【Ruby on Rails】CarrierWaveを使って本番環境からS3に画像をアップロードする方法【heroku】

gem 'fog-aws'

class ImageUploader < CarrierWave::Uploader::Base

  include CarrierWave::MiniMagick
  process resize_to_fit: [800, 800]

  #storageを「:file」から「:fog」に変更し、アップロードにfogを使う指定をする
  storage :fog

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

require 'carrierwave/storage/abstract'
require 'carrierwave/storage/file'
require 'carrierwave/storage/fog'

CarrierWave.configure do |config|
  config.storage = :fog
  config.fog_provider = 'fog/aws'
  config.fog_credentials = {
    provider: 'AWS',
    aws_access_key_id: Rails.application.credentials.aws[:access_key_id],#AWSのaccess_key_id
    aws_secret_access_key: Rails.application.credentials.aws[:secret_access_key],#AWSのsecret_access_key
    region: 'ap-northeast-1' #アジアパシフィック（東京）を表している
  }

  config.fog_directory  = 'ここにバケット名を入れる'
  config.asset_host = 'https://s3-ap-northeast-1.amazonaws.com/ここにバケット名を入れる'
end

$ EDITOR=vim rails credentials:edit

aws:
  access_key_id: 'ここに値をコピー'
  secret_access_key: 'ここに値をコピー'

# Used as the base secret for all MessageVerifiers in Rails, including the one protecting cookies.
secret_key_base: cb2965bfebd75267542611a74ab612b9754f98・・・・・

前略

aws_access_key_id: Rails.application.credentials.aws[:access_key_id],#AWSのaccess_key_id
aws_secret_access_key: Rails.application.credentials.aws[:secret_access_key],#AWSのsecret_access_key

後略

 #もともと「false」になっているので「true」にする
  config.require_master_key = true

$ git push heroku master

$ heroku open