知，而且很少有信息可做。 但是，我在0.10.0載波文檔中搜索了方法“ cache_path”，卻一無所獲。 注意，回溯的第一行引用File.join中的“ join”。 我的猜測是，該File.join中的三個調用之一， cache_name ， cache_path或最后一個root都返回nil。 File.join試圖將此nil轉換為String ，這在Ruby中不會發生。

我知道這個答案並不像它可能的那么技術性，而且還不能直接解決問題。 我只希望它至少可以為您指明正確的方向或以某種方式提供幫助。

請讓我知道是否可以提供更多幫助。 祝好運。

編輯：可能在任何地方，我從調查回溯引用的更多代碼中汲取了靈感，使我相信@JakeTheSnake確實存在於其中。 我認為當他說這是一個高級問題（例如配置錯誤的表單或控制器，有些小的東西）時，他可能是對的，但是，深入分析您的回溯和背后的代碼是非常有用的，並且會產生很多難題。 如果您還沒有的話，我將認真回顧一下回溯中引用的代碼。 再次祝您好運，請告訴我是否可以提供更多幫助。

Answer 3

這是我的解決方案：
模型：

class Picture < ActiveRecord::Base
  include Rails.application.routes.url_helpers
  mount_uploader :image, SimpleImageUploader

  def to_jq_upload
  {
    "name" => read_attribute(:image),
    "size" => image.size,
    "url" => image.url,
    "thumbnail_url" => image.thumb.url,
    "delete_url" => picture_path(:id => id),
    "delete_type" => "DELETE"
  }
  end
end

行動：

  def create
    pics = picture_params
    @picture = Picture.new(image: pics[:image].first)
    if @picture.save
       ...
    end
  end
  ...
  private
  def picture_params
    params.require(:picture).permit(image: [])
  end

簡短查看：

<%= form_for Picture.new, :html => {:multipart => true, :id => "fileupload"} do |f| %>
  <%= f.file_field :image, multiple: true, accept: 'image/*' %>
  ..
<% end %>