Medium Article - Custom Backend Video Model

video.rb

class Video < ApplicationRecord
  UPLOAD_BUCKET = "medium-article-#{Rails.env}-videos"
  belongs_to :user, optional: true
  before_save :assign_random_key
  
  def original_url
    "https://#{ENV['CLOUDFRONT_DOMAIN']}/#{key}"
  end
  def low_res_url
    return unless low_res_key
    
    "https://#{ENV['CLOUDFRONT_DOMAIN']}/#{low_res_key}"
  end
  def upload_url
    presigner = Aws::S3::Presigner.new
    presigner.presigned_url(
      :put_object,
      bucket: UPLOAD_BUCKET,
      key: key,
      use_accelerate_endpoint: true,
      expires_in: 900
    )
  end
  private
  
  def assign_random_key
    return if key.present?
    
    self.key = "uploads/#{user_id}/#{SecureRandom.uuid}"
  end
end