利用carrierwave&amazon s3來上傳檔案

必須的gem

gem 'carrierwave'
gem 'mini_magick'
gem 'fog'

AWS設定可以參考這裡

生成的uploader裡本來有一段storage :file 把它改成下面這樣,讓他在production的時候是把圖傳到s3去

 if Rails.env.production?
    storage :fog
  else
    storage :file
  end

新增 config/initializers/carrier_wave.rb

if Rails.env.production?
  CarrierWave.configure do |config|
    config.fog_credentials = {

      provider:               'AWS',
      region:                 'ap-northeast-1'
      aws_access_key_id:      ENV['S3_ACCESS_KEY'],
      aws_secret_access_key:  ENV['S3_SECRET_KEY']
    }
    config.fog_directory     =  ENV['S3_BUCKET']
  end

region查詢