class CreateUploadFile < ActiveRecord::Migration
  def self.up
    create_table :upload_files do |t|
      # 所有都用
      t.string  :content_type
      t.string  :filename    
      t.integer :size
      # image 用
      t.integer :width
      t.integer :height
      # thumbnail 用
      t.string  :thumbnail 
      t.integer :parent_id
      # 如果揀用database儲file
      t.references :db_file
    end
  end
  def self.down
    drop_table :upload_files
  end
end

#如果用database儲
def CreateDbFiles < ActiveRecord::Migration
  def self.up
    create_table :db_files do
      t.binary :data
    end
  end
  def self.down
    drop_table :db_files
  end
end