如何在载波中重新处理图像版本？

Question

我正在尝试编写一个 rake 任务，它应该在我更改上传文件中的版本参数后重新处理我所有上传的图像版本。

我希望能够从 bash 或 rails 控制台调用它。出于这个原因，我为相关模型 diapo.rb 编写了一个 rake 任务和一个方法 reprocess，我可以在 rake 任务中调用它。（我按照这个回答）

目前我有一个资源模型Diapo.rb

class Diapo < ActiveRecord::Base

  mount_uploader :file_name, DiapoUploader

  def reprocess
    begin
      self.cache_stored_file!
      self.retrieve_from_cache!(self.cache_name)
      self.recreate_versions!
      self.save!
    rescue => e
      STDERR.puts  "ERROR: MyModel: #{id} -> #{e.to_s}"
    end
  end
end

在我的上传文件中我指定了一系列版本diapo_uploader.rb

class DiapoUploader < CarrierWave::Uploader::Base

  include CarrierWave::MiniMagick
  include CarrierWave::MimeTypes

  process :set_content_type

  storage :file

  def store_dir
    "uploads/#{model.class.to_s.downcase.pluralize}/#{mounted_as}/#{model.id}"
  end

  version :diapo0500, :if => :diapo? do
    process :resize_to_fit => [500, 500]
    process :quality => 50
  end

  version :thumb, :if => :diapo? do
    process :resize_to_fit => [200, 200]
    process :quality => 50
  end
end

我写了一个rake任务：carrierwave.rake

# CarrierWave rake tasks
#
# Task:   reprocess
# Desc:   Reprocess all diapos
# Usage:  rake carrierwave:reprocess_diapo

namespace :carrierwave do
  task :reprocess_diapo => :environment do
    Diapo.all.each do |d|
      d.reprocess
    end
  end
end

目前我得到：

$ rake carrierwave:reprocess_diapo
ERROR: MyModel: 1 -> undefined method `cache_stored_file!' for #<Diapo:0x111cd8428>
ERROR: MyModel: 2 -> undefined method `cache_stored_file!' for #<Diapo:0x111c98300>
ERROR: MyModel: 3 -> undefined method `cache_stored_file!' for #<Diapo:0x111c97db0>
ERROR: MyModel: 4 -> undefined method `cache_stored_file!' for #<Diapo:0x111c97798>
ERROR: MyModel: 5 -> undefined method `cache_stored_file!' for #<Diapo:0x111c97108>
ERROR: MyModel: 6 -> undefined method `cache_stored_file!' for #<Diapo:0x111c96af0>

Rails 是 3.2.5 载波为0.11.1

我做错了什么？

提前致谢！

更新

感谢@Abhishek，我通过添加相关属性更新了我的模型Diapo.rb：

class Diapo < ActiveRecord::Base

  mount_uploader :file_name, DiapoUploader

  def reprocess
    begin
      self.file_name.cache_stored_file!
      self.file_name.retrieve_from_cache!(self.file_name.cache_name)
      self.file_name.recreate_versions!
      self.save!
    rescue => e
      STDERR.puts  "ERROR: MyModel: #{id} -> #{e.to_s}"
    end
  end
end

这次我得到以下错误：

$ rake carrierwave:reprocess_diapo
ERROR: MyModel: 1 -> uninitialized constant MimeMagic::Encoding
...

初始上传顺利。只有预处理会引发此错误。

Answer 1

recreate_versions! 方法适用于模型中相应的 attribute。

在你的情况下，它应该是这样的：

class Diapo < ActiveRecord::Base

  mount_uploader :file_name, DiapoUploader

  def reprocess
    file_name.recreate_versions!
  end
end

如何在载波中重新处理图像版本？

How to reprocess image versions in carrierwave?

ruby-on-rails

ruby-on-rails-3

carrierwave