사이냅 에디터 문서
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  • 아래의 예제는 ruby는 '2.5.1', rails는 '5.2.3' 버전을 기준으로 작성되었습니다.
  • 파일 업로드를 위해 gem에서 제공하는 'carrierwave'라는 업로더를 사용하였습니다.
    • 설치 방법 1
      • gem install carrierwave
    • 설치 방법 2
      • Gemfile에 gem 'carrierwave' 입력
      • bundle install

1. 샘플 코드

  • 이미지, 동영상, 파일 업로드 기능과 임포트 기능을 수행하기 위한 MVC를 생성합니다.
  • 이미지, 동영상, 파일 업로드는 '/upload' API를, 그리고 임포트는 '/import' API를 사용한다는 가정하에 작성되었습니다.

1.1 파일 업로더 생성

> rails generate uploader File


./app/uploaders/file_uploader.rb
Class FileUploader < CarrierWave::Uploader::Base
# Include RMagick or MiniMagick support:
  # include CarrierWave::RMagick
  # include CarrierWave::MiniMagick


  # Choose what kind of storage to use for this uploader:
  storage :file
  # 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
    "uploads/"
  end

  # Provide a default URL as a default if there hasn't been a file uploaded:
  # def default_url(*args)
  #   # For Rails 3.1+ asset pipeline compatibility:
  #   # ActionController::Base.helpers.asset_path("fallback/" + [version_name, "default.png"].compact.join('_'))
  #
  #   "/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

  # Create different versions of your uploaded files:
  # version :thumb do
  #   process resize_to_fit: [50, 50]
  # end

  # Add a white list of extensions which are allowed to be uploaded.
  # For images you might use something like this:
  # def extension_whitelist
  #   %w(jpg jpeg gif png)
  # end

  # Override the filename of the uploaded files:
  # Avoid using model.id or version_name here, see uploader/store.rb for details.
  def filename
    "#{secure_token}.#{file.extension}" if original_filename.present?
  end

  protected
  def secure_token
    var = :"@#{mounted_as}_secure_token"
    model.instance_variable_get(var) or model.instance_variable_set(var, SecureRandom.uuid)
  end
end 

1.2 모델 생성

> rails generate model UploadFile


./app/models/upload_file.rb
class UploadFile < ApplicationRecord
	mount_uploader :file, FileUploader
end

1.3 컨트롤러 생성

> rails generate controller UploadFile


./app/controller/upload_file_controller.rb
class UploadFileController < ApplicationController
	skip_before_action :verify_authenticity_token # csrf_token
  
	def upload
		...
	end


	def import
		...
	end
end

1.4 데이터베이스 마이그레이션

# UploadFile에 파일을 담을 'file' 필드 추가
> rails generate migration AddFileToUploadFile file:string 
> rake db:migrate

1.5 라우터 연결

./config/routes.rb
Rails.application.routes.draw do
	...
	resource :upload_file #라우터와 컨트롤러 연결
	...
end
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