Cài đặt ActiveStorage

rails active_storage:install

rake db:migrate

gem "image_processing"

has_one_attached :image

def article_params
  params.require(:article).permit(:image)
end

= f.label :image
= f.file_field :image, accept: "image/png, image/jpg, image/jpeg, image/gif"

- if @article.image.attached?
  = image_tag @article.image.variant(resize: "640x480^", crop:"640x480+0+0", gravity: :center).processed

Một vài method cơ bản

article.image.attached?

rails_blob_path(article.image, disposition: "attachment")

article.image.purge

Thiết lập để dùng trên Production

gem "aws-sdk-s3", require: false

amazon:
  service: S3
  access_key_id: <%= ENV["AWS_ACCESS_KEY_ID"] %>
  secret_access_key: <%= ENV["AWS_SECRET_ACCESS_KEY"] %>
  region: ap-northeast-1
  bucket: <%= ENV["AWS_BUCKET"] %>

config.active_storage.service = :amazon