```ruby
class PageAttachment < ActiveRecord::Base
  acts_as_list :scope => :page_id
  has_attachment :storage => :file_system,
                 :thumbnails => defined?(PAGE_ATTACHMENT_SIZES) && PAGE_ATTACHMENT_SIZES || {:icon => '50x50>'},
                 :max_size => 10.megabytes
  validates_as_attachment

  belongs_to :created_by,
             :class_name => 'User',
             :foreign_key => 'created_by'
  belongs_to :updated_by,
             :class_name => 'User',
             :foreign_key => 'updated_by'
  belongs_to :page

  def short_filename(wanted_length = 15, suffix = ' ...')
          (self.filename.length > wanted_length) ? (self.filename[0,(wanted_length - suffix.length)] + suffix) : self.filename
  end

  def short_title(wanted_length = 15, suffix = ' ...')
          (self.title.length > wanted_length) ? (self.title[0,(wanted_length - suffix.length)] + suffix) : self.title
  end

  def short_description(wanted_length = 15, suffix = ' ...')
          (self.description.length > wanted_length) ? (self.description[0,(wanted_length - suffix.length)] + suffix) : self.description
  end

end
```

Fix title/description update (previously unable to update those information on available attachments). Make :title and :description attributes accessible
user
```ruby
class PageAttachment < ActiveRecord::Base
  acts_as_list :scope => :page_id
  has_attachment :storage => :file_system,
                 :thumbnails => defined?(PAGE_ATTACHMENT_SIZES) && PAGE_ATTACHMENT_SIZES || {:icon => '50x50>'},
                 :max_size => 10.megabytes
  validates_as_attachment

  belongs_to :created_by,
             :class_name => 'User',
             :foreign_key => 'created_by'
  belongs_to :updated_by,
             :class_name => 'User',
             :foreign_key => 'updated_by'
  belongs_to :page
  
  attr_accessible :title, :description

  def short_filename(wanted_length = 15, suffix = ' ...')
          (self.filename.length > wanted_length) ? (self.filename[0,(wanted_length - suffix.length)] + suffix) : self.filename
  end

  def short_title(wanted_length = 15, suffix = ' ...')
          (self.title.length > wanted_length) ? (self.title[0,(wanted_length - suffix.length)] + suffix) : self.title
  end

  def short_description(wanted_length = 15, suffix = ' ...')
          (self.description.length > wanted_length) ? (self.description[0,(wanted_length - suffix.length)] + suffix) : self.description
  end

end
```
assistant