使用回形针上传到 Heroku 上的 S3（delayed_job 问题）

Question

我正在尝试上传到我构建的投资组合应用程序，特别是试图找到将 delay_job 挂接到流程中的位置。否则一切正常。现在它返回undefined method 'call' for #<Class:0xae68750>了app/controllers/portfolio_items_controller.rb:18:in 'create'所以这是我的模型和控制器的那部分......有人看到任何可能出错的地方吗？我现在使用的钩子来自这个博客：http : //madeofcode.com/posts/42-paperclip-s3-delayed-job-in-rails

/app/controllers/portfolio_items_controller.rb

def create
  @portfolio_item = PortfolioItem.new(params[:portfolio_item])
  if @portfolio_item.save
    flash[:notice] = "Portfolio item created. As soon as files are uploaded Portfolio item will be made live."
    redirect_to @portfolio_item
  else
    render :action => 'new'
  end
end

/app/models/asset.rb

class Asset < ActiveRecord::Base
  attr_accessible :image, :image_file_name, :image_content_type, :image_file_size, :portfolio_item_id, :order

  belongs_to :portfolio_item

  has_attached_file :image,
    :styles => {
      :thumb => "20x20#",
      :small => "100x100",
      :large => "600x600>"
               },
    :storage => :s3,
    :s3_credentials => {
      :access_key_id => ENV["S3_KEY"],
      :secret_access_key => ENV["S3_SECRET"]
                       },
    :bucket => ENV["S3_BUCKET"],
    :path => "portfolio/:attachment/:id/:style/:basename.:extension"

  before_source_post_process do |image|
    if source_changed?
      processing = true
      false
    end
  end

  after_save do |image|
    if image.source_changed?
      Delayed::Job.enqueue ImageJob.new(image.id)
    end
  end

  def regenerate_styles!
    self.source.reprocess!
    self.processing = false
    self.save(false)
  end

  def source_changed?
    self.source_file_size_changed? ||
    self.source_file_name_changed? ||
    self.source_content_type_changed? ||
    self.source_update_at_changed?
  end
end

class ImageJob < Struct.new(:image_id)
  def perform
    Image.find(self.image_id).regenerate_styles!
  end
end

编辑：感谢善良的人们，它不再是缺少的 .new 了。但现在是 before_source_post_process 没有定义？除了那篇博客文章和这个 SO 问题，我在任何地方都找不到这种方法。有没有更合适的？

Answer 1

before_source_post_process 对你不起作用。它仅适用于：

has_attached_file :source

在你的情况下应该是

before_image_post_process

同样，source_changed? 方法应该是：

def source_changed?
  self.image_file_size_changed? ||
  self.image_file_name_changed? ||
  self.image_content_type_changed? ||
  self.image_update_at_changed?
end