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，该任务应该在更改上传器文件中的版本参数后重新处理我上传的所有图像版本。

我希望能够从 bash 或 rails 控制台调用它。出于这个原因，我为相对模型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 https://stackoverflow.com/a/31220535 遵循了这个答案(

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

在我的上传器文件中，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

我写了一个耙子任务：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>

导轨是 3.2.5 载波为 0.11.1

我做错了什么？

提前谢谢你！

更新

多亏了@Abhishek我通过添加相对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

这次我收到以下错误：

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

初始上传进展顺利。只有预处理会引发此错误。

Answer 1

recreate_versions!方法适用于模型中的相应attribute。

在您的情况下，它应该是这样的：

class Diapo < ActiveRecord::Base
mount_uploader :file_name, DiapoUploader
def reprocess
file_name.recreate_versions!
end
end