ruby-on-rails – Rails4 – 如何在没有裁剪的情况下压缩用户在R

我在uploaders文件夹下有这个文件,它将图像附加到使用redactor gem制作的帖子上.

redactor_rails_picture_uploader.rb

# encoding: utf-8
class RedactorRailsPictureUploader < CarrierWave::Uploader::Base
  include RedactorRails::Backend::CarrierWave

  # Include RMagick or ImageScience support:
  # include CarrierWave::RMagick
  include CarrierWave::MiniMagick
  # include CarrierWave::ImageScience

  # Choose what kind of storage to use for this uploader:
  storage :fog

  # Override the directory where uploaded files will be stored.
  # This is a sensible default for uploaders that are meant to be mounted:
  def store_dir
    "system/redactor_assets/pictures/#{model.id}"
  end

  # Provide a default URL as a default if there hasn't been a file uploaded:
  # def default_url
  #   "/images/fallback/" + [version_name,"default.png"].compact.join('_')
  # end

  # Process files as they are uploaded:
  # process :scale => [200,300]
  #
  # def scale(width,height)
  #   # do something
  # end

  process :read_dimensions

  # Create different versions of your uploaded files:
  # version :thumb do
  #   process :resize_to_fill => [118,100]
  # end

  # version :content do
  #   process :resize_to_limit => [800,800]
  # end

  # Add a white list of extensions which are allowed to be uploaded.
  # For images you might use something like this:
  def extension_white_list
    RedactorRails.image_file_types
  end

  # Override the filename of the uploaded files:
  # Avoid using model.id or version_name here,see uploader/store.rb for details.
  # def filename
  #   "something.jpg" if original_filename
  # end
end

我不想限制用户上传低于10或8 MB的图像.
我也不想裁剪图像.
我想在我的rails应用程序中将图像压缩到小于10或8 MB,而不是打扰用户裁剪或压缩图像.

我有宝石,如carrierwave,mini_magick,它们都有效.
这是我的宝石文件.

source 'https://rubygems.org'
ruby   '2.1.4'

gem 'bootstrap-sass','~> 3.3.1'
gem 'autoprefixer-rails'

gem 'rails','4.2.0.beta2'
gem 'bcrypt','3.1.7'
gem 'faker','1.4.2'
gem 'carrierwave','0.10.0'
gem 'mini_magick','3.8.0'
gem 'paperclip'
gem 'aws-sdk'
gem 'fog','1.23.0'
gem 'will_paginate','3.0.7'
gem 'bootstrap-will_paginate','0.0.10'

gem 'mailboxer'
gem 'rack-reverse-proxy',:require => 'rack/reverse_proxy'

gem 'chosen-rails'
gem 'jquery-turbolinks'

gem 'masonry-rails','~> 0.2.4'

gem 'newrelic_rpm'

gem 'rocket_pants','~> 1.10.0'

gem "recaptcha",:require => "recaptcha/rails"

gem 'metamagic'

gem 'redactor-rails'

gem 'fitvidsjs_rails'

gem 'pusher'

gem 'sass-rails','~> 5.0.0.beta1'

gem 'uglifier','>= 1.3.0'

gem 'coffee-rails','~> 4.0.0'
gem 'jquery-rails','~> 4.0.0.beta2'
gem 'jbuilder','~> 2.0'
gem 'sdoc','~> 0.4.0',group: :doc


group :development,:test do

  gem 'byebug'

  gem 'web-console','~> 2.0.0.beta4'

  gem 'spring'

  gem 'sqlite3'  
end

group :production do
  gem 'pg','0.17.1'
  gem 'rails_12factor','0.0.2'
  gem 'unicorn'
end

carrier_wave.rb

if Rails.env.production?
  CarrierWave.configure do |config|
    config.fog_credentials = {
      # Configuration for Amazon S3
      :provider              => 'AWS',:aws_access_key_id     => ENV['S3_ACCESS_KEY'],:aws_secret_access_key => ENV['S3_SECRET_KEY'],:region                => ENV['S3_REGION'],:path_style            => true
    }
    config.fog_directory     =  ENV['S3_BUCKET']
  end
end

谁能分享如何做到这一点？
请帮助.谢谢.