save base64 image

create-upload-file.rb

# -*- coding: utf-8 -*-
# entities的数据结构, [{name: name, image: <File:image>}, ...]
class CreateEntitySet < Dun::Activity
  data_reader :entities, :contest

  def call
    entities.map {|e|
      entity = Entity.new
      
      entity.sn         = SecureRandom.uuid
      entity.name       = e[:name]
      entity.image      = create_upload_file e[:image]
      entity.contest_id = contest.id
      entity.itype      = contest.itype
      entity.save
      
      entity
    }
  end

  private

  def create_upload_file(image)
    if image.is_a? String
      tempfile = Tempfile.new("fileupload")
      tempfile.binmode
      tempfile.write(Base64.decode64 image)
      ActionDispatch::Http::UploadedFile.new(tempfile: tempfile, filename: SecureRandom.urlsafe_base64)
    else
      image
    end
  end
  
end