file.rb

    property :id, Serial
    property :name, String, required: true
    property :size, Integer
    property :type, String
    property :content, Binary, lazy: true, length: 1..209715200
    property :uri, URI
    property :created_at, DateTime
    property :updated_at, DateTime

    belongs_to :folder, model: Filemanager::Folder

    before :save, :create_uri

    def self.copy( files, folder_id )
      files.each do |file|
        _content = file.content.force_encoding 'binary'
        create({
          name: file.name,
          size: file.size,
          type: file.type,
          content: _content,
          folder_id: folder_id
        })
      end
    end

    def self.from_uploaded( files, folder )
      success, errors = [], []

      files.to_a.each do |file|
        size = file[:tempfile].size
        content = file[:tempfile].read(size)
        unless content.bytesize == size
          raise "truncation"
        end
        f = new({
          name: file[:filename],
          type: file[:type],
          content: content,
          size: size,
          folder: folder
        })
        
        file[:tempfile].delete

        if f.valid?
          f.save
          attrs = f.attributes
          attrs.delete( :content )
          success.push( attr )
        else
          errors.push( { file: f.name, 
                         errors: f.errors.full_messages } )
        end # if

      end # files each

      { success: success, errors: errors }
    end

    def create_uri
      ancestors = folder.ancestors 
      ancestors.shift # remove root
      _uri = ancestors.map{ |a| a.name.strip }.join('/')
      self.uri = "#{SLUG}#{_uri}/#{name}".downcase.gsub(/[^\w\/\.]/, '_')
    end