http://noodles-mtb.hatenablog.com/entry/2013/07/08/151316

API

http://rubydoc.info/github/jnicklas/carrierwave/CarrierWave/RMagick:resize_to_fill

widthだけ調整したい場合

http://stackoverflow.com/questions/7194421/rails-3-0-carrierwave-and-resize-to-a-specific-width http://stackoverflow.com/questions/8570181/carrierwave-resizing-images-to-fixed-width

process :resize_to_limit => [500, 0]

image recreate

https://github.com/carrierwaveuploader/carrierwave/wiki/How-to%3A-Recreate-and-reprocess-your-files-stored-on-fog

YourModel.all.each do |ym|
  begin
    ym.process_your_uploader_upload = true # only if you use carrierwave_backgrounder
    ym.your_uploader.cache_stored_file!
    ym.your_uploader.retrieve_from_cache!(ym.your_uploader.cache_name)
    ym.your_uploader.recreate_versions!
    ym.save!
  rescue => e
    puts  "ERROR: YourModel: #{ym.id} -> #{e.to_s}"
  end
end

urlでimage(file)保存

remote_[column_name]_urlを利用

version & version filename

https://github.com/carrierwaveuploader/carrierwave/wiki/How-to%3A-Customize-your-version-file-names

class LogoUploader < CarrierWave::Uploader::Base
  # ...
  def filename
    "original.#{model.logo.file.extension}" if original_filename
  end
  version :small do
    process :resize_to_fit => [190, 190]
    process :convert => 'png'
  end
  version :icon do
    process :resize_to_fill => [50, 50]
    process :convert => 'png'
  end
  # ...
end

original_small.png or original_icon.png

もし、直接ファイル名を指定した場合には

def filename
  "original.#{model.logo.file.extension}" if original_filename
end
version :small do
  process :resize_to_limit => [190,190]
  process :convert => 'png'
  def full_filename (for_file = model.logo.file)
    "small.png"
  end
end
version :icon do
  process :resize_to_fill => [50,50]
  process :convert => 'png'
  def full_filename (for_file = model.logo.file)
    "icon.png"
  end
end

fog

使える変数

• modelがモデル。ここでははphoto
• mounted_asがカラム。ここではimage

References

• Railsでcarrierwaveを使ってAWS S3に画像をアップロードする手順を画像付きで説明する